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news 2025/9/18 11:54:22

pc端网站怎么做自适应,影楼网站推广,深圳品牌网站推广公司,网站维护案1 实现思路绘制单个点鼠标事件监听点击事件将点推送到数组中绘制数组中所有点 2 实现代码 <!DOCTYPE html> <html lang"en"><head><meta charset"UTF-8"><meta http-equiv"X-UA-Compatible" content"IEedge&…

1 实现思路

绘制单个点
鼠标事件监听点击事件
将点推送到数组中
绘制数组中所有点

2 实现代码

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><script src="js/glMatrix-0.9.6.min.js"></script><script>let vertexstring = `attribute vec3 a_position;uniform     mat4    proj;void main(void){gl_Position = vec4(a_position,1.0)  ;gl_PointSize=60.0;}`;let fragmentstring = `precision mediump float;void main(void){gl_FragColor = vec4(0.0,0.0,1.0,1.0);}`;var projMat4 = mat4.create();var webgl;function init() {initWebgl();initShader();initBuffer();draw();}function initWebgl() {let webglDiv = document.getElementById('myCanvas');webgl = webglDiv.getContext("webgl");webgl.viewport(0, 0, webglDiv.clientWidth, webglDiv.clientHeight);mat4.ortho(0, webglDiv.clientWidth, webglDiv.clientHeight, 0, -1.0, 1.0, projMat4)}function initShader() {let vsshader = webgl.createShader(webgl.VERTEX_SHADER);let fsshader = webgl.createShader(webgl.FRAGMENT_SHADER);webgl.shaderSource(vsshader, vertexstring);webgl.shaderSource(fsshader, fragmentstring);webgl.compileShader(vsshader);webgl.compileShader(fsshader);if (!webgl.getShaderParameter(vsshader, webgl.COMPILE_STATUS)) {var err = webgl.getShaderInfoLog(vsshader);alert(err);return;}if (!webgl.getShaderParameter(fsshader, webgl.COMPILE_STATUS)) {var err = webgl.getShaderInfoLog(fsshader);alert(err);return;}let program = webgl.createProgram();webgl.attachShader(program, vsshader);webgl.attachShader(program, fsshader)webgl.linkProgram(program);webgl.useProgram(program);webgl.program = program}var points = [];var colors=[];function initBuffer() {let aPsotion = webgl.getAttribLocation(webgl.program, "a_position");document.addEventListener("mousedown", function (e) {debuggerlet x = e.clientX;let y = e.clientY;let rect = e.target.getBoundingClientRect();let pointx = ((x - rect.left) - 512) / 512;//let pointy = -((y - rect.top) - 350) / 350;let pointy = (350 - (y - rect.top)) / 350;points.push(pointx);points.push(pointy);points.push(0);let pointPosition = new Float32Array(points);//创建缓冲区let pointBuffer = webgl.createBuffer();webgl.bindBuffer(webgl.ARRAY_BUFFER, pointBuffer);webgl.bufferData(webgl.ARRAY_BUFFER, pointPosition, webgl.STATIC_DRAW);webgl.enableVertexAttribArray(aPsotion);webgl.vertexAttribPointer(aPsotion, 3, webgl.FLOAT, false, 0, 0);webgl.clearColor(0.0, 0.0, 0.0, 1.0);webgl.clear(webgl.COLOR_BUFFER_BIT | webgl.DEPTH_BUFFER_BIT);webgl.drawArrays(webgl.POINTS, 0, points.length / 3);})let uniformProj = webgl.getUniformLocation(webgl.program, "proj");webgl.uniformMatrix4fv(uniformProj, false, projMat4);}function draw() {webgl.clearColor(0.0, 0.0, 0.0, 1.0);webgl.clear(webgl.COLOR_BUFFER_BIT | webgl.DEPTH_BUFFER_BIT);}</script>
</head><body onload="init()"><canvas id='myCanvas' width="1024" height='700'></canvas>
</body></html>