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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<canvas id="my_canvas" width="1000" height="800"></canvas>
<script>
var myCanvas = document.getElementById("my_canvas");
var ctx = myCanvas.getContext("2d");
function draw(startX, startY, len, angle, branchWidth) {
ctx.lineWidth = branchWidth;
ctx.beginPath();
ctx.save();
ctx.strokeStyle = "magenta";
ctx.fillStyle = "magenta";
ctx.translate(startX, startY);
ctx.rotate(angle * Math.PI/180);
ctx.moveTo(0, 0);
ctx.lineTo(0, -len);
ctx.stroke();
ctx.shadowBlur = 15;
ctx.shadowColor = "rgba(0,0,0,0.8)";
if(len < 10) {
ctx.restore();
return;
}
draw(0, -len, len*0.8, angle-15, branchWidth*0.8);
draw(0, -len, len*0.8, angle+15, branchWidth*0.8);
ctx.restore();
}
draw(400, 600, 120, 0, 10)
</script>
</body>
</html>