使用welgl绘制国旗
第一次玩这个觉得还挺牛逼的
框架 three.js 原生webgl貌似比较繁琐 不适合我们这样的初学者
http://www.hewebgl.com/ 这个是我刚入门的网站 从里面抄了好多代码
有几个例子真的强 http://www.hewebgl.com/code/show/4.html
图形学作业是绘制国旗 我闲着没事 （好多作业TOT）就去玩了一把
毕竟基础的前端就是ctrl+C ctrl+V （前端别打我） 效果大概是这样的 有些地方画的比较歪 调一下参数就好了 2333 忙死了就不调了
画圆
画平面
画七角的比较有趣 想着一个点在两个不同大小的圆之间动来动去的路径
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Three框架</title>
<script src="https://cdn.bootcss.com/three.js/r83/three.js"></script>
<style type="text/css">
div#canvas-frame {
border: none;
cursor: pointer;
width: 100%;
height: 600px;
background-color: #EEEEEE;
}
</style>
<script>
var renderer;
function initThree() {
width = document.getElementById('canvas-frame').clientWidth;
height = document.getElementById('canvas-frame').clientHeight;
renderer = new THREE.WebGLRenderer({
antialias : true
});
renderer.setSize(width, height);
document.getElementById('canvas-frame').appendChild(renderer.domElement);
renderer.setClearColor(0xFFFFFF, 1.0);
}
var camera;
function initCamera() {
camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
camera.position.x = 0;
camera.position.y = 1000;
camera.position.z = 0;
camera.up.x = 0;
camera.up.y = 0;
camera.up.z = 1;
camera.lookAt({
x : 0,
y : 0,
z : 0
});
}
var scene;
function initScene() {
scene = new THREE.Scene();
}
var material = new THREE.MeshBasicMaterial({
color: 0x003993,
wireframe: true
});
function drawPlane(scene, material) {
var plane = new THREE.Mesh(new THREE.PlaneGeometry(4, 4), material);
scene.add(plane);
}
var light;
function initLight() {
light = new THREE.DirectionalLight(0xFF0000, 1.0, 0);
light.position.set(100, 100, 200);
scene.add(light);
}
var cube;
function initObject() {
var geometry = new THREE.Geometry();
var material = new THREE.LineBasicMaterial( { vertexColors: true } );
var color1 = new THREE.Color( 0x003993 ), color2 = new THREE.Color( 0x003993 );
// 线的材质可以由2点的颜色决定
var p1 = new THREE.Vector3( 756, 0, 222 );
var p2 = new THREE.Vector3( -756, 0, 222 );
geometry.vertices.push(p1);
geometry.vertices.push(p2);
geometry.colors.push( color1, color2 );
var line = new THREE.Line( geometry, material, THREE.LinePieces );
scene.add(line);
}
var width = 1512;
var height = 756;
function createRect(){//背景蓝
var planeGeometry = new THREE.PlaneBufferGeometry(width,height, 1, 1);
// 创建平面的材料
var planeMaterial = new THREE.MeshBasicMaterial({color: 0x003993});
// 合成平面
var plane = new THREE.Mesh(planeGeometry, planeMaterial);
// 设置平面的旋转角度
plane.rotation.x = -0.5 * Math.PI;
// // 设置平面的位置
// plane.position.x = 0;
// plane.position.y = 0;
// plane.position.z = 0;
// 在场景中添加平面
scene.add(plane);
}
function createRect1(){//背景红 横着
var planeGeometry = new THREE.PlaneBufferGeometry(width/2,height/10, 1, 1);
// 创建平面的材料
var planeMaterial = new THREE.MeshBasicMaterial({color: 0xFF0000});
// 合成平面
var plane = new THREE.Mesh(planeGeometry, planeMaterial);
// 设置平面的旋转角度
plane.rotation.x = -0.5 * Math.PI;
// // 设置平面的位置
plane.position.x = width/4;
plane.position.y =0;
plane.position.z = height/4;
// 在场景中添加平面
scene.add(plane);
}
function createRect2(){//背景红 竖着
var planeGeometry = new THREE.PlaneBufferGeometry(width/20,height/2, 1, 1);
// 创建平面的材料
var planeMaterial = new THREE.MeshBasicMaterial({color: 0xFF0000});
// 合成平面
var plane = new THREE.Mesh(planeGeometry, planeMaterial);
// 设置平面的旋转角度
plane.rotation.x = -0.5 * Math.PI;
// // 设置平面的位置
plane.position.x = width/4;
plane.position.y =0;
plane.position.z = height/4;
// 在场景中添加平面
scene.add(plane);
}
function createRect3(){//背景白 横着
var planeGeometry = new THREE.PlaneBufferGeometry(width/2,height/6, 1, 1);
// 创建平面的材料
var planeMaterial = new THREE.MeshBasicMaterial({color: 0xFFFFFF});
// 合成平面
var plane = new THREE.Mesh(planeGeometry, planeMaterial);
// 设置平面的旋转角度
plane.rotation.x = -0.5 * Math.PI;
// // 设置平面的位置
plane.position.x = width/4;
plane.position.y =0;
plane.position.z = height/4;
// 在场景中添加平面
scene.add(plane);
}
function createSeven(){ //左下角最大的
var rectShape= new THREE.Shape();
var R = 2268/29;var r = 1008/29;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = width/4;
var se = height/4;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createSeven1(){ //右边第一个
var rectShape= new THREE.Shape();
var R = 1080/29;var r = 600/29;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = -width/16;
var se = -height/16;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createSeven2(){ //右边第2个
var rectShape= new THREE.Shape();
var R = 1080/29;var r = 600/29;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = -width/4;
var se = -height/3;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createSeven3(){ //右边第3个
var rectShape= new THREE.Shape();
var R = 1080/29;var r = 600/29;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = -width/4;
var se = height/3;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createSeven4(){ //右边第4个
var rectShape= new THREE.Shape();
var R = 1080/49;var r = 600/49;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = -width/3;
var se = -height/38;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createSeven5(){ //右边第5个 七角星
var rectShape= new THREE.Shape();
var R = 1080/29;var r = 600/29;
var theta = Math.PI/2;
var delta = Math.PI/7;
var sx = -width/2.6;
var se = -height/4;
rectShape.moveTo(sx,se);
for(var i=0;i<8;i++){
rectShape.lineTo(sx-R*Math.cos(theta), se-R*Math.sin(theta));
theta-=delta;
rectShape.lineTo(sx-r*Math.cos(theta), se-r*Math.sin(theta));
theta-=delta;
}
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createRect4(){//背景白 竖着
var planeGeometry = new THREE.PlaneBufferGeometry(width/13,height/2, 1, 1);
// 创建平面的材料
var planeMaterial = new THREE.MeshBasicMaterial({color: 0xFFFFFF});
// 合成平面
var plane = new THREE.Mesh(planeGeometry, planeMaterial);
// 设置平面的旋转角度
plane.rotation.x = -0.5 * Math.PI;
// // 设置平面的位置
plane.position.x = width/4;
plane.position.y =0;
plane.position.z = height/4;
// 在场景中添加平面
scene.add(plane);
}
function initObject1() {
var geometry = new THREE.Geometry();
var material = new THREE.LineBasicMaterial( { vertexColors: true } );
var color1 = new THREE.Color( 0x003993 ), color2 = new THREE.Color( 0x003993 );
// 线的材质可以由2点的颜色决定
var p1 = new THREE.Vector3( 756, 0, -378 );
var p2 = new THREE.Vector3( -756, 0, -378 );
geometry.vertices.push(p1);
geometry.vertices.push(p2);
geometry.colors.push( color1, color2 );
var line = new THREE.Line( geometry, material, THREE.LinePieces );
scene.add(line);
}
function createCircle(){
var geometry = new THREE.CircleBufferGeometry( 35, 100 );
var material = new THREE.MeshBasicMaterial( { color: 0xFFFFFF } );
var circle = new THREE.Mesh( geometry, material );
circle.rotation.x = -0.5 * Math.PI;
circle.position.x = width/4;
circle.position.y =0;
circle.position.z = -height/4;
scene.add( circle );
}
function createMi1(){ //左上角到右下角的米 白色
var rectShape= new THREE.Shape();
var sx = width/2;
var se = -height/2;
rectShape.moveTo(sx,se);
rectShape.lineTo(sx+80, se);
rectShape.lineTo(80,0);
rectShape.lineTo(0,0);
rectShape.lineTo(0,-42);
rectShape.lineTo(sx-80,se);
rectShape.lineTo(sx,se);
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createMi2(){ //左下角到右上角的米 白色
var rectShape= new THREE.Shape();
var sx = width/2;
var se = 0;
rectShape.moveTo(sx,se);
rectShape.lineTo(sx-80, se);
rectShape.lineTo(0,-height/2+42);
rectShape.lineTo(0,-height/2);
rectShape.lineTo(80,-height/2);
rectShape.lineTo(sx,se-42);
rectShape.lineTo(sx,se);
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xffffff } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createRed1(){ //左下角到右上角 的红
var rectShape= new THREE.Shape();
var sx = width/2;
var se = 0;
rectShape.moveTo(sx,se);
rectShape.lineTo(sx-60, se);
rectShape.lineTo(0,-height/2);
rectShape.lineTo(50,-height/2);
rectShape.lineTo(sx,se);
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xFF0000 } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function createRed2(){ //左上角到右下角 的红
var rectShape= new THREE.Shape();
var sx = width/2;
var se = -height/2;
rectShape.moveTo(sx,se);
rectShape.lineTo(sx, se+22);
rectShape.lineTo(0,0);
rectShape.lineTo(0,-22);
rectShape.lineTo(sx,se);
var rectGeom = new THREE.ShapeGeometry( rectShape );
var rectMesh = new THREE.Mesh( rectGeom, new THREE.MeshBasicMaterial( { color: 0xFF0000 } ) ) ;
rectMesh.rotation.x = -0.5 * Math.PI;
scene.add(rectMesh);
}
function threeStart() {
initThree();
initCamera();
initScene();
initLight();
createRect();
createMi1();
createMi2();
createRed1();
createRed2();
createRect3();
createRect4();
createRect1();
createRect2();
createSeven();
createSeven1();
createSeven2();
createSeven3();
createSeven4();
createSeven5();
renderer.clear();
renderer.render(scene, camera);
}
</script>
</head>
<body onload="threeStart();">
<div id="canvas-frame"></div>
</body>
</html>