diff --git a/src/charts/chart.js b/src/charts/chart.js
index 7a43b08..09b8fd8 100644
--- a/src/charts/chart.js
+++ b/src/charts/chart.js
@@ -1,6 +1,7 @@
 import {useChartOrderStore} from "@/orderbuild.js";
 import {invokeCallbacks, prototype} from "@/common.js";
 import {DataFeed, initFeeDropdown, lookupSymbol} from "@/charts/datafeed.js";
+import {intervalToSeconds} from "@/misc.js";
 
 export let widget = null
 export let chart = null
@@ -24,6 +25,11 @@ function changeSymbol(symbol) {
 }
 
 
+function changeInterval(interval, _timeframe) {
+    useChartOrderStore().intervalSecs = intervalToSeconds(interval)
+}
+
+
 /*  TradingView event keystrings
 const subscribeEvents = [
     'toggle_sidebar', 'indicators_dialog', 'toggle_header', 'edit_object_dialog', 'chart_load_requested',
@@ -69,8 +75,10 @@ function initChart() {
     console.log('init chart')
     chart = widget.activeChart()
     chart.crossHairMoved().subscribe(null, (point)=>setTimeout(()=>handleCrosshairMovement(point),0) )
-    chart.onSymbolChanged().subscribe(null, changeSymbol);
+    chart.onSymbolChanged().subscribe(null, changeSymbol)
+    chart.onIntervalChanged().subscribe(null, changeInterval)
     changeSymbol(chart.symbolExt())
+    changeInterval(widget.symbolInterval().interval)
     useChartOrderStore().chartReady = true
     console.log('chart ready')
 }
@@ -242,7 +250,6 @@ function drawingEventWorker() {
         const queue = drawingEventQueue
         drawingEventQueue = []
         propsEvents = {}
-        // console.log('events locked', queue)
         for (const [id, event] of queue) {
             if (event === 'properties_changed')
                 propsEvents[id] = event
@@ -259,8 +266,18 @@ function drawingEventWorker() {
 }
 
 function doHandleDrawingEvent(id, event) {
-    // console.log('drawing event', id, event)
-    const shape = event === 'remove' ? null : chart.getShapeById(id);
+    console.log('drawing event', id, event)
+    let shape
+    if (event==='remove')
+        shape = null
+    else {
+        try {
+            shape = chart.getShapeById(id)
+        }
+        catch {
+            return
+        }
+    }
     if (event === 'create') {
         const co = useChartOrderStore();
         const callbacks = co.drawingCallbacks
diff --git a/src/charts/shape.js b/src/charts/shape.js
index 8422b7e..c659989 100644
--- a/src/charts/shape.js
+++ b/src/charts/shape.js
@@ -3,6 +3,8 @@
 import {invokeCallback, mixin} from "@/common.js";
 import {chart, createShape, deleteShapeId, dragging, draggingShapeIds, drawShape, widget} from "@/charts/chart.js";
 import {unique} from "@/misc.js";
+import {useChartOrderStore} from "@/orderbuild.js";
+import model from "color";
 
 
 //
@@ -37,34 +39,96 @@ export const ShapeType = {
 }
 
 
-class Shape {
-    constructor(type, model={}, onModel=null, onDelete=null, props=null) {
+export class Shape {
+
+    constructor(type, onModel=null, onDelete=null, props=null) {
         // the Shape object manages synchronizing internal data with a corresponding TradingView shape
+
+        // each shape in the class hierarchy overrides setModel() to cause effects in TradingView
+        // TV callbacks are returned to the on*() handlers, primarily onPoints() and onProps(). Handlers
+        // of TV callbacks should call updateModel() with just the kv's they want to change. Any changes
+        // are then passed onto the onModel() callback.
+
+        // the model object has various attributes defined by each shape subclass.  each subclass's constructor
+        // must call setModel(model) after first calling super.constructor() and optionally declaring any model
+        // defaults on this.model.
+
+        // Shape: {
+        //   lineColor, textColor, color, // lineColor and textColor default to color
+        // }
+
+        this.debug = false
         this.id = null // TradingView shapeId, or null if no TV shape created yet (drawing mode)
         this.type = type  // ShapeType
-        this.model = model  // subclass-specific
-        this.points = null
-        this.points = this.pointsFromModel()
-        // console.log('construct points', this.points)
-        this.props = props === null ? this.propsFromModel() : mixin(props, this.propsFromModel())
+        this.model = {}  // set to nothing at first
+        this.ourPoints = null
+        this.tvPoints = null
+        this.ourProps = {}
+        if (props !== null)
+            this.ourProps = mixin(props, this.ourProps)
+        this.tvProps = null
         if (onModel !== null)
             this.onModel = onModel
         if (onDelete !== null )
             this.onDelete = onDelete
-        this.create()
+
+        // Model values handled by this base class
+        this.model.color = null
+        this.model.lineColor = null
+        this.model.textColor = null
+
     }
 
     //
     // primary interface methods
     //
 
+    setModel(model) {
+        if (model.textColor || model.lineColor) {
+            if (model.textColor)
+                this.model.textColor = model.textColor
+            if (model.lineColor)
+                this.model.lineColor = model.lineColor
+            this.setProps(this.colorProps())
+        }
+        // todo text
+    }
+
+    onModel(model, changedKeys) {}  // model was changed by a TradingView user action
+
+    updateModel(changes) {
+        if (this.debug) console.log('updateModel', this.id, changes)
+        const changedKeys = []
+        for (const k of Object.keys(changes)) {
+            if( changes[k] !== undefined && changes[k] !== this.model[k] ) {
+                changedKeys.push(k)
+                this.model[k] = changes[k]
+            }
+        }
+        if (changedKeys.length)
+            this.onModel(this.model, changedKeys)
+    }
+
+    colorProps() {
+        if (!this.model.color&&!this.model.lineColor&&!this.model.textColor) return null
+        const o = {}
+        const p = this.type.drawingProp
+        const lc = this.model.lineColor ? this.model.lineColor : this.model.color;
+        const tc = this.model.textColor ? this.model.textColor : this.model.color;
+        if (lc)
+            o[p+".linecolor"] = lc
+        if (tc)
+            o[p+".textcolor"] = tc
+        return o
+    }
+
     draw() {
         // have the user draw this shape
-        console.log(`draw ${this.type.name}`, this.model)
+        if (this.debug) console.log(`draw ${this.type.name}`, this.model)
         if (this.id)
             throw Error(`Shape already exists ${this.id}`)
         const or = this.drawingOverrides();
-        // console.log('drawing overrides', or)
+        // if (this.debug) console.log('drawing overrides', or)
         widget.applyOverrides(or)
         drawShape(this.type, new ShapeTVCallbacks(this))
     }
@@ -72,30 +136,28 @@ class Shape {
     // return an object with property defaults, e.g. { "linetoolhorzline.linecolor": "#7f11e0" }
     // https://www.tradingview.com/charting-library-docs/latest/api/modules/Charting_Library#drawingoverrides
     drawingOverrides() {
-        if (this.model.color===null) return null
-        const o = {}
-        const p = this.type.drawingProp
-        o[p+".linecolor"] = this.model.color
-        o[p+".textcolor"] = this.model.color
-        return o
+        return this.colorProps()
     }
 
     create() {
         if (this.id !== null) return
         // programatically create the shape using the current this.points
-        if( this.points && this.points.length ) {
+        if( this.ourPoints && this.ourPoints.length ) {
             this.doCreate()
         }
     }
 
     doCreate() {
-        createShape(this.type, this.points, {overrides:this.props}, new ShapeTVCallbacks(this))
+        // createShape(this.type, this.points, {overrides:this.props}, new ShapeTVCallbacks(this))
+        this.tvPoints = [...this.ourPoints]
+        this.id = createShape(this.type, this.ourPoints, {overrides:this.ourProps}, new ShapeTVCallbacks(this))
+        if (this.debug) console.log('created', this.type.name, this.ourPoints, this.id)
     }
 
     createOrDraw() {
         if(this.id) return
-        if(this.points && this.points.length)
-            this.doCreate(this.points)
+        if(this.ourPoints && this.ourPoints.length)
+            this.doCreate(this.ourPoints)
         else
             this.draw()
     }
@@ -106,36 +168,25 @@ class Shape {
     }
 
 
-    setModel(model, props=null) {
-        for( const [k,v] of Object.entries(model))
-            this.model[k] = v
-        this.setPointsIfDirty(this.pointsFromModel());
-        let p
-        const mp = this.propsFromModel();
-        if (props===null) {
-            p = mp
-            if (p===null)
-                return
-        }
-        else if (mp !== null)
-            p = mixin(props, mp)
-        this.setPropsIfDirty(p)
-    }
-
-
     setPoints(points) {
-        this.points = points
+        // setting points to null will delete the shape from the chart. setting points to a valid value will cause the
+        // shape to be drawn.
+        if (this.debug) console.log('setPoints', points)
+        this.ourPoints = points
         if (points === null || !points.length)
             this.delete()
         else {
             if (this.id === null)
                 this.doCreate()
-            else {
+            else if (dirtyPoints(this.tvPoints, points)) {
                 const s = this.tvShape();
-                if (!dragging) {
+                if (this.debug) console.log('adjusting tv points', s, this.tvPoints, points)
+                if (!this.beingDragged()) {
+                    if (this.debug) console.log('not dragging.  use setPoints.')
                     s.setPoints(points)
                 }
                 else {
+                    if (this.debug) console.log('dragging.  use QUIET setPoints.')
                     // quiet setPoints doesn't disturb tool editing mode
                     const i = s._pointsConverter.apiPointsToDataSource(points)
                     // s._model.startChangingLinetool(this._source)
@@ -147,67 +198,39 @@ class Shape {
         }
     }
 
-
-    setPointsIfDirty(points) {
-        if (dirtyPoints(this.points, points))
-            this.setPoints(points)
-    }
-
+    onPoints(points) {} // the control points of an existing shape were changed
 
     setProps(props) {
-        if(this.id)
-            this.tvShape().setProperties(props)
+        if (!props || Object.keys(props).length===0) return
+        if (this.debug) console.log('setProps', props)
+        this.ourProps = mixin(props, this.ourProps)
+        if(this.id) {
+            const p = dirtyItems(this.tvProps, props)
+            this.tvProps = this.tvProps === null ? p : mixin(p, this.tvProps)
+            this.tvShape().setProperties(p)
+        }
     }
 
-
-    setPropsIfDirty(props) {
-        // console.log('dirtyProps', this.props, props, dirtyProps(this.props, props))
-        if( dirtyProps(this.props, props) )
-            this.setProps(props)
+    onProps(props) {  // the display properties of an existing shape were changed
+        this.updateModel({lineColor:props.linecolor, textColor:props.textcolor})
     }
 
-
     beingDragged() {
         return draggingShapeIds.indexOf(this.id) !== -1
     }
 
 
     delete() {
-        // console.log('shape.delete', this.id)
+        if (this.debug) console.log('shape.delete', this.id)
+        this.ourPoints = null
         if (this.id === null) return
-        this.lock++
-        try {
-            deleteShapeId(this.id)
-            this.id = null
-        } finally {
-            this.lock--
-        }
+        deleteShapeId(this.id)
+        this.id = null
     }
 
 
     //
-    // Model synchronization
-    //
-
-    onDirtyModel(toModel) {
-        const old = {...this.model}
-        toModel.call(this)
-        const dirty = dirtyKeys(old, this.model)
-        // console.log('onDirtyModel', old, this.model, dirty)
-        if (dirty.length)
-            this.onModel(this.model)
-    }
-
-    pointsFromModel() {return null}
-    pointsToModel() {} // set the model using this.points
-    propsFromModel() {return null}
-    propsToModel() {} // set the model using this.props
-
-    onModel(model) {} // called whenever points or props updates the model dictionary
-
-
-    //
-    // Overridable shape callbacks
+    // Overridable shape callbacks initiated by TradingView
     //
 
     onDraw() {}  // start drawing a new shape for the builder
@@ -215,8 +238,6 @@ class Shape {
     onUndraw() {}  // drawing was canceled by clicking on a different tool
     onAddPoint() {}  // the user clicked a point while drawing (that point is added to the points list)
     onCreate(points, props) {} // the user has finished creating all the control points.  drawing mode is exited and the initial shape is created.
-    onPoints(points) {} // the control points of an existing shape were changed
-    onProps(props) {}  // the display properties of an existing shape were changed
     onMove(points) {} // the shape was moved by dragging a drawing element not the control point
     onDrag(points) {}
     onHide(props) {}
@@ -226,7 +247,6 @@ class Shape {
 
 }
 
-
 function dirtyPoints(pointsA, pointsB) {
     if (pointsB===null)
         return pointsA !== null
@@ -243,21 +263,6 @@ function dirtyPoints(pointsA, pointsB) {
     return false
 }
 
-
-// B is modifying A
-function dirtyProps(propsA, propsB) {
-    if (propsB===null)
-        return propsA !== null
-    const entries = Object.entries(propsB);
-    if (propsA===null)
-        return entries.length > 0
-    for( const [k,v] of entries)
-        if ( !(k in propsA) || propsA[k] !== v )
-            return true
-    return false
-}
-
-
 // B is modifying A
 function dirtyKeys(propsA, propsB) {
     if (propsB===null)
@@ -265,7 +270,15 @@ function dirtyKeys(propsA, propsB) {
     if (propsA===null)
         return [...Object.keys(propsB)]
     const keys = unique([...Object.keys(propsA), ...Object.keys(propsB)])
-    return keys.filter((k)=> !(k in propsA) || propsA[k] !== propsB[k])
+    return keys.filter((k)=> !(k in propsA) || propsA[k] !== undefined && propsA[k] !== propsB[k])
+}
+
+
+function dirtyItems(a, b) {
+    const result = {}
+    for (const k of dirtyKeys(this.tvProps, props))
+        result[k] = props[k]
+    return result
 }
 
 
@@ -278,113 +291,173 @@ class ShapeTVCallbacks {
     }
 
     onCreate(shapeId, _tvShape, points, props) {
-        if( this.shape.id )
-            throw Error(`Created a shape ${shapeId} where one already existed ${this.shape.id}`)
-        this.shape.id = shapeId
-        if( this.shape.lock ) return
         this.creating = true
         invokeCallback(this.shape, 'onCreate', points, props)
     }
 
     onPoints(shapeId, _tvShape, points) {
-        this.shape.points = points
+        if (this.shape.debug) console.log('tvcb onPoints', points)
+        this.shape.tvPoints = points
         this.shape.onPoints(points)
-        this.shape.onDirtyModel(this.shape.pointsToModel)
     }
 
     onProps(shapeId, _tvShape, props) {
-        // console.log('onProps', props)
-        if (this.creating) {
+        // if (this.shape.debug) console.log('tvOnProps', props)
+        if (this.creating) { // todo still useful?
             this.creating = false
             return
         }
-        this.shape.props = props
+        this.shape.tvProps = props
         this.shape.onProps(props)
-        this.shape.onDirtyModel(this.shape.propsToModel)
     }
 
     onDraw() {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onDraw')
     }
 
     onRedraw() {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onRedraw')
     }
 
     onUndraw() {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onUndraw')
     }
 
     onAddPoint() {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onAddPoint')
     }
 
     onMove(_shapeId, _tvShape, points) {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onMove',points)
     }
 
     onDrag(_shapeId, _tvShape, points) {
-        if( this.shape.lock ) return
+        if (this.shape.debug) console.log('onDrag')
         invokeCallback(this.shape, 'onDrag', points)
     }
 
     onHide(_shapeId, _tvShape, props) {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onHide',props)
     }
 
     onShow(_shapeId, _tvShape, props) {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onShow',props)
     }
 
     onClick(_shapeId, _tvShape) {
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onClick')
     }
 
     onDelete(shapeId) {
         this.shape.id = null
-        if( this.shape.lock ) return
         invokeCallback(this.shape, 'onDelete', shapeId)
     }
 }
 
 
-export class HLine extends Shape {
+export class Line extends Shape {
+    onDrag(points) {
+        const s = this.tvShape();
+        if (this.debug) {
+            console.log('shape', s)
+            console.log('currentMovingPoint', s._source.currentMovingPoint())
+            console.log('startMovingPoint', s._source.startMovingPoint())
+            console.log('isBeingEdited', s._source.isBeingEdited())
+            console.log('state', s._source.state())
+        }
+    }
+}
+
+
+export class HLine extends Line {
     constructor(model, onModel=null, onDelete=null, props=null) {
         super(ShapeType.HLine, model, onModel, onDelete, props)
     }
 
-    pointsFromModel() {
-        if (this.model.price === null) return null
-        const time = this.points !== null && this.points.length > 0 ? this.points[0].time : 0
-        return [{time:time, price:this.model.price}]
+    setModel(model) {
+        if (model.price !== undefined && model.price !== this.model.price) {
+            this.model.price = model.price
+            this.setPoints([{time:0,price:this.model.price}])
+        }
     }
 
-    pointsToModel() {
-        this.model.price = this.points[0].price
+    onPoints(points) {
+        super.onPoints(points);
     }
 
-    propsFromModel() {
-        return this.model.color ? {linecolor: this.model.color} : null
+    pointsFromModel(model) {
+        if (model.price === null || model.price===undefined) return null
+        // take any time available, or 0
+        const time =
+            this.ourPoints !== null && this.ourPoints.length > 0 ? this.ourPoints[0].time :
+            this.tvPoints !== null && this.tvPoints.length > 0 ? this.tvPoints[0].time : 0
+        return [{time:time, price:model.price}]
     }
 
-    propsToModel() {this.model.color=this.props.linecolor}
-
-    onDrag(points) {
-        const s = this.tvShape();
-        console.log('shape', s)
-        console.log('currentMovingPoint', s._source.currentMovingPoint())
-        console.log('startMovingPoint', s._source.startMovingPoint())
-        console.log('isBeingEdited', s._source.isBeingEdited())
-        console.log('state',  s._source.state())
+    pointsToModel(points) {
+        return {price: this.ourPoints[0].price}
     }
 
 }
 
+
+function timeAdjustmentTooSmall(orig, newValue) {
+    // TradingView adjusts our lines to be at the start of the intervals, so
+    // we ignore deltas smaller than one interval prior
+    return newValue === undefined ||
+        orig !== null && orig !== undefined && newValue !== null &&
+        newValue < orig && orig - newValue < useChartOrderStore().intervalSecs
+}
+
+
+function ohlcStart(time) {
+    const period = useChartOrderStore().intervalSecs
+    return Math.floor(time/period) * period
+}
+
+
+export class VLine extends Line {
+    constructor(model, onModel=null, onDelete=null, props=null) {
+        super(ShapeType.VLine, onModel, onDelete, props)
+
+        // Model
+        this.model.time = null
+
+        this.setModel(model) // call setModel at the end
+    }
+
+    onPoints(points) {
+        if (this.debug) console.log('vline onPoints', this.ourPoints, points)
+        super.onPoints(points);
+        const orig = this.ourPoints && this.ourPoints.length ? this.ourPoints[0].time : null
+        if (!timeAdjustmentTooSmall(orig, points[0].time)) {
+            if (this.debug) console.log('updateModel', points[0].time)
+            this.updateModel({time: points[0].time})
+        }
+    }
+
+    setModel(model) {
+        if (this.debug) console.log('vline setModel', this.model.time, model )
+        super.setModel(model)
+        if (model.time !== undefined && model.time !== this.model.time) {
+            this.model.time = model.time
+            const time = ohlcStart(model.time);
+            if (this.debug) console.log('vline setPoints', this.id, time)
+            this.setPoints([{time, price:1}])
+        }
+    }
+
+    delete() {
+        this.model.time = null
+        super.delete()
+    }
+
+    dirtyPoints(pointsA, pointsB) {
+        const a = pointsA ? pointsA[0].time : null
+        const b = pointsB ? pointsB[0].time : null
+        const result = !timeAdjustmentTooSmall(a, b)
+        if (this.debug) console.log('vline dirty points?', a, b, result)
+        return result
+    }
+}
+
diff --git a/src/common.js b/src/common.js
index 0f5a73d..be40122 100644
--- a/src/common.js
+++ b/src/common.js
@@ -3,7 +3,7 @@ export function mixin(child, ...parents) {
     // assigned by parents order, highest priority first
     for( const parent of parents ) {
         for ( const key in parent) {
-            if (parent.hasOwnProperty(key) && !child.hasOwnProperty(key)) {
+            if (parent.hasOwnProperty(key) && !child.hasOwnProperty(key) && parent[key] !== undefined) {
                 child[key] = parent[key];
             }
         }
@@ -11,7 +11,6 @@ export function mixin(child, ...parents) {
     return child;
 }
 
-
 export function prototype(parent, child) {
     const result = Object.create(parent);
     Object.assign(result, child)
diff --git a/src/components/chart/BuilderPanel.vue b/src/components/chart/BuilderPanel.vue
index 2be65bf..40dc444 100644
--- a/src/components/chart/BuilderPanel.vue
+++ b/src/components/chart/BuilderPanel.vue
@@ -1,28 +1,65 @@
 <template>
-  <div :key="builder.id">
-    <v-card-text :color="titleColor">
-      <slot name="title"><span>Unimplemented</span></slot>
-    </v-card-text>
-    <v-card-text>
-      <slot name="text">
-        Unimplemented builder panel
-      </slot>
-      <div><v-btn variant="tonal" color="error" @click="co.removeBuilder(builder)" prepend-icon="mdi-delete">DELETE</v-btn></div>
-    </v-card-text>
-  </div>
+  <row-bar :color="builder.color">
+    <color-band :color="builder.color"/>
+    <slot/>
+    <div class="align-self-center">
+      <v-menu>
+        <template v-slot:activator="{ props }">
+          <v-btn variant="plain" v-bind="props" icon="mdi-dots-vertical"/>
+        </template>
+        <v-list>
+<!--          <v-list-subheader :title="'Limit '+ (lineAPrice?lineAPrice.toPrecision(5):'')"/>-->
+          <v-list-item title="Delete" key="withdraw" value="withdraw" prepend-icon="mdi-delete" color="red"
+                       @click="deleteMyBuilder"/>
+        </v-list>
+      </v-menu>
+    </div>
+  </row-bar>
 </template>
 
 <script setup>
-import {useChartOrderStore} from "@/orderbuild.js";
-import {computed} from "vue";
+import {builderFuncs, deleteBuilder, useChartOrderStore} from "@/orderbuild.js";
+import ColorBand from "@/components/chart/ColorBand.vue";
+import RowBar from "@/components/chart/RowBar.vue";
+import {onBeforeUnmount, onMounted, onUnmounted, onUpdated, watchEffect} from "vue";
 
-const props = defineProps(['builder', 'color', 'colorTag'])
+const props = defineProps({
+  order: Object,
+  builder: Object,
+  buildTranches: {type: Function},
+  adjustShapes: {type: Function, default: null},
+  deleteShapes: {type: Function, default: null},
+})
+const emit = defineEmits(['update:builder'])
 const co = useChartOrderStore()
 
-const titleColor = computed(()=>props.color ? props.color : props.colorTag ? props.builder.props[props.colorTag]?.linecolor : props.builder.props.a.linecolor )
+
+let lastId = props.builder.id
+builderFuncs[props.builder.id] = props.buildTranches
+onUpdated(()=>{
+  if (lastId !== props.builder.id ) {
+    delete builderFuncs[lastId]
+    builderFuncs[props.builder.id] = props.buildTranches
+    lastId = props.builder.id
+  }
+})
+onUnmounted(() => delete builderFuncs[lastId])
+
+if (props.adjustShapes) {
+  watchEffect(props.adjustShapes)
+  onMounted(props.adjustShapes)
+}
+
+if (props.deleteShapes)
+  onBeforeUnmount(props.deleteShapes)
+
+function deleteMyBuilder() {
+  deleteBuilder(props.order, props.builder);
+}
+
 
 </script>
 
 <style scoped lang="scss">
 
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/chart/ChartOrder.vue b/src/components/chart/ChartOrder.vue
index d3ac233..01936bd 100644
--- a/src/components/chart/ChartOrder.vue
+++ b/src/components/chart/ChartOrder.vue
@@ -30,7 +30,7 @@
       <div class="my-3">
         <div v-if="order.builders.length===0">  <!--todo remove gralpha limitation of one builder-->
           <span :style="colorStyle" class="ma-3">Add condition:</span>
-          <!--    <v-btn variant="flat" prepend-icon="mdi-clock-outline" @click="build('DCABuilder')">DCA</v-btn>-->
+          <v-btn :color="color" variant="text" prepend-icon="mdi-clock-outline" @click="build(order,'DCABuilder')">DCA</v-btn>
           <v-btn :color="color" variant="text" prepend-icon="mdi-ray-vertex" @click="build(order,'LimitBuilder')">Limit</v-btn>
       <!--    <v-btn variant="flat" prepend-icon="mdi-vector-line">Line</v-btn>-->
           <!--
diff --git a/src/components/chart/DCABuilder.vue b/src/components/chart/DCABuilder.vue
index 37c6dd1..bc49dd7 100644
--- a/src/components/chart/DCABuilder.vue
+++ b/src/components/chart/DCABuilder.vue
@@ -1,33 +1,158 @@
 <template>
-  <builder-panel :builder="builder">
-    <template v-slot:title>
-      <span>DCA</span>
-      <span v-if="!builder.points">Draw your timeframe on the chart!</span>
-    </template>
-    <template v-slot:text>
-      <input type="number" min="1" max="2">
-    </template>
-  </builder-panel>
+  <rung-builder name='DCA' :order="order" :builder="builder"
+                v-model:value-a="absTimeA" v-model:value-b="absTimeB" :mode="1" :shape="VLine"
+                :get-model-value="getModelValue" :set-model-value="setModelValue" :set-values="setValues"
+                :std-width="stdWidth" :build-tranches="buildTranches">
+    <v-list style="background-color: inherit">
+      <v-list-item v-for="t in absoluteTimes">{{t}}</v-list-item>
+    </v-list>
+  </rung-builder>
 </template>
 
 <script setup>
-import BuilderPanel from "@/components/chart/BuilderPanel.vue";
-import {drawShape, ShapeCallback, VerboseCallback} from "@/charts/chart.js";
-import {prototype} from "@/common.js";
-import {ShapeType} from "@/charts/shape.js";
+import {builderDefaults, MIN_EXECUTION_TIME, useChartOrderStore} from "@/orderbuild.js";
+import {VLine} from "@/charts/shape.js";
+import {sideColor} from "@/misc.js";
+import {useTheme} from "vuetify";
+import {useOrderStore, useStore} from "@/store/store.js";
+import {DISTANT_FUTURE, MAX_FRACTION, newTranche} from "@/blockchain/orderlib.js";
+import RungBuilder from "@/components/chart/RungBuilder.vue";
+import {computed, ref} from "vue";
 
-const props = defineProps(['builder'])
+const s = useStore()
+const os = useOrderStore()
+const co = useChartOrderStore()
+const theme = useTheme().current
+const props = defineProps(['order', 'builder'])
 
-const DCAArtist = prototype(VerboseCallback, {
-  onDraw(widget, chart) { console.log('dca start draw') },
-  onCreate(widget, chart) { console.log('dca start draw') },
+const stdWidth = computed(()=>10 * co.intervalSecs)
+
+function computeDefaultColor() {
+  const index = props.order.builders.indexOf(props.builder)
+  return sideColor(props.order.buy, index)
+}
+
+const defaultColor = computeDefaultColor()
+
+// Fields must be defined in order to be reactive
+builderDefaults(props.builder, {
+  timeA: s.clock, // todo 0
+  timeB: null,
+  // relative: true,
+  relative: false, // todo
+  rungs: 1,
+  skew: 0,
+  color: defaultColor,
 })
 
-drawShape(ShapeType.VLine, prototype(DCAArtist, {}))
+const rawTimes = ref([])
+const times = computed(()=>rawTimes.value.map((t)=>Math.round(t)))
+const endTimes = computed(()=>{
+  if (props.builder.rungs === 1)
+    return DISTANT_FUTURE
+  const ts = times.value
+  const window = Math.max(MIN_EXECUTION_TIME, Math.floor((ts[ts.length-1]-ts[0])/props.builder.rungs))
+  return ts.map((t)=>t+window)
+})
+const absoluteTimes = computed(()=>{
+  console.log('absoluteTimes', props.builder.relative, times.value)
+  if (!props.builder.relative)
+    return times.value
+  const now = s.clock
+  return times.value.map((t)=>now+t)
+})
 
+const absTimeA = computed({
+  get() {
+    let result = props.builder.timeA
+    if (props.builder.relative)
+      result += s.clock
+    console.log('absTimeA', result)
+    return result
+  },
+  set(v) {
+    console.log('set absTimeA', props.builder.timeA, v)
+    if (props.builder.relative)
+      v -= s.clock
+    props.builder.timeA = v
+    console.log('absTimeA=',props.builder.timeA)
+  }
+})
+const absTimeB = computed({
+  get() {
+    let result = props.builder.timeB
+    if (props.builder.relative)
+      result += s.clock
+    console.log('absTimeB', result)
+    return result
+  },
+  set(v) {
+    console.log('set absTimeB', props.builder.timeB, v)
+    if ( v !== null && props.builder.relative )
+      v -= s.clock
+    props.builder.timeB = v
+    console.log('absTimeB=',props.builder.timeB)
+  }
+})
+
+function buildTranches() {
+  const order = props.order
+  const builder = props.builder
+  const tranches = []
+
+  console.log('buildTranches', builder, order, tranches)
+  const ts = times.value
+  const ets = endTimes.value
+  const ws = weights.value
+  for(let i=0; i<ts.length; i++) {
+    const t = newTranche({
+      fraction: ws[i] * MAX_FRACTION,
+      startTime: ts[i],
+      endTime: ets[i],
+    })
+    tranches.push(t)
+  }
+  return tranches
+}
+
+
+function getModelValue(model) {
+  if(!model) {
+    console.log('getModelValue', model)
+    return null
+  }
+  return model.time
+}
+
+function setModelValue(model, value) {
+  console.log('DCA set model value', model, value)
+  const v = value === null ? null : props.builder.relative ? s.clock + Math.round(value) : Math.round(value)
+  if (model.time !== v) {
+    console.log('DCA do set time', v)
+    model.time = v
+  }
+}
+
+function setValues(values) {
+  if (!props.builder.relative)
+    rawTimes.value = values
+  else {
+    const now = s.clock
+    const vs = []
+    for (let i = 0; i < values.length; i++)
+      vs.push(values[i] - now)
+    rawTimes.value = vs
+  }
+}
+
+function valueFromPoints(points) {
+  const result = points[0].time;
+  console.log('valueFromPoints', points, result);
+  return result
+}
 
 </script>
 
 <style scoped lang="scss">
+</style>
 
-</style>
\ No newline at end of file
diff --git a/src/components/chart/LimitBuilder.vue b/src/components/chart/LimitBuilder.vue
index 0d0b4a6..ee0d48f 100644
--- a/src/components/chart/LimitBuilder.vue
+++ b/src/components/chart/LimitBuilder.vue
@@ -75,10 +75,10 @@
 <script setup>
 import {computed, onBeforeUnmount, onMounted, onUnmounted, onUpdated, watch, watchEffect} from "vue";
 import {cancelDrawing, chart} from "@/charts/chart.js";
-import {applyLine2, builderFuncs, useChartOrderStore} from "@/orderbuild.js";
+import {applyLine2, builderDefaults, builderFuncs, useChartOrderStore} from "@/orderbuild.js";
 import Color from "color";
 import {HLine} from "@/charts/shape.js";
-import {builderDefaults, lightenColor2, lineColor} from "@/misc.js";
+import {lightenColor2, sideColor} from "@/misc.js";
 import {useTheme} from "vuetify";
 import {useOrderStore} from "@/store/store.js";
 import RowBar from "@/components/chart/RowBar.vue";
@@ -93,15 +93,13 @@ const emit = defineEmits(['update:builder'])
 
 function computeDefaultColor() {
   const index = props.order.builders.indexOf(props.builder)
-  return lineColor(props.order.buy, index)
+  return sideColor(props.order.buy, index)
 }
 
 const defaultColor = computeDefaultColor()
 
 // Fields must be defined in order to be reactive
-builderDefaults(props, emit, {
-  valid: false,
-  allocation: 1.0,
+builderDefaults(props.builder, {
   start: null, // todo
   end: null, // todo
   priceA: null,
diff --git a/src/components/chart/MarketBuilder.vue b/src/components/chart/MarketBuilder.vue
index a3e4763..601e1b7 100644
--- a/src/components/chart/MarketBuilder.vue
+++ b/src/components/chart/MarketBuilder.vue
@@ -18,11 +18,8 @@
 </template>
 
 <script setup>
-import {builderFuncs, useChartOrderStore} from "@/orderbuild.js";
-import {builderDefaults} from "@/misc.js";
-import {useOrderStore} from "@/store/store.js";
+import {builderDefaults, builderFuncs, useChartOrderStore} from "@/orderbuild.js";
 import {computed, onMounted, onUnmounted} from "vue";
-import RowBar from "@/components/chart/RowBar.vue";
 import {newTranche} from "@/blockchain/orderlib.js";
 
 const co = useChartOrderStore()
@@ -30,7 +27,8 @@ const props = defineProps(['order', 'builder'])
 const emit = defineEmits(['update:builder'])
 
 // Fields must be defined in order to be reactive
-builderDefaults(props, emit, {valid: true, slippage: 0.10,})
+builderDefaults(props.builder, {valid: true, slippage: 0.10,})
+
 const slippage = computed({
   get() {console.log('slip',props.builder,props.builder.slippage); return props.builder.slippage},
   set(v) {props.builder.slippage=v; emit('update:builder', props.builder)}
diff --git a/src/components/chart/RungBuilder.vue b/src/components/chart/RungBuilder.vue
new file mode 100644
index 0000000..bf3f6cf
--- /dev/null
+++ b/src/components/chart/RungBuilder.vue
@@ -0,0 +1,352 @@
+<template>
+  <builder-panel :order="order" :builder="builder" :build-tranches="buildTranches"
+                 :adjust-shapes="adjustShapes" :delete-shapes="deleteShapes">
+    <div style="min-width: 3em; font-size: larger" :style="colorStyle" class="align-self-start ml-2 pt-3">{{ name }}
+    </div>
+    <div>
+      <v-text-field type="number" v-model="rungs"
+                    density="compact" hide-details class="mx-1 my-2" variant="outlined"
+                    label="Rungs"
+                    :color="color" :base-color="color" min="1"
+                    :disabled="valueA===null"
+                    style="width: 4.5em;"
+      />
+    </div>
+
+    <slot/>
+
+    <div v-if="co.drawing" class="d-flex align-center pl-3">
+      <v-icon icon="mdi-chat-alert-outline" color="grey" class="mr-1"/>
+      Click the chart!
+    </div>
+    <div v-if="rungs>1" class="mx-2 d-flex align-center">
+      <v-slider v-if="rungs>1" direction="vertical" min="-100" max="100" v-model="skew100"
+                class="no-slider-bg ml-2 mr-4" hide-details/>
+      <v-text-field type="number" v-model="skew100" min="-100" max="100"
+                    density="compact" hide-details variant="outlined" label="Skew" step="5"
+                    :color="color" :base-color="color">
+        <template v-slot:prepend>
+          <v-btn icon="mdi-scale-balance" variant="plain" @click="builder.skew=0" :color="color"/>
+        </template>
+      </v-text-field>
+    </div>
+  </builder-panel>
+</template>
+
+<script setup>
+import BuilderPanel from "@/components/chart/BuilderPanel.vue";
+import {useOrderStore} from "@/store/store.js";
+import {allocationText, deleteBuilder, linearWeights, useChartOrderStore, weightColors} from "@/orderbuild.js";
+import {useTheme} from "vuetify";
+import {linspace, sideColor} from "@/misc.js";
+import {computed, watchEffect} from "vue";
+import Color from "color";
+import {cancelDrawing} from "@/charts/chart.js";
+
+const os = useOrderStore()
+const co = useChartOrderStore()
+const theme = useTheme().current
+const valueA = defineModel('valueA')
+const valueB = defineModel('valueB')
+const props = defineProps({
+  name: String,
+  order: Object,
+  builder: Object,
+  buildTranches: Function,
+  stdWidth: Number,
+  shape: Function,  // shape() -> Shape
+  mode: { type: Number, default: 0 }, // rung addition mode: 0 = split, 1 = extend
+  getModelValue: Function,  // getModelValue(model) -> value
+  setModelValue: Function,  // setModelValue(model,value) -> void
+  setValues: Function,  // setValues(values:Array) -> void
+})
+
+const skew100 = computed( {
+  get() {return props.builder.skew*100},
+  set(v) {props.builder.skew = v/100; }
+} )
+
+// validity checks
+watchEffect(()=>{
+  const order = props.order
+  const builder = props.builder
+  props.builder.valid &&=
+      order && builder &&
+      builder.rungs >= 1 && valueA.value &&
+      (builder.rungs < 2 || valueB.value)
+})
+
+
+const rungs = computed({
+  get() {
+    return props.builder.rungs
+  },
+  set(r) {
+    // todo this is subclass specific: make TWAP extend the range rather than compressing it
+    if (!r) {
+      props.builder.rungs = 1
+      return
+    }
+    r = Number(r)
+    props.builder.rungs = r
+    const b = valueB.value
+    console.log('set rungs', r, valueA.value, b)
+    if ( r > 0 && b === null ) {
+      // convert single shape to a range
+      if (props.mode===0) {
+        const width = props.stdWidth
+        const mid = valueA.value
+        console.log('single to range', mid - width/2, mid + width/2)
+        valueA.value = mid - width/2
+        valueB.value = mid + width/2
+      }
+      else if (props.mode===1 ) {
+        valueB.value = valueA.value + props.stdWidth
+      }
+      else
+        throw Error(`Unknown rung mode ${props.mode}`)
+    }
+    else if ( r === 1 && b !== null ) {
+      // convert from a range to a single shape
+      if (props.mode===0)
+        valueA.value = (valueA.value + b) / 2
+      valueB.value = null
+    }
+    else {
+      // from multi to multi
+      if (props.mode===1)
+        valueB.value = valueA.value + props.stdWidth * (r-1)
+    }
+  }
+})
+
+
+const values = computed(()=>{
+  let a = valueA.value
+  let b = valueB.value
+  const r = props.builder.rungs
+  let result
+  if ( a===null || !r )
+    result = []  // no data
+  else if (r===1)
+    result = [a]  // single shape
+  else
+    result = linspace(a, b, r)  // linear spacing
+  props.setValues(result)
+  return result;
+})
+
+
+const weights = computed(() => linearWeights(props.builder.rungs, -props.builder.skew))
+
+
+const amountSymbol = computed(()=>props.order.amountIsTokenA ? co.selectedSymbol.base.s : co.selectedSymbol.quote.s )
+
+
+// colors
+function computeDefaultColor() {
+  const index = props.order.builders.indexOf(props.builder)
+  return sideColor(props.order.buy, index)
+}
+const defaultColor = computeDefaultColor()
+const color = computed({
+  get() {return props.builder.color},
+  set(v) {
+    const maxLightness = 60
+    const c = new Color(v).hsl()
+    props.builder.color = c.saturation <= maxLightness ? v : c.lightness(maxLightness).string()
+  }
+})
+const colors = computed( ()=> {
+  const color = props.builder.color !== null ? props.builder.color
+      : props.buy ? theme.value.colors.success : theme.value.colors.error
+  const ws = weights.value;
+  return weightColors(ws, color);
+})
+const colorStyle = computed(() => {
+  return {'color': color.value}
+})
+
+
+function allocText(weight) {
+  const alloc = props.builder.allocation
+  if (alloc===null) return ''
+  return allocationText(props.order.amount, weight * alloc, amountSymbol.value);
+}
+
+
+//
+// SHAPE MANAGEMENT
+//
+
+// we keep two special control shapes as the edges of the range, with deletable shapes in-between
+
+function createShape(value, model, onModel, onDelete) {
+  console.log('createShape setModelValue', model, value)
+  props.setModelValue(model, value)
+  return new props.shape(model, onModel, onDelete)  // props.shape is the constructor function
+}
+
+
+function translateOnDrag(shape) {
+  const oldOnPoints = shape.onPoints
+  shape.onPoints = function (points) {
+    if (!this.beingDragged()) {
+      oldOnPoints.call(this, points)
+      return
+    }
+    const prev = props.getModelValue(this.model)
+    oldOnPoints.call(this, points)
+    const cur = props.getModelValue(this.model)
+    const delta = cur - prev
+    console.log('move prev/cur', prev, cur, delta)
+    if (delta !== 0) {
+      valueA.value += delta
+      valueB.value += delta
+    }
+  }
+}
+
+
+const shapeA = createShape(valueA.value, {color: defaultColor},
+    function (model) {
+      const value = props.getModelValue(model);
+      if (value!==null && value!==undefined)
+        valueA.value = value;
+      if (model.color)
+        props.builder.color = model.color;
+    },
+    deleteSelf)
+
+if (props.mode===1)
+  translateOnDrag(shapeA)
+
+const shapeB = createShape(valueB.value, {color:defaultColor},
+    function (model) {
+      const value = props.getModelValue(model);
+      if (value!==null && value!==undefined)
+        valueB.value = value;
+      if (model.color)
+        props.builder.color = model.color;
+    },
+    deleteSelf)
+
+function interiorOnModel(model) {
+  const v = model.textColor || model.lineColor || model.color
+  if (v)
+    color.value = v
+}
+
+let interiorShapes = []
+
+function createInteriorShape(price, weight) {
+  const model = {text: allocText(weight), color: props.builder.color};
+  const shape = createShape(price, model, interiorOnModel, deleteSelf)
+  shape.debug = true
+  translateOnDrag(shape)
+  interiorShapes.push(shape)
+  // shape.create() // should happen automatically when a model with valid points is set
+}
+
+
+function removeInteriorShape() {
+  if (interiorShapes.length) {
+    const shape = interiorShapes.pop()
+    shape.delete()
+  }
+}
+
+function adjustShapes() {
+  // this is where all the shapes are created or adjusted
+  console.log('adjustShapes()', valueA.value, valueB.value)
+  const vs = values.value
+  if (vs.length)
+      cancelDrawing()
+  const ws = weights.value
+  const colorStrings = colors.value
+  // shape properties
+  if( vs.length === 0 ) {
+    shapeA.delete()
+    shapeB.delete()
+    for( const shape of interiorShapes )
+      shape.delete()
+    interiorShapes = []
+  }
+  else if (vs.length === 1) {
+    //
+    // SINGLE SHAPE
+    //
+    if (!shapeA.beingDragged()) {
+      const model = {text: allocText(ws[0]), color: colorStrings[0]};
+      console.log('single shape A setModelValue', model, vs[0])
+      props.setModelValue(model, vs[0])
+      shapeA.setModel(model)
+    }
+    shapeB.delete()
+    if (interiorShapes.length) {
+      for( const shape of interiorShapes )
+        shape.delete()
+      interiorShapes = []
+    }
+  }
+  else {
+    //
+    // VALUE RANGE
+    //
+    if (!shapeA.beingDragged()) {
+      const model = {text: allocText(ws[0]), color: colorStrings[0]};
+      console.log('shape A not dragged setModelValue', model, vs[0])
+      props.setModelValue(model, vs[0])
+      shapeA.setModel(model)
+    }
+    if (!shapeB.beingDragged()) {
+      const last = colorStrings.length - 1
+      const model = {text: allocText(ws[last]), color: colorStrings[last]};
+      console.log('shape B not dragged setModelValue', model, vs[last])
+      props.setModelValue(model, vs[last])
+      shapeB.setModel(model)
+    }
+    const numInterior = Math.max(0,vs.length-2);
+    // trim excess interior shapes
+    while( interiorShapes.length > numInterior )
+      removeInteriorShape()
+    // adjust the interior shape values and/or add shapes
+    for( let i=1; i<vs.length-1; i++ ) {
+      const v = vs[i]
+      const w = ws[i];
+      if (i-1 === interiorShapes.length)
+        createInteriorShape(v, w)
+      else if (!interiorShapes[i-1].beingDragged()) {
+        const model = {text: allocText(w), color: colorStrings[i]};
+        console.log('interior setModelValue', model, v)
+        props.setModelValue(model, v)
+        interiorShapes[i-1].setModel(model)
+      }
+    }
+  }
+  return ''
+}
+
+function deleteSelf() {
+  deleteBuilder(props.order, props.builder);
+}
+
+function deleteShapes() {
+  shapeA.delete()
+  shapeB.delete()
+  for (const shape of interiorShapes)
+    shape.delete()
+  interiorShapes = []
+}
+
+
+console.log('valueA', valueA.value, shapeA)
+if (!valueA.value)
+  shapeA.createOrDraw(); // initiate drawing mode
+
+
+</script>
+
+<style scoped lang="scss">
+
+</style>
\ No newline at end of file
diff --git a/src/misc.js b/src/misc.js
index b053381..d7e1cee 100644
--- a/src/misc.js
+++ b/src/misc.js
@@ -172,18 +172,8 @@ export function pairPrice(chainId, baseToken, quoteToken, price) {
 
 export const sleep = ms => new Promise(r => setTimeout(r, ms))
 
-export function builderDefaults(props, emit, defaults) {
-    let changed = false
-    for (const k in defaults)
-        if (props.builder[k] === undefined) {
-            props.builder[k] = defaults[k] instanceof Function ? defaults[k]() : defaults[k]
-            changed = true
-        }
-    if (changed)
-        emit('update:builder', props.builder)
-}
-
 export function uuid() {
+    // noinspection JSUnresolvedReference
     return crypto.randomUUID();
 }
 
@@ -204,7 +194,7 @@ const colorRanges = {
     sell: ['#CC0033', '#CCCC33'],
 }
 
-export function lineColor(buy, index) {
+export function sideColor(buy, index) {
     const range = buy ? colorRanges.buy : colorRanges.sell
     const a = new Color(range[0]).rgb()
     const b = new Color(range[1]).rgb()
@@ -229,3 +219,24 @@ export function unique(arr) {
     }
     return a;
 }
+
+export function linspace(a, b, n) {
+    if (n===1) return [(a+b)/2]  // single line
+    const spacing = (b - a) / (n - 1)
+    // console.log('spacing', a, b)
+    const result = []
+    for (let i = 0; i < n; i++)
+        result.push(a + i * spacing)
+    return result;
+}
+
+export function intervalToSeconds(interval) {
+    if (interval.endsWith('T'))
+        throw Error('Tick intervals not supported')
+    return interval.endsWith('M') ? 30 * 24 * 60 * 60
+         : interval.endsWith('W') ?  7 * 24 * 60 * 60
+         : interval.endsWith('D') ?      24 * 60 * 60
+         : interval.endsWith('S') ?                 1
+         :                                         60  // if no unit char, then it's minutes
+}
+
diff --git a/src/orderbuild.js b/src/orderbuild.js
index 1100b54..033d096 100644
--- a/src/orderbuild.js
+++ b/src/orderbuild.js
@@ -4,6 +4,10 @@ import {useOrderStore, useStore} from "@/store/store.js";
 import {encodeIEE754} from "@/common.js";
 import {defineStore} from "pinia";
 import {computed, ref} from "vue";
+import Color from "color";
+
+
+export const MIN_EXECUTION_TIME = 60  // give at least one full minute for each tranche to trigger
 
 
 function unimplemented() { throw Error('Unimplemented') }
@@ -13,7 +17,10 @@ function unimplemented() { throw Error('Unimplemented') }
 // for instantiating the UI component for a given builder dictionary, based on its builder.component field.
 export function newBuilder( component, options = {}) {
     const id = uuid()
-    return {id, component, options, points: {}, shapes: {}, props: {}, build: unimplemented}
+    return {
+        id, component, options,
+        allocation: 1.0, points: {}, shapes: {}, props: {}, valid: false,
+    }
 }
 
 // Orders hold an amount and builders
@@ -44,6 +51,7 @@ export const useChartOrderStore = defineStore('chart_orders', () => {
     const selectedOrder = ref(null)
     const selectedSymbol = ref(null)
     const selectedPool = ref(null)
+    const intervalSecs = ref(0)
     const baseToken = computed(()=>selectedSymbol.value === null ? null : selectedSymbol.value.base)
     const quoteToken = computed(()=>selectedSymbol.value === null ? null : selectedSymbol.value.quote)
     const price = computed(() => {
@@ -87,7 +95,7 @@ export const useChartOrderStore = defineStore('chart_orders', () => {
     }
 
     return {
-        chartReady, selectedSymbol, selectedPool, baseToken, quoteToken, price,
+        chartReady, selectedSymbol, selectedPool, intervalSecs, baseToken, quoteToken, price,
         orders, drawing, drawingCallbacks, newOrder, removeOrder, resetOrders,
     }
 })
@@ -222,3 +230,51 @@ export function timesliceTranches() {
     return ts
 }
 
+export function builderDefaults(builder, defaults) {
+    for (const k in defaults)
+        if (builder[k] === undefined)
+            builder[k] = defaults[k] instanceof Function ? defaults[k]() : defaults[k]
+}
+
+export function linearWeights(n, s) {
+    if (n === 1) return [1]
+    const result = []
+    if (s === 0) {
+        // equal weighted
+        for (let i = 0; i < n; i++)
+            result.push(1 / n)
+    } else if (s === 1) {
+        result.push(1)
+        for (let i = 1; i < n; i++)
+            result.push(0)
+    } else if (s === -1) {
+        for (let i = 1; i < n; i++)
+            result.push(0)
+        result.push(1)
+    } else {
+        for (let i = 0; i < n; i++)
+            result.push((1 - s * (2 * i / (n - 1) - 1)) / n)
+    }
+    // console.log('weights', result)
+    return result
+}
+
+export function weightColors(weights, color) {
+    const c = new Color(color).rgb()
+    const max = Math.max(...weights)
+    const ns = weights.map((w) => w / max) // set largest weight to 100%
+    const adj = ns.map((w) => c.alpha(Math.pow(w, 0.67))) // https://en.wikipedia.org/wiki/Stevens's_power_law
+    return adj.map((a) => a.string())
+}
+
+export function allocationText(amount, weight, symbol) {
+    // console.log('weight', weight, alloc, props.amount)
+    const a = amount * weight
+    return `${(weight * 100).toFixed(1)}% = ${a.toLocaleString('fullwide')} ${symbol}`
+}
+
+export function deleteBuilder(order, builder) {
+    order.builders = order.builders.filter((b) => b !== builder)
+    // if (props.deleteShapes)  // todo is this redundant?
+    //   props.deleteShapes()
+}
\ No newline at end of file