initial diagonal work (unfinished)

src/vector.js

@@ -11,48 +11,59 @@ export function vectorize(value) {
 }
 
 export function devectorize(value) {
-  return value === null || value.length === 0 ? null : value.length === 1 ? value[0] : value
+    return value === null || value.length === 0 ? null : value.length === 1 ? value[0] : value
 }
 
 
 export function vectorIsNull(value) {
-    console.log('vectorIsNull', value, value === null || value.length === 1 && value[0] === null)
-  return value === null || value.length === 1 && value[0] === null
+    return value === null || value.length === 1 && value[0] === null
+}
+
+
+export function vectorIsZero(value) {
+    for (let i = 0; i < value.length; i++)
+        if (value[i] !== 0)
+            return false
+    return true
 }
 
 
 export function vectorAdd(a, b) {
-  const result = []
-  const scalarB = b.length === undefined
-  for( let i=0; i<a.length; i++ )
-    result.push(a[i]+(scalarB ? b : b[i]))
-  console.log('vectorAdd', a, b, result)
-  return result
+    const result = []
+    const scalarB = b.length === undefined
+    for (let i = 0; i < a.length; i++)
+        result.push(a[i] + (scalarB ? b : b[i]))
+    return result
 }
 
 export function vectorSub(a, b) {
-  const result = []
-  const scalarB = b.length === undefined
-  for( let i=0; i<a.length; i++ )
-    result.push(a[i]-(scalarB ? b : b[i]))
-  console.log('vectorSub', a, b, result)
-  return result
+    const result = []
+    const scalarB = b.length === undefined
+    for (let i = 0; i < a.length; i++)
+        result.push(a[i] - (scalarB ? b : b[i]))
+    return result
 }
 
 export function vectorMul(a, b) {
-  const result = []
-  const scalarB = b.length === undefined
-  for( let i=0; i<a.length; i++ )
-    result.push(a[i]*(scalarB ? b : b[i]))
-  console.log('vectorMul', a, b, result)
-  return result
+    const result = []
+    const scalarB = b.length === undefined
+    for (let i = 0; i < a.length; i++)
+        result.push(a[i] * (scalarB ? b : b[i]))
+    return result
 }
 
 export function vectorDiv(a, b) {
-  const result = []
-  const scalarB = b.length === undefined
-  for( let i=0; i<a.length; i++ )
-    result.push(a[i]/(scalarB ? b : b[i]))
-  console.log('vectorDiv', a, b, result)
-  return result
+    const result = []
+    const scalarB = b.length === undefined
+    for (let i = 0; i < a.length; i++)
+        result.push(a[i] / (scalarB ? b : b[i]))
+    return result
 }
+
+
+export function vectorInterpolate(a, b, zeroToOne) {
+    const d = vectorSub(b, a)
+    const offset = vectorMul(d, zeroToOne)
+    return vectorAdd(a, offset)
+}
+