47 lines
924 B
JavaScript
47 lines
924 B
JavaScript
const ball = {
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x: 200,
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y: 200,
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size: 0,
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speed: 1,
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};
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function setup() {
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createCanvas(400, 400);
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}
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function draw() {
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background(255);
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strokeWeight(4);
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stroke("yellow");
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fill(ball.size, 0, 0);
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star(ball.x, ball.y, 100, ball.size, 6);
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ball.size += ball.speed;
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ball.speed *= 1.1;
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if (ball.size >= 200) {
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ball.size = 200;
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ball.speed = -1;
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}
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if (ball.size <= 0) {
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ball.size = 0;
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ball.speed = 1;
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}
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}
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function star(x, y, radius1, radius2, npoints) {
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let angle = TWO_PI / npoints;
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let halfAngle = angle / 2.0;
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beginShape();
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for (let a = 0; a < TWO_PI; a += angle) {
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let sx = x + cos(a) * radius2;
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let sy = y + sin(a) * radius2;
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vertex(sx, sy);
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sx = x + cos(a + halfAngle) * radius1;
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sy = y + sin(a + halfAngle) * radius1;
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vertex(sx, sy);
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}
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endShape(CLOSE);
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}
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