风火轮旋转动画特效
代码语言:html
所属分类:动画
下面为部分代码预览,完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title> - Radiation Vibe</title> <style> body { background-color: #000; margin: 0; overflow: hidden; background-repeat: no-repeat; display: flex; align-items: center; justify-content: center; } </style> </head> <body translate="no"> <body> <canvas id="canvas"></canvas> </body> <script id=> var canvas = document.getElementById("canvas"); canvas.width = Math.min(window.innerWidth, window.innerHeight); canvas.height = canvas.width; var gl = canvas.getContext("webgl"); //Time var dt = 0.004; var time = 3.0; //************** Shader sources ************** var vertexSource = ` attribute vec2 position; void main() { gl_Position = vec4(position, 0.0, 1.0); } `; var fragmentSource = ` #define PI 3.14159265358979323846 precision highp float; uniform float width; uniform float height; vec2 resolution = vec2(width, height); uniform float time; vec2 rotate(vec2 _st, float _angle) { _st -= 0.5; _st = mat2(cos(_angle),-sin(_angle), sin(_angle),cos(_angle)) * _st; _st.y += 0.5; _st.x += .5; return _st; } void main(){ //set up positions and time vec2 uv = gl_FragCoord.xy/resolution.xy; float t = mod(time, 4.0*PI); t = t * sin(PI/5.0); vec2 pos = uv; pos = vec2(0.5, 0.5)-pos; //calculate distances and angles float d = length(pos);/*distance from center*/ float id = 1.0 - d;/*inverse d, greater near the center*/ float theta = -(atan(pos.y, pos.x)); float rot = (2.0*PI*(id+1.0))*(t)+(6.0*theta); //rotate both positions pos = rotate(pos, -rot); uv = rotate(uv, -rot); //motion for(float i = 1.0; i < 12.0; i+=1.0){ uv.x += .05*(cos(t+id+2.0*i)*uv.y*uv.x); uv += t+.05*(cos(t*.1)+sin(t)/d-3.0*i); } //colors vec3 col = -d + 0.5*(cos(id-rot+pos.xyx+vec3(0,2,4))); vec3 col2 = id + 0.5*cos(id-cos(uv.xyx+vec3(0,2,4))); float arg = (d+rot+uv.x); vec3 col3 = mix(col, col2, cos(arg*4.0)); col2 = id-col2; col3 *= col3; gl_FragColor = vec4(((col+col+col2/col3))/(col3-col-col2),1.0); } `; //************** Utility functions ************** window.addEventListener('resize', onWindowResize, false); function onWindowResize() { canvas.width = Math.min(window.innerWidth, window.innerHeight); canvas.height = canvas.width; gl.viewport(0, 0, canvas.width, canvas.height); gl.uniform1f(widthHandle, canvas.width); gl.uniform1f(heightHandle, canvas.height); } //Compile shader and combine with source function compileShader(shaderSource, shaderType) { var shader = gl.createShader(shaderType); gl.........完整代码请登录后点击上方下载按钮下载查看
网友评论0