HTML5+canvas相互碰撞散开红色小球

来源：互联网 2023-03-16 19:10:17 147

HTML5 canvas相互碰撞散开红色小球

工具/原料

adobe dreamweaver

方法/步骤

新建html文档。薪码

HTML5 canvas相互碰撞散开红色小球

书写hmtl代码。低祝倘canvas id="screen">/canvas>

HTML5 canvas相互碰撞散开红色小球

书写css代码。

style>

html { overflow: hidden; -ms-touch-action: none; -ms-content-zooming: none; }

body { position: absolute; margin: 0; padding: 0; background: #222; width: 100%; height: 100%; }

#screen { position: absolute; width: 100%; height: 100%; background: #000; cursor: pointer; }

.search { background: #0065CB !important; }

/style>

HTML5 canvas相互碰撞散开红色小球

书写并添加js代码。救醒

script>

"use strict";

(function () {

var scr, ctx, pointer, grid, npart, ipart, pdiam, gw, gh, ax = 0, ay = 0;

var obj = [];

var Particle = function () {

this.x = Math.random() * scr.width;

this.y = Math.random() * scr.height;

this.vx = 0;

this.vy = 0;

this.dx = 0;

this.dy = 0;

this.w = pdiam * .5;

}

Particle.prototype.move = function () {

this.x = this.dx;

this.y = this.dy;

this.vx = this.dx;

this.vy = this.dy;

this.dx = 0;

this.dy = 0;

ctx.drawImage(ipart, this.x - this.w, this.y - this.w, this.w * 2, this.w * 2);

}

Particle.prototype.physics = function () {

if (pointer.isDown) {

var dx = this.x - pointer.X;

var dy = this.y - pointer.Y;

var d = Math.sqrt(dx * dx dy * dy);

if (d Math.min(scr.width, scr.height) / 2) {

this.dx = dx / d * 0.5;

this.dy = dy / d * 0.5;

}

this.vx = ax;

this.vy = ay;

//this.vy = .1;

this.x = this.vx;

this.y = this.vy;

if (this.x pdiam * .5) this.dx = (pdiam * .5 - this.x);

else if (this.x > scr.width - pdiam * .5) this.dx -= (this.x - scr.width pdiam * .5);

if (this.y pdiam * .5) this.dy = (pdiam * .5 - this.y);

else if (this.y > scr.height - pdiam * .5) this.dy -= (this.y - scr.height pdiam * .5);

var gx = Math.round(this.x / (pdiam * 4));

var gy = Math.round(this.y / (pdiam * 4));

for (var ix = gx - 1; ix = gx 1; ix ) {

for (var iy = gy - 1; iy = gy 1; iy ) {

var g = grid[iy * gw ix] || [];

for (var j = 0, l = g.length; j l; j ) {

var that = g[j];

var dx = that.x - this.x;

var dy = that.y - this.y;

var d = Math.sqrt(dx * dx dy * dy);

if (d pdiam) {

dx = (dx / d) * (pdiam - d) * .25;

dy = (dy / d) * (pdiam - d) * .25;

this.dx -= dx;

this.dy -= dy;

that.dx = dx;

that.dy = dy;

}

if (!grid[gy * gw gx]) grid[gy * gw gx] = [this];

else grid[gy * gw gx].push(this);

}

var run = function () {

ctx.clearRect(0, 0, scr.width, scr.height);

grid = new Array(gw * gh);

for(var i = 0; i npart; i ) obj[i].physics();

for(var i = 0; i npart; i ) obj[i].move();

requestAnimFrame(run);

}

var init = function (p) {

pdiam = p.particleSize;

scr = new ge1doot.Screen({

container: "screen",

resize: function () {

gw = Math.round(scr.width / (pdiam * 4));

gh = Math.round(scr.height / (pdiam * 4));

}

});

ctx = scr.ctx;

scr.resize();

pointer = new ge1doot.Pointer({});

ipart = new Image();

ipart.src = p.particleImg;

npart = Math.round(((scr.width * scr.height) / (pdiam * pdiam)) * 0.6);

for (var i = 0; i npart; i ) {

obj[i] = new Particle();

}

if (window.DeviceMotionEvent != undefined) {

window.ondevicemotion = function(e) {

ax = e.accelerationIncludingGravity.x * 0.1;

ay = -e.accelerationIncludingGravity.y * 0.1;

if (ax > 0.1) ax = 0.1; else if (ax -0.1) ax = -0.1;

if (ay > 0.1) ay = 0.1; else if (ay -0.1) ay = -0.1;

if (window.innerWidth / window.innerHeight > 1) {

var t = ay;

ay = ax;

ax = -t;

}

} else ay = 0.1;

run();

}

return {

load : function (p) {

window.addEventListener('load', function () {

init(p);

}, false);

}

})().load({

particleImg: "images/la.png",

particleSize: 32

});

/script>

HTML5 canvas相互碰撞散开红色小球

代码整体结构。

HTML5 canvas相互碰撞散开红色小球

5相关内容非法爬取自百度经验

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HTML5 canvas相互碰撞散开红色小球

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HTML5+canvas相互碰撞散开红色小球

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