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Code Issues Releases Wiki Activity

Refactor to use a step function

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This commit is contained in:
Bradlee Speice
2023-07-02 19:30:56 +00:00
parent 4bcc321c4b
commit 79394519c7
6 changed files with 38 additions and 44 deletions
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38
posts/2023/06/flam3/2a-variations.ts
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@ -17,7 +17,7 @@ function r(x: number, y: number) {
}
function theta(x: number, y: number) {
return Math.atan2(x, y);
return Math.atan2(y, x);
}
function omega(): number {
@ -93,6 +93,18 @@ export function weightedChoice<T>(choices: [number, T][]) {
throw "unreachable";
}
export class Flame {
x: number = Math.random() * 2 - 1;
y: number = Math.random() * 2 - 1;
constructor(public readonly transforms: [number, Transform][]) {}
step() {
const transform = weightedChoice(this.transforms);
[this.x, this.y] = transform.apply(this.x, this.y);
}
}
export function plot(x: number, y: number, image: ImageData) {
const pixelX = Math.floor(((x + 2) * image.width) / 4);
const pixelY = Math.floor(((y + 2) * image.height) / 4);
@ -114,23 +126,13 @@ export function plot(x: number, y: number, image: ImageData) {
image.data[index + 3] = 0xff;
}
export class Flame {
constructor(public readonly transforms: [number, Transform][]) {}
export function render(flame: Flame, quality: number, image: ImageData) {
const iterations = quality * image.width * image.height;
render(quality: number, image: ImageData) {
var x = Math.random() * 2 - 1;
var y = Math.random() * 2 - 1;
const iter = quality * (image.width * image.height);
for (var i = 0; i < iter; i++) {
const transform = weightedChoice(this.transforms);
// Play the chaos game
[x, y] = transform.apply(x, y);
if (i > 20) {
plot(x, y, image);
}
for (var i = 0; i < iterations; i++) {
flame.step();
if (i > 20) {
plot(flame.x, flame.y, image);
}
}
}
@ -185,5 +187,5 @@ export function renderBaseline(image: ImageData) {
[transform3Weight, transform3],
]);
flame.render(1, image);
render(flame, 1, image);
}