104 lines
2.5 KiB
JavaScript
104 lines
2.5 KiB
JavaScript
function uuidv4() {
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return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, (c) =>
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(
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c ^
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(crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
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).toString(16)
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);
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}
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function loadJavaScript(path) {
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const script = document.createElement("script");
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script.src = path;
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document.head.appendChild(script);
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}
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function playdemos(list, delay = 10) {
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let fps = frameRate();
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fps = 60;
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let n = floor((frameCount / (delay * fps)) % list.length);
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let func = list[n];
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func();
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}
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function drawGrid(color = 255, fade = 32) {
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push();
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colorMode(RGB);
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stroke(color, fade);
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strokeWeight(1);
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for (let x = 0; x < width; x += 10) line(x, 0, x, height);
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for (let y = 0; y < height; y += 10) line(0, y, width, y);
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pop();
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}
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function textInfo(title, date, name = "赵海洋爸爸", color = 255) {
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push();
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colorMode(RGB);
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fill(color);
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noStroke();
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text(`作品：${title}`, 30, height - 70);
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text(`作者：${name}`, 30, height - 50);
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text(`日期：${date}`, 30, height - 30);
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pop();
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}
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function drawVector(vector, color = "#FFFFFF") {
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push();
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fill(color);
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stroke(color);
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line(0, 0, vector.x, vector.y);
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circle(0, 0, 4);
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translate(vector.x, vector.y);
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rotate(vector.heading());
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triangle(0, 0, -4, -2, -4, +2);
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pop();
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}
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function vectorProjection(v1, v2) {
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const v2n = v2.copy().normalize();
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const sp = v1.dot(v2n);
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return v2n.setMag(sp);
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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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// cartesian to polar
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function cartesianToPolara(x, y) {
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let v = createVector(x, y);
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return { r: v.mag(), θ: createVector(1, 0).angleBetween(v) };
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}
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// polar to cartesian
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function polarToCartesian(r, θ) {
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return { x: r * cos(θ), y: -r * sin(θ) };
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}
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function drawRect(x, y, w, h, c = "bottom") {
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push();
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switch (c) {
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case "top":
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break;
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case "left":
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break;
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case "right":
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break;
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default:
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rect(x - w / 2, y - h, w, h);
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break;
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}
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pop();
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}
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