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142 lines (126 loc) · 5.1 KB
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<!DOCTYPE html>
<html>
<head>
<title>Barnsley's Fern</title>
<style>
#canvas {
border: 1px solid black;
}
.slider-group {
margin-bottom: 20px;
}
</style>
</head>
<body>
<canvas id="canvas" width="600" height="600"></canvas>
<br>
<label for="iterationSlider">Iterations:</label>
<input type="range" id="iterationSlider" min="1000" max="500000" value="250000">
<span id="iterationCount">250000</span>
<br>
<!-- Sliders for each transformation -->
<div class="slider-group" id="transform1">
<strong>Transformation 1:</strong><br>
</div>
<div class="slider-group" id="transform2">
<strong>Transformation 2:</strong><br>
</div>
<div class="slider-group" id="transform3">
<strong>Transformation 3:</strong><br>
</div>
<div class="slider-group" id="transform4">
<strong>Transformation 4:</strong><br>
</div>
<script>
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const iterationSlider = document.getElementById('iterationSlider');
const iterationCount = document.getElementById('iterationCount');
// Original coefficients
const originalCoefficients = {
transform1: {a: 0, b: 0, c: 0, d: 0.16, e: 0, f: 0},
transform2: {a: 0.85, b: 0.04, c: -0.04, d: 0.85, e: 0, f: 1.6},
transform3: {a: 0.2, b: -0.26, c: 0.23, d: 0.22, e: 0, f: 1.6},
transform4: {a: -0.15, b: 0.28, c: 0.26, d: 0.24, e: 0, f: 0.44}
};
function createSliders(transformId) {
const coefficients = ['a', 'b', 'c', 'd', 'e', 'f'];
const transformDiv = document.getElementById(transformId);
coefficients.forEach(coeff => {
const label = document.createElement('label');
label.innerHTML = `${coeff}: `;
label.setAttribute('for', `${transformId}-${coeff}Slider`);
const slider = document.createElement('input');
slider.setAttribute('type', 'range');
slider.setAttribute('id', `${transformId}-${coeff}Slider`);
slider.setAttribute('min', '-1');
slider.setAttribute('max', '1');
slider.setAttribute('step', '0.01');
slider.setAttribute('value', originalCoefficients[transformId][coeff]);
const span = document.createElement('span');
span.setAttribute('id', `${transformId}-${coeff}Value`);
span.innerHTML = originalCoefficients[transformId][coeff];
slider.oninput = () => {
span.textContent = slider.value;
updateFern();
};
transformDiv.appendChild(label);
transformDiv.appendChild(slider);
transformDiv.appendChild(span);
transformDiv.appendChild(document.createElement('br'));
});
}
createSliders('transform1');
createSliders('transform2');
createSliders('transform3');
createSliders('transform4');
function drawFern(n, transforms) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
let x = 0, y = 0;
for (let i = 0; i < n; i++) {
ctx.fillStyle = 'green';
ctx.fillRect(x * 50 + 300, -y * 50 + 500, 1, 1);
let r = Math.random();
let t;
if (r < 0.01) {
t = transforms[0];
} else if (r < 0.86) {
t = transforms[1];
} else if (r < 0.93) {
t = transforms[2];
} else {
t = transforms[3];
}
let nextX = t.a * x + t.b * y + t.e;
let nextY = t.c * x + t.d * y + t.f;
x = nextX;
y = nextY;
}
}
function getTransformValues(transformId) {
return {
a: parseFloat(document.getElementById(`${transformId}-aSlider`).value),
b: parseFloat(document.getElementById(`${transformId}-bSlider`).value),
c: parseFloat(document.getElementById(`${transformId}-cSlider`).value),
d: parseFloat(document.getElementById(`${transformId}-dSlider`).value),
e: parseFloat(document.getElementById(`${transformId}-eSlider`).value),
f: parseFloat(document.getElementById(`${transformId}-fSlider`).value),
};
}
function updateFern() {
const transforms = [
getTransformValues('transform1'),
getTransformValues('transform2'),
getTransformValues('transform3'),
getTransformValues('transform4')
];
drawFern(iterationSlider.value, transforms);
}
iterationSlider.oninput = () => {
iterationCount.textContent = iterationSlider.value;
updateFern();
};
updateFern();
</script>
</body>
</html>