Log density visualization

blog/2024-11-15-playing-with-fire/1-introduction/GasketWeighted.tsx

@@ -1,6 +1,6 @@
 import {useEffect, useState, useContext} from "react";
 import {PainterContext} from "../src/Canvas";
-import {chaosGameWeighted } from "./chaosGameWeighted";
+import {chaosGameWeighted} from "./chaosGameWeighted";
 import TeX from '@matejmazur/react-katex';
 
 import styles from "../src/css/styles.module.css"
@@ -16,14 +16,15 @@ export default function GasketWeighted() {
     const f1: Transform = (x, y) => [(x + 1) / 2, y / 2];
     const f2: Transform = (x, y) => [x / 2, (y + 1) / 2];
 
-    const {setPainter} = useContext(PainterContext);
+    const {width, height, setPainter} = useContext(PainterContext);
 
     useEffect(() => {
-        setPainter(chaosGameWeighted([
+        const transforms: [number, Transform][] = [
             [f0Weight, f0],
             [f1Weight, f1],
             [f2Weight, f2]
-        ]));
+        ];
+        setPainter(chaosGameWeighted({width, height, transforms}));
     }, [f0Weight, f1Weight, f2Weight]);
 
     const weightInput = (title, weight, setWeight) => (

blog/2024-11-15-playing-with-fire/1-introduction/chaosGameWeighted.ts

@@ -6,8 +6,13 @@ import {Transform} from "../src/transform";
 const iterations = 50_000;
 const step = 1000;
 // hidden-end
-export function* chaosGameWeighted(transforms: [number, Transform][]) {
-    let image = new ImageData(500, 500);
+export type ChaosGameWeightedProps = {
+    width: number,
+    height: number,
+    transforms: [number, Transform][]
+}
+export function* chaosGameWeighted({width, height, transforms}: ChaosGameWeightedProps) {
+    let image = new ImageData(width, height);
     var [x, y] = [randomBiUnit(), randomBiUnit()];
 
     for (let i = 0; i < iterations; i++) {

blog/2024-11-15-playing-with-fire/2-transforms/FlameBlend.tsx

@@ -1,17 +1,12 @@
 import {useContext, useEffect, useState} from "react";
 import {Transform} from "../src/transform";
-import {
-    xform1Coefs,
-    xform1Weight,
-    xform2Coefs,
-    xform2Weight,
-    xform3Coefs,
-    xform3Weight
-} from "../src/params";
+import * as params from "../src/params"
 import {PainterContext} from "../src/Canvas"
-import {buildBlend, buildTransform} from "./buildTransform"
 import {chaosGameFinal} from "./chaosGameFinal"
 import {VariationEditor, VariationProps} from "./VariationEditor"
+import {xform1Weight} from "../src/params";
+import {applyTransform} from "@site/blog/2024-11-15-playing-with-fire/src/applyTransform";
+import {buildBlend} from "@site/blog/2024-11-15-playing-with-fire/2-transforms/buildBlend";
 
 export default function FlameBlend() {
     const {width, height, setPainter} = useContext(PainterContext);
@@ -47,11 +42,21 @@ export default function FlameBlend() {
     // and swap in identity components for each
     const identityXform: Transform = (x, y) => [x, y];
 
-    useEffect(() => setPainter(chaosGameFinal(width, height, [
-        [xform1Weight, buildTransform(xform1Coefs, buildBlend(xform1Coefs, xform1Variations))],
-        [xform2Weight, buildTransform(xform2Coefs, buildBlend(xform2Coefs, xform2Variations))],
-        [xform3Weight, buildTransform(xform3Coefs, buildBlend(xform3Coefs, xform3Variations))]
-    ], identityXform)), [xform1Variations, xform2Variations, xform3Variations]);
+    useEffect(() => {
+        const transforms: [number, Transform][] = [
+            [params.xform1Weight, applyTransform(params.xform1Coefs, buildBlend(params.xform1Coefs, xform1Variations))],
+            [params.xform2Weight, applyTransform(params.xform2Coefs, buildBlend(params.xform2Coefs, xform2Variations))],
+            [params.xform3Weight, applyTransform(params.xform3Coefs, buildBlend(params.xform3Coefs, xform3Variations))]
+        ]
+
+        const gameParams = {
+            width,
+            height,
+            transforms,
+            final: identityXform
+        }
+        setPainter(chaosGameFinal(gameParams));
+    }, [xform1Variations, xform2Variations, xform3Variations]);
 
     return (
         <>

blog/2024-11-15-playing-with-fire/2-transforms/FlameFinal.tsx

@@ -1,40 +1,18 @@
 import {useContext, useEffect, useState} from "react";
 import {Coefs} from "../src/coefs"
-import {
-    xform1Coefs,
-    xform1Weight,
-    xform1Variations,
-    xform1CoefsPost,
-    xform2Coefs,
-    xform2Weight,
-    xform2Variations,
-    xform2CoefsPost,
-    xform3Coefs,
-    xform3Weight,
-    xform3Variations,
-    xform3CoefsPost,
-    xformFinalCoefs as xformFinalCoefsDefault,
-    xformFinalCoefsPost as xformFinalCoefsPostDefault,
-} from "../src/params";
+import * as params from "../src/params";
 import {PainterContext} from "../src/Canvas"
-import {buildBlend, buildTransform} from "./buildTransform";
-import {transformPost} from "./post";
+import {buildBlend} from "./buildBlend";
 import {chaosGameFinal} from "./chaosGameFinal"
 import {VariationEditor, VariationProps} from "./VariationEditor";
 import {CoefEditor} from "./CoefEditor";
-import {Transform} from "../src/transform";
-
-export const transforms: [number, Transform][] = [
-    [xform1Weight, transformPost(buildTransform(xform1Coefs, xform1Variations), xform1CoefsPost)],
-    [xform2Weight, transformPost(buildTransform(xform2Coefs, xform2Variations), xform2CoefsPost)],
-    [xform3Weight, transformPost(buildTransform(xform3Coefs, xform3Variations), xform3CoefsPost)]
-];
+import {applyPost, applyTransform} from "../src/applyTransform";
 
 export default function FlameFinal() {
     const {width, height, setPainter} = useContext(PainterContext);
 
-    const [xformFinalCoefs, setXformFinalCoefs] = useState<Coefs>(xformFinalCoefsDefault);
-    const resetXformFinalCoefs = () => setXformFinalCoefs(xformFinalCoefsDefault);
+    const [xformFinalCoefs, setXformFinalCoefs] = useState<Coefs>(params.xformFinalCoefs);
+    const resetXformFinalCoefs = () => setXformFinalCoefs(params.xformFinalCoefs);
 
     const xformFinalVariationsDefault: VariationProps = {
         linear: 0,
@@ -45,15 +23,14 @@ export default function FlameFinal() {
     const [xformFinalVariations, setXformFinalVariations] = useState<VariationProps>(xformFinalVariationsDefault);
     const resetXformFinalVariations = () => setXformFinalVariations(xformFinalVariationsDefault);
 
-    const [xformFinalCoefsPost, setXformFinalCoefsPost] = useState<Coefs>(xformFinalCoefsPostDefault);
-    const resetXformFinalCoefsPost = () => setXformFinalCoefsPost(xformFinalCoefsPostDefault);
+    const [xformFinalCoefsPost, setXformFinalCoefsPost] = useState<Coefs>(params.xformFinalCoefsPost);
+    const resetXformFinalCoefsPost = () => setXformFinalCoefsPost(params.xformFinalCoefsPost);
 
     useEffect(() => {
         const finalBlend = buildBlend(xformFinalCoefs, xformFinalVariations);
-        const finalTransform = buildTransform(xformFinalCoefs, finalBlend);
-        const finalPost = transformPost(finalTransform, xformFinalCoefsPost);
+        const finalXform = applyPost(xformFinalCoefsPost, applyTransform(xformFinalCoefs, finalBlend));
 
-        setPainter(chaosGameFinal(width, height, transforms, finalPost));
+        setPainter(chaosGameFinal({width, height, transforms: params.xforms, final: finalXform}));
     }, [xformFinalCoefs, xformFinalVariations, xformFinalCoefsPost]);
 
     return (

blog/2024-11-15-playing-with-fire/2-transforms/FlamePost.tsx

@@ -1,45 +1,37 @@
 import {useContext, useEffect, useState} from "react";
 import {Coefs} from "../src/coefs"
 import {Transform} from "../src/transform";
-import {
-    xform1Coefs,
-    xform1Weight,
-    xform1Variations,
-    xform1CoefsPost as xform1CoefsPostDefault,
-    xform2Coefs,
-    xform2Weight,
-    xform2Variations,
-    xform2CoefsPost as xform2CoefsPostDefault,
-    xform3Coefs,
-    xform3Weight,
-    xform3Variations,
-    xform3CoefsPost as xform3CoefsPostDefault
-} from "../src/params";
+import * as params from "../src/params";
 import {PainterContext} from "../src/Canvas"
-import {chaosGameFinal} from "./chaosGameFinal"
+import {chaosGameFinal, ChaosGameFinalProps} from "./chaosGameFinal"
 import {CoefEditor} from "./CoefEditor"
-import {transformPost} from "./post";
-import {buildTransform} from "./buildTransform";
+import {applyPost, applyTransform} from "@site/blog/2024-11-15-playing-with-fire/src/applyTransform";
 
 export default function FlamePost() {
     const {width, height, setPainter} = useContext(PainterContext);
 
-    const [xform1CoefsPost, setXform1CoefsPost] = useState<Coefs>(xform1CoefsPostDefault);
-    const resetXform1CoefsPost = () => setXform1CoefsPost(xform1CoefsPostDefault);
+    const [xform1CoefsPost, setXform1CoefsPost] = useState<Coefs>(params.xform1CoefsPost);
+    const resetXform1CoefsPost = () => setXform1CoefsPost(params.xform1CoefsPost);
 
-    const [xform2CoefsPost, setXform2CoefsPost] = useState<Coefs>(xform2CoefsPostDefault);
-    const resetXform2CoefsPost = () => setXform2CoefsPost(xform2CoefsPostDefault);
+    const [xform2CoefsPost, setXform2CoefsPost] = useState<Coefs>(params.xform2CoefsPost);
+    const resetXform2CoefsPost = () => setXform2CoefsPost(params.xform2CoefsPost);
 
-    const [xform3CoefsPost, setXform3CoefsPost] = useState<Coefs>(xform3CoefsPostDefault);
-    const resetXform3CoefsPost = () => setXform1CoefsPost(xform3CoefsPostDefault);
+    const [xform3CoefsPost, setXform3CoefsPost] = useState<Coefs>(params.xform3CoefsPost);
+    const resetXform3CoefsPost = () => setXform1CoefsPost(params.xform3CoefsPost);
 
     const identityXform: Transform = (x, y) => [x, y];
 
-    useEffect(() => setPainter(chaosGameFinal(width, height, [
-        [xform1Weight, transformPost(buildTransform(xform1Coefs, xform1Variations), xform1CoefsPost)],
-        [xform2Weight, transformPost(buildTransform(xform2Coefs, xform2Variations), xform2CoefsPost)],
-        [xform3Weight, transformPost(buildTransform(xform3Coefs, xform3Variations), xform3CoefsPost)]
-    ], identityXform)), [xform1CoefsPost, xform2CoefsPost, xform3CoefsPost]);
+    const gameParams: ChaosGameFinalProps = {
+        width,
+        height,
+        transforms: [
+            [params.xform1Weight, applyPost(xform1CoefsPost, applyTransform(params.xform1Coefs, params.xform1Variations))],
+            [params.xform2Weight, applyPost(xform2CoefsPost, applyTransform(params.xform2Coefs, params.xform2Variations))],
+            [params.xform3Weight, applyPost(xform3CoefsPost, applyTransform(params.xform3Coefs, params.xform3Variations))],
+        ],
+        final: identityXform
+    }
+    useEffect(() => setPainter(chaosGameFinal(gameParams)), [xform1CoefsPost, xform2CoefsPost, xform3CoefsPost]);
 
     return (
         <>

blog/2024-11-15-playing-with-fire/2-transforms/blend.ts

@@ -1,17 +0,0 @@
-// hidden-start
-import {VariationBlend} from "../src/variationBlend";
-// hidden-end
-export function blend(
-    x: number,
-    y: number,
-    variations: VariationBlend): [number, number] {
-    let [finalX, finalY] = [0, 0];
-
-    for (const [weight, variation] of variations) {
-        const [varX, varY] = variation(x, y);
-        finalX += weight * varX;
-        finalY += weight * varY;
-    }
-
-    return [finalX, finalY];
-}

blog/2024-11-15-playing-with-fire/2-transforms/buildBlend.ts

@@ -1,13 +1,11 @@
-import {applyCoefs, Coefs} from "../src/coefs";
+import {Coefs} from "../src/coefs";
 import {VariationProps} from "./VariationEditor";
-import {Transform} from "../src/transform";
 import {linear} from "../src/linear";
 import {julia} from "../src/julia";
 import {popcorn} from "../src/popcorn";
 import {pdj} from "../src/pdj";
 import {pdjParams} from "../src/params";
-import {blend} from "./blend";
-import {VariationBlend} from "../src/variationBlend";
+import {VariationBlend} from "../src/blend";
 
 export function buildBlend(coefs: Coefs, variations: VariationProps): VariationBlend {
     return [
@@ -17,10 +15,3 @@ export function buildBlend(coefs: Coefs, variations: VariationProps): VariationB
         [variations.pdj, pdj(pdjParams)]
     ]
 }
-
-export function buildTransform(coefs: Coefs, variations: VariationBlend): Transform {
-    return (x: number, y: number) => {
-        [x, y] = applyCoefs(x, y, coefs);
-        return blend(x, y, variations);
-    }
-}

blog/2024-11-15-playing-with-fire/2-transforms/chaosGameFinal.ts

@@ -3,13 +3,20 @@ import { randomBiUnit } from "../src/randomBiUnit";
 import { randomChoice } from "../src/randomChoice";
 import { plotBinary as plot } from "../src/plotBinary"
 import {Transform} from "../src/transform";
-const iterations = 500_000;
-const step = 1000;
+import {ChaosGameWeightedProps} from "../1-introduction/chaosGameWeighted";
 // hidden-end
-export function* chaosGameFinal(width: number, height: number, transforms: [number, Transform][], final: Transform) {
+export type ChaosGameFinalProps = ChaosGameWeightedProps & {
+    final: Transform,
+    quality?: number,
+    step?: number,
+}
+export function* chaosGameFinal({width, height, transforms, final, quality, step}: ChaosGameFinalProps) {
     let image = new ImageData(width, height);
     let [x, y] = [randomBiUnit(), randomBiUnit()];
 
+    const iterations = (quality ?? 0.5) * width * height;
+    step = step ?? 1000;
+
     for (let i = 0; i < iterations; i++) {
         const [_, transform] = randomChoice(transforms);
         [x, y] = transform(x, y);

blog/2024-11-15-playing-with-fire/2-transforms/index.mdx

@@ -133,7 +133,7 @@ $$
 
 The formula looks intimidating, but it's not hard to implement:
 
-import blendSource from "!!raw-loader!./blend";
+import blendSource from "!!raw-loader!../src/blend";
 
 <CodeBlock language={'typescript'}>{blendSource}</CodeBlock>
 

blog/2024-11-15-playing-with-fire/3-log-density/FlameHistogram.tsx

@@ -1,30 +1,27 @@
-import {VictoryChart, VictoryLine, VictoryScatter, VictoryTheme} from "victory";
-import {useContext, useEffect, useState} from "react";
+import React, {useContext, useEffect} from "react";
+import * as params from "../src/params";
 import {PainterContext} from "../src/Canvas";
-import {chaosGameHistogram} from "./chaosGameHistogram";
-import {PlotData, plotHistogram} from "./plotHistogram";
+import {chaosGameHistogram} from "@site/blog/2024-11-15-playing-with-fire/3-log-density/chaosGameHistogram";
 
-function* plotChaosGame(width: number, height: number, setPdf: (data: PlotData) => void, setCdf: (data: PlotData) => void) {
-    const emptyImage = new ImageData(width, height);
-    for (let histogram of chaosGameHistogram(width, height)) {
-        const plotData = plotHistogram(histogram);
-        setPdf(plotData);
-        yield emptyImage;
-    }
+type Props = {
+    quality?: number;
+    paintFn: (width: number, histogram: Uint32Array) => ImageData;
+    children?: React.ReactElement;
 }
-
-export default function FlameHistogram() {
+export default function FlameHistogram({quality, paintFn, children}: Props) {
     const {width, height, setPainter} = useContext(PainterContext);
-    const [pdfData, setPdfData] = useState<{ x: number, y: number }[]>(null);
 
-    useEffect(() => setPainter(plotChaosGame(width, height, setPdfData, null)), []);
+    useEffect(() => {
+        const gameParams = {
+            width,
+            height,
+            transforms: params.xforms,
+            final: params.xformFinal,
+            quality,
+            painter: paintFn
+        }
+        setPainter(chaosGameHistogram(gameParams));
+    }, []);
 
-    return (
-        <VictoryChart theme={VictoryTheme.clean}>
-            <VictoryLine
-                data={pdfData}
-                interpolation='natural'
-            />
-        </VictoryChart>
-    )
+    return children;
 }

blog/2024-11-15-playing-with-fire/3-log-density/chaosGameHistogram.ts

@@ -1,34 +1,34 @@
-import {plot} from "./plotHistogram";
+// hidden-start
 import {randomBiUnit} from "../src/randomBiUnit";
 import {randomChoice} from "../src/randomChoice";
-import {buildTransform} from "../2-transforms/buildTransform";
-import {transformPost} from "../2-transforms/post";
-import {transforms} from "../2-transforms/FlameFinal";
-import * as params from "../src/params";
+import {ChaosGameFinalProps} from "../2-transforms/chaosGameFinal";
+import {camera, histIndex} from "../src/camera";
+// hidden-end
+export type ChaosGameHistogramProps = ChaosGameFinalProps & {
+    painter: (width: number, histogram: Uint32Array) => ImageData;
+}
+export function* chaosGameHistogram({width, height, transforms, final, quality, step, painter}: ChaosGameHistogramProps) {
+    let iterations = (quality ?? 10) * width * height;
+    step = step ?? 100_000;
 
-const finalTransform = buildTransform(params.xformFinalCoefs, params.xformFinalVariations);
-const finalTransformPost = transformPost(finalTransform, params.xformFinalCoefsPost);
-
-const step = 1000;
-const quality = 1;
-
-export function* chaosGameHistogram(width: number, height: number) {
-    let iterations = quality * width * height;
-    let histogram = new Uint32Array(width * height);
+    const histogram = new Uint32Array(width * height);
 
     let [x, y] = [randomBiUnit(), randomBiUnit()];
 
     for (let i = 0; i < iterations; i++) {
         const [_, transform] = randomChoice(transforms);
         [x, y] = transform(x, y);
-        [x, y] = finalTransformPost(x, y);
+        [x, y] = final(x, y);
 
-        if (i > 20)
-            plot(x, y, width, histogram);
-
-        if (i % step === 0)
-            yield histogram;
+        if (i > 20) {
+            const [pixelX, pixelY] = camera(x, y, width);
+            const pixelIndex = histIndex(pixelX, pixelY, width, 1);
+            histogram[pixelIndex] += 1;
         }
 
-    yield histogram;
+        if (i % step === 0)
+            yield painter(width, histogram);
+    }
+
+    yield painter(width, histogram);
 }

blog/2024-11-15-playing-with-fire/3-log-density/index.mdx

@@ -19,17 +19,23 @@ Can we do something more intelligent with that information?
 ## Image histograms
 
 To start with, it's worth demonstrating how much work is actually "wasted."
-We'll render the reference image again, but this time, counting the times
-we tried to turn on a pixel.
+We'll render the reference image again, but this time, set each pixel's transparency
+based on how many times we encounter it in the chaos game:
 
 import CodeBlock from "@theme/CodeBlock";
-import plotHistogramSource from "!!raw-loader!./plotHistogram";
 
-<CodeBlock language="typescript">{plotHistogramSource}</CodeBlock>
+import paintLinearSource from "!!raw-loader!./paintLinear"
+
+<CodeBlock language="typescript">{paintLinearSource}</CodeBlock>
 
 import Canvas from "../src/Canvas";
 import FlameHistogram from "./FlameHistogram";
+import {paintLinear} from "./paintLinear";
 
-<Canvas width={400} height={400} hidden={true}>
-    <FlameHistogram/>
-</Canvas>
+<Canvas><FlameHistogram quality={5} paintFn={paintLinear}/></Canvas>
+
+## Log display
+
+import {paintLogarithmic} from './paintLogarithmic'
+
+<Canvas><FlameHistogram quality={10} paintFn={paintLogarithmic}/></Canvas>

blog/2024-11-15-playing-with-fire/3-log-density/paintLinear.ts

@@ -0,0 +1,18 @@
+export function paintLinear(width: number, histogram: Uint32Array): ImageData {
+    const image = new ImageData(width, histogram.length / width);
+
+    let countMax = 0;
+    for (let value of histogram) {
+        countMax = Math.max(countMax, value);
+    }
+
+    for (let i = 0; i < histogram.length; i++) {
+        const pixelIndex = i * 4;
+        image.data[pixelIndex] = 0; // red
+        image.data[pixelIndex + 1] = 0; // green
+        image.data[pixelIndex + 2] = 0; // blue
+        image.data[pixelIndex + 3] = Number(histogram[i]) / countMax * 0xff;
+    }
+
+    return image;
+}

blog/2024-11-15-playing-with-fire/3-log-density/paintLogarithmic.ts

@@ -0,0 +1,21 @@
+export function paintLogarithmic(width: number, histogram: Uint32Array): ImageData {
+    const image = new ImageData(width, histogram.length / width);
+
+    const histogramLog = new Array<number>();
+    histogram.forEach(value => histogramLog.push(Math.log(value)));
+
+    let histogramLogMax = -Infinity;
+    for (let value of histogramLog) {
+        histogramLogMax = Math.max(histogramLogMax, value);
+    }
+
+    for (let i = 0; i < histogram.length; i++) {
+        const pixelIndex = i * 4;
+        image.data[pixelIndex] = 0; // red
+        image.data[pixelIndex + 1] = 0; // green
+        image.data[pixelIndex + 2] = 0; // blue
+        image.data[pixelIndex + 3] = histogramLog[i] / histogramLogMax * 0xff;
+    }
+
+    return image;
+}

blog/2024-11-15-playing-with-fire/3-log-density/plotHistogram.ts

@@ -1,23 +0,0 @@
-// hidden-start
-import {camera, histIndex} from "../src/camera";
-// hidden-end
-export function plot(x: number, y: number, width: number, hitCount: Uint32Array) {
-    const [pixelX, pixelY] = camera(x, y, width);
-    const pixelIndex = histIndex(pixelX, pixelY, width, 1);
-    hitCount[pixelIndex] += 1;
-}
-
-export type PlotData = {x: number, y: number}[];
-export function plotHistogram(hitCount: Uint32Array) {
-    const data = new Map<number, number>();
-    hitCount.forEach(value => {
-        const bucket = 32 - Math.clz32(value);
-        const currentCount = data.get(bucket) ?? 0;
-        data.set(bucket, currentCount + 1);
-    })
-
-    const output: PlotData = [];
-    data.forEach((value, bucket) =>
-        output.push({x: Math.pow(2, bucket), y: value}));
-    return output;
-}

blog/2024-11-15-playing-with-fire/src/Canvas.tsx

@@ -4,7 +4,7 @@ import BrowserOnly from "@docusaurus/BrowserOnly";
 
 function invertImage(sourceImage: ImageData): ImageData {
     const image = new ImageData(sourceImage.width, sourceImage.height);
-    image.data.forEach((value, index) =>
+    sourceImage.data.forEach((value, index) =>
         image.data[index] = index % 4 === 3 ? value : 0xff - value)
 
     return image;
@@ -13,7 +13,6 @@ function invertImage(sourceImage: ImageData): ImageData {
 type InvertibleCanvasProps = {
     width: number,
     height: number,
-    hidden?: boolean,
     // NOTE: Images are provided as a single-element array
     //so we can allow re-painting with the same (modified) ImageData reference.
     image?: [ImageData],
@@ -27,7 +26,7 @@ type InvertibleCanvasProps = {
  * @param hidden Hide the canvas element
  * @param image Image data to draw on the canvas
  */
-const InvertibleCanvas: React.FC<InvertibleCanvasProps> = ({width, height, hidden, image}) => {
+const InvertibleCanvas: React.FC<InvertibleCanvasProps> = ({width, height, image}) => {
     const [canvasCtx, setCanvasCtx] = useState<CanvasRenderingContext2D>(null);
     const canvasRef = useCallback(node => {
         if (node !== null) {
@@ -54,7 +53,6 @@ const InvertibleCanvas: React.FC<InvertibleCanvasProps> = ({width, height, hidde
             ref={canvasRef}
             width={width}
             height={height}
-            hidden={hidden ?? false}
             style={{
                 aspectRatio: width / height,
                 width: '75%'
@@ -73,7 +71,6 @@ export const PainterContext = createContext<PainterProps>(null);
 interface CanvasProps {
     width?: number;
     height?: number;
-    hidden?: boolean;
     children?: React.ReactElement;
 }
 
@@ -105,7 +102,7 @@ interface CanvasProps {
  * but we rely on contexts to manage the iterator, and I can't find
  * a good way to make those generic.
  */
-export default function Canvas({width, height, hidden, children}: CanvasProps) {
+export default function Canvas({width, height, children}: CanvasProps) {
     const [image, setImage] = useState<[ImageData]>(null);
     const [painterHolder, setPainterHolder] = useState<[Iterator<ImageData>]>(null);
     useEffect(() => {
@@ -135,7 +132,7 @@ export default function Canvas({width, height, hidden, children}: CanvasProps) {
     return (
         <>
             <center>
-                <InvertibleCanvas width={width} height={height} hidden={hidden} image={image}/>
+                <InvertibleCanvas width={width} height={height} image={image}/>
             </center>
             <PainterContext.Provider value={{width, height, setPainter}}>
                 <BrowserOnly>{() => children}</BrowserOnly>

blog/2024-11-15-playing-with-fire/src/applyTransform.ts

@@ -0,0 +1,9 @@
+import {Transform} from "./transform";
+import {applyCoefs, Coefs} from "./coefs";
+import {blend, VariationBlend} from "./blend";
+
+export const applyTransform = (coefs: Coefs, variations: VariationBlend): Transform =>
+    (x, y) => blend(...applyCoefs(x, y, coefs), variations);
+
+export const applyPost = (coefsPost: Coefs, transform: Transform): Transform =>
+    (x, y) => applyCoefs(...transform(x, y), coefsPost);

blog/2024-11-15-playing-with-fire/src/blend.ts

@@ -0,0 +1,18 @@
+// hidden-start
+import {Variation} from "./variation";
+// hidden-end
+export type VariationBlend = [number, Variation][];
+export function blend(
+    x: number,
+    y: number,
+    variations: VariationBlend): [number, number] {
+    let [finalX, finalY] = [0, 0];
+
+    for (const [weight, variation] of variations) {
+        const [varX, varY] = variation(x, y);
+        finalX += weight * varX;
+        finalY += weight * varY;
+    }
+
+    return [finalX, finalY];
+}

blog/2024-11-15-playing-with-fire/src/params.ts

@@ -4,11 +4,13 @@
  */
 
 import { Coefs } from './coefs';
-import {VariationBlend} from "./variationBlend";
+import {VariationBlend} from "./blend";
 import { linear } from './linear'
 import { julia } from './julia'
 import { popcorn } from './popcorn'
 import {pdj, PdjParams} from './pdj'
+import {Transform} from "./transform";
+import {applyPost, applyTransform} from "./applyTransform";
 
 export const identityCoefs: Coefs = {
     a: 1, b: 0, c: 0,
@@ -66,6 +68,14 @@ export const xformFinalVariations: VariationBlend = [
 ]
 export const xformFinalColor = 0;
 
+export const xforms: [number, Transform][] = [
+    [xform1Weight, applyPost(xform1CoefsPost, applyTransform(xform1Coefs, xform1Variations))],
+    [xform2Weight, applyPost(xform2CoefsPost, applyTransform(xform2Coefs, xform2Variations))],
+    [xform3Weight, applyPost(xform3CoefsPost, applyTransform(xform3Coefs, xform3Variations))],
+]
+
+export const xformFinal: Transform = applyPost(xformFinalCoefsPost, applyTransform(xformFinalCoefs, xformFinalVariations));
+
 export const palette =
     "7E3037762C45722B496E2A4E6A2950672853652754632656" +
     "5C265C5724595322574D2155482153462050451F4E441E4D" +

blog/2024-11-15-playing-with-fire/src/variationBlend.ts

@@ -1,2 +0,0 @@
-import {Variation} from "./variation";
-export type VariationBlend = [number, Variation][];