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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Color Gradients</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<script src="./build/three.js"></script>
<script src="./js/Detector.js"></script>
<script src="./js/libs/stats.min.js"></script>
<script src="./js/libs/dat.gui.min.js"></script>
<script src="./js/controls/OrbitControls.js"></script>
<script src="./js/_custom/ColorGradient_Influence.js"></script>
<script src="./scripts/jscolor.js"></script>
<link rel="stylesheet" type="text/css" href="./style/common.css">
<style>
#canvas2d_wrapper {
position: absolute;
top: 0; left: 0;
width: 400px;
height: 200px;
}
#drawingcanvas {
display: none;
width: 100%;
}
#btn_resetColors {
position: relative;
top: 0;
right: 0;
width: 200px;
height: 30px;
background-color: #f30;
color: #000;
}
#btn_resetPattern {
position: relative;
top: 0;
right: 0;
width: 200px;
height: 30px;
background-color: #f90;
color: #000;
}
#controls {
position: fixed;
left: 50%;
margin-left: -100px;
bottom: 20px;
width: 100px;
height: 40px;
background-color: #000;
border-radius: 20px;
cursor: pointer;
z-index: 9999;
}
#controls:hover {
opacity: 0.8;
}
#btn_download {
position: relative;
margin: 0 auto;
margin-top: 7px;
width: 24px;
height: 24px;
background-image: url('images/download.png');
background-size: cover;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="controls" onclick="downloadImage()"><div id="btn_download"></div></div>
<div id="palette">
<input class="jscolor" id="color_0" onchange="update( id, this.jscolor )" value="cc66ff">
<input class="jscolor" id="color_1" onchange="update( id, this.jscolor )" value="0099ff">
<input class="jscolor" id="color_2" onchange="update( id, this.jscolor )" value="0099ff">
<input class="jscolor" id="color_3" onchange="update( id, this.jscolor )" value="0099ff">
<input class="jscolor" id="color_4" onchange="update( id, this.jscolor )" value="0099ff">
<input class="jscolor" id="color_5" onchange="update( id, this.jscolor )" value="0099ff">
<div id="btn_resetColors" onclick="testRefreshColor()">Reset Colors</div>
<div id="btn_resetPattern" onclick="testRefreshPattern()">Reset Pattern</div>
</div>
<div id="canvas2d_wrapper"><canvas id="drawingcanvas" width="1024" height="512" ></canvas></div>
<script id="vertexShader" type="x-shader/x-vertex">
varying vec2 vUv;
void main() {
vUv = uv;
// vUv += vec2( 0.1, 0.1 );
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}
</script>
<script id="fragment_shader_screen" type="x-shader/x-fragment">
precision highp float;
uniform sampler2D tDiffuse;
uniform float uTime;
varying vec2 vUv;
const float speed = 15.0;
const float magnitude = 0.15;
void main() {
vec2 wavyCoord;
wavyCoord.s = vUv.s + (sin(uTime+vUv.t*speed) * magnitude);
wavyCoord.t = vUv.t + (cos(uTime+vUv.s*speed) * magnitude);
vec4 frameColor = texture2D(tDiffuse, wavyCoord);
gl_FragColor = frameColor;
// vec4 frameColor = texture2D(tDiffuse, vUv);
// float luminance = frameColor.r * 0.3 + frameColor.g * 0.59 + frameColor.b * 0.11;
// gl_FragColor = vec4(luminance, luminance, sin(uTime), frameColor.a);
}
</script>
<script type="text/javascript">
function update( id, jscolor ) {
var color = jscolor.toHEXString().slice(1,7);
var index = id.split('').pop();
BaseCanvas2d.colorscheme_1[ index ] = color;
}
function testRefreshPattern() {
BaseCanvas2d.reset2dPattern();
BaseCanvas2d.drawCanvas2d();
}
function testRefreshColor() {
BaseCanvas2d.drawCanvas2d();
}
// 获取一个canvas的 drawing context
var drawingCanvas = document.getElementById( 'drawingcanvas' );
var BaseCanvas2d = {
colorscheme_0: [],
colorscheme_1: [],
pattern: [],
ctx: null,
loadColorScheme: function( url ) {
this.reset2dPattern(); // 首先重排一下2d canvas的样式
fetch( './scripts/Color.json' ).then( res => {
return res.json().then( json => {
var data = json;
this.colorscheme_0 = data['Color_fantasy'][0].colors;
this.colorscheme_1 = data['Color_fantasy'][1].colors;
});
}).then( () => {
this.drawCanvas2d();
});
},
reset2dPattern: function( url ) {
var cWidth = 1024;
var cHeight = 512;
for( var i=0; i<2; ++i ) {
for( var j=0; j<2; ++j ) {
// 随机设定喷圈位置
var x = Math.random()*cWidth;
var y = Math.random()*cHeight;
// 随机设定喷圈尺寸
var radius_inner = Math.random() * 50 + 50;
var radius_outer = Math.random() * 300 + 200;
// 随机设定喷圈颜色索引
var indices = [ 0, 1, 2, 3, 4, 5 ];
var color_index_0 = this.pick(indices);
var color_index_1 = this.pick(indices);
var color_index_2 = this.pick(indices);
// 产生pattern子集
this.pattern.push({
x: x,
y: y,
radius_inner: radius_inner,
radius_outer: radius_outer,
color_indices: [ color_index_0, color_index_1, color_index_2 ]
})
}
}
},
drawCanvas2d: function() {
// 先绘制出背景底色
this.ctx = drawingCanvas.getContext( '2d' );
var grd = this.ctx.createLinearGradient( 0, 0, 0, 512 );
grd.addColorStop( 0.0, '#' + this.colorscheme_0[0] + 'ff' );
grd.addColorStop( 0.3, '#' + this.colorscheme_0[1] + 'ff' );
grd.addColorStop( 0.7, '#' + this.colorscheme_0[2] + 'ff' );
grd.addColorStop( 1.0, '#' + this.colorscheme_0[3] + 'ff' );
this.ctx.fillStyle = grd;
this.ctx.fillRect( 0, 0, 1024, 512 );
// 然后绘制主体圆圈颜色
for( var i=0; i<this.pattern.length; ++i ) {
var spray = this.pattern[i];
var grd = this.ctx.createRadialGradient( spray.x, spray.y, spray.radius_inner, spray.x, spray.y, spray.radius_outer);
var c1 = this.colorscheme_1[ spray.color_indices[0] ];
var c2 = this.colorscheme_1[ spray.color_indices[1] ];
var c3 = this.colorscheme_1[ spray.color_indices[2] ];
grd.addColorStop( 0.0, '#' + c1 );
grd.addColorStop( 0.2, '#' + c2 );
grd.addColorStop( 1.0, '#' + c3 + '00' );
this.ctx.fillStyle = grd;
this.ctx.fillRect( 0, 0, 1024, 512 );
}
},
pick: function( array ) {
var rand = Math.floor( Math.random()*array.length );
var result = array[rand];
array.splice( rand, 1 );
return result;
}
};
BaseCanvas2d.loadColorScheme();
function addCanvasDraw() {
var x = Math.random() * 1024;
var y = Math.random() * 512;
var radius_inner = Math.random() * 50 + 50;
var radius_outer = Math.random() * 100 + 400;
var grd = ctx.createRadialGradient( x, y, radius_inner, x, y, radius_outer);
var r1 = Math.floor( Math.random()*4 );
var r2 = Math.floor( Math.random()*4 );
var r3 = Math.floor( Math.random()*4 );
grd.addColorStop( 0.0, '#' + colors[r1] );
// grd.addColorStop( 0.3, '#' + colors[r2] );
// grd.addColorStop( 0.6, '#' + colors[r3] );
grd.addColorStop( 1.0, '#' + colors[r3] + '00' );
ctx.fillStyle = grd;
ctx.fillRect( 0, 0, 1024, 512 );
}
</script>
<script type="text/javascript">
var cameraRTT, camera, sceneRTT, sceneScreen, scene, renderer, zmesh1, zmesh2, stats, gui;
var frame = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var rtTexture, material, quad;
var params = {
color0 : '#9B50ED',
color1 : '#69D5FF',
color2 : '#FFBD6E',
color3 : '#FF77BC',
color4 : '#43FFB3',
color5 : '#5E71FF',
refreshColor : function() {
testRefreshColor();
},
resetPattern : function() {
testRefreshPattern();
}
};
init();
buildControls();
animate();
function init() {
// Renderer
renderer = new THREE.WebGLRenderer({ antialias: true, preserveDrawingBuffer: true });
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.autoClear = false;
container.appendChild( renderer.domElement );
// ---- Step 1 : rtTexture rendered
// ----
// camera rendering texture
cameraRTT = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, -10000, 10000 );
cameraRTT.position.z = 400;
// scene rendered to texture
sceneRTT = new THREE.Scene();
// render target texture
rtTexture = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, { minFilter: THREE.LinearFilter, magFilter: THREE.NearestFilter, format: THREE.RGBFormat } );
// things on the texture
canvasMaterial = new THREE.MeshBasicMaterial( {
map: new THREE.Texture( drawingcanvas ),
} );
var canvas = new THREE.Mesh( new THREE.PlaneBufferGeometry(window.innerWidth,window.innerHeight), canvasMaterial );
sceneRTT.add( canvas );
// ---- Step 2 : paint
// ----
// camera
camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, 0, 10000 );
camera.position.z = 2400;
// Scene
scene = new THREE.Scene();
scene.background = new THREE.Color(0x0099ff);
//
quad_geo = new THREE.PlaneGeometry( window.innerWidth, window.innerHeight, 99, 59 );
quad_mat = new THREE.ShaderMaterial( {
uniforms: {
tDiffuse: { value: rtTexture.texture },
uTime: { value: 0.0 }
},
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragment_shader_screen' ).textContent,
depthWrite: false,
// side: THREE.DoubleSide,
// wireframe: true
} );
scene.add( new THREE.Mesh( quad_geo, quad_mat ) );
// ---- Step 3 : Morphing the quad by Influence
// ----
ifl_01 = new Influence( 240, -200, 0, 900 );
ifl_01.surround( quad_geo );
ifl_01.moveTo( 260, 160, 400 );
ifl_02 = new Influence( -240, 200, 0, 900 );
ifl_02.surround( quad_geo );
ifl_02.moveTo( -260, -160, 400 );
// Controls
var controls = new THREE.OrbitControls( camera, renderer.domElement );
// Stats Info
stats = new Stats();
gui = new dat.GUI();
container.appendChild( stats.dom );
renderer.domElement.setAttribute('id','canvas_painter');
}
function animate() {
requestAnimationFrame( animate );
stats.update();
render();
}
function render() {
frame++;
var uTime = frame/50;
quad_mat.uniforms.uTime.value = uTime;
quad_mat.needsUpdate = true;
quad_geo.verticesNeedUpdate = true;
canvasMaterial.map.needsUpdate = true;
// render
renderer.clear();
renderer.render( sceneRTT, cameraRTT, rtTexture, true );
renderer.render( scene, camera );
}
function buildControls() {
//init GUI
var colorsgroup = gui.addFolder('Color Scheme');
colorsgroup.open();
colorsgroup.addColor( params, 'color0' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 0 ] = e.replace('#','')
});
colorsgroup.addColor( params, 'color1' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 1 ] = e.replace('#','')
});
colorsgroup.addColor( params, 'color2' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 2 ] = e.replace('#','')
});
colorsgroup.addColor( params, 'color3' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 3 ] = e.replace('#','')
});
colorsgroup.addColor( params, 'color4' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 4 ] = e.replace('#','')
});
colorsgroup.addColor( params, 'color5' ).onChange(function(e){
BaseCanvas2d.colorscheme_1[ 5 ] = e.replace('#','')
});
gui.add( params, 'refreshColor' );
gui.add( params, 'resetPattern' );
gui.open();
}
function downloadImage() {
console.log('downloading...')
// var imageData = canvas_painter.toDataURL("image/png").replace("image/png", "image/octet-stream");
var imageData = canvas_painter.toDataURL("image/png");
// Convert image to 'octet-stream' (Just a download, really)
// var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
// save_link.href = imageData;
// save_link.download = 'download.png';
// var event = document.createEvent('MouseEvents');
// event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
// save_link.dispatchEvent(event);
downloadCanvas();
}
var downloadCanvas = function(){
var link = document.createElement("a");
var imgData = canvas_painter.toDataURL({ format: 'png' });
var strDataURI = imgData.substr(22, imgData.length);
var blob = dataURLtoBlob(imgData);
var objurl = URL.createObjectURL(blob);
link.download = "helloWorld.png";
link.href = objurl;
link.click();
}
function dataURLtoBlob(dataurl) {
var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {type:mime});
}
</script>
</body>
</html>