{"id":134672,"date":"2020-07-08T17:29:37","date_gmt":"2020-07-08T09:29:37","guid":{"rendered":"http:\/\/4563.org\/?p=134672"},"modified":"2020-07-08T17:29:37","modified_gmt":"2020-07-08T09:29:37","slug":"%e7%91%9e%e6%95%b0%e7%9a%84-canvas-%e6%8c%87%e7%ba%b9%e5%92%8c%e9%9f%b3%e9%a2%91%e6%8c%87%e7%ba%b9%e4%bb%a3%e7%a0%81%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=134672","title":{"rendered":"\u745e\u6570\u7684 canvas \u6307\u7eb9\u548c\u97f3\u9891\u6307\u7eb9\u4ee3\u7801\u5206\u6790"},"content":{"rendered":"
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\u8cc7\u6df1\u5927\u4f6c : spiderGgl <\/span> <\/i> 6<\/span> <\/div>\n
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canvas \u6307\u7eb9\uff1a<\/p>\n

function getcanvas(){  try {   var canvasEle = window['document']['createElement']('canvas');   if (canvasEle && canvasEle['getContext']) {    canvasEle['width'] = 200;    canvasEle['height'] = 50;    canvas2d = canvasEle['getContext']('2d');    canvas2d['textBaseline'] = \"top\";    canvas2d['font'] = \"18px 'Arial'\";    canvas2d['fillStyle'] = '#f82';    canvas2d['fillRect'](0, 0, 100, 30);    canvas2d['fillStyle'] = '#17e';    canvas2d['fillText']('ActiveXObject', 3, 16);    canvas2d['fillStyle'] = 'rgba(240,110,53,0.4)';    canvas2d['fillText']('ActiveXObject', 5, 18);    imageBase64Str = canvasEle['toDataURL']();    console.log(imageBase64Str);   }  catch (err) {   \/\/ TODO \u5f02\u5e38\u64cd\u4f5c  } } <\/code><\/pre>\n
\u97f3\u9891\u6307\u7eb9\uff1a<\/p>\n
function audioContext(){  try {   var audioArr = [];   shaderSource1 =    'attribute vec2 attrVertex;varying vec2 varyinTexCoordinate;uniform vec2 uniformOffset;void main(){varyinTexCoordinate=attrVertex+uniformOffset;gl_Position=vec4(attrVertex,0,1);}';   shaderSource2 =    'precision mediump float;varying vec2 varyinTexCoordinate;void main() {gl_FragColor=vec4(varyinTexCoordinate,0,1);}';   var canvasEle = window['document']['createElement']('canvas');   var webGLRenderingContext = canvasEle.getContext('webgl');   createBuffer = webGLRenderingContext['createBuffer']();   webGLRenderingContext['bindBuffer'](webGLRenderingContext['ARRAY_BUFFER'], createBuffer);   _$ma = new window['Float32Array']([-.2, -.9, 0, .4, -.26, 0, 0, .813264543, 0]);   webGLRenderingContext['bufferData'](webGLRenderingContext['ARRAY_BUFFER'], _$ma, webGLRenderingContext['STATIC_DRAW']);   createBuffer['itemSize'] = 3;   createBuffer['numItems'] = 3;   createProgram = webGLRenderingContext['createProgram'](), vertex_shader = webGLRenderingContext['createShader'](webGLRenderingContext['VERTEX_SHADER']);   webGLRenderingContext['shaderSource'](vertex_shader, shaderSource1);   webGLRenderingContext['compileShader'](vertex_shader);   fragment_shader = webGLRenderingContext['createShader'](webGLRenderingContext['FRAGMENT_SHADER']);   webGLRenderingContext['shaderSource'](fragment_shader, shaderSource2);   webGLRenderingContext['compileShader'](fragment_shader);   webGLRenderingContext['attachShader'](createProgram, vertex_shader);   webGLRenderingContext['attachShader'](createProgram, fragment_shader);   webGLRenderingContext['linkProgram'](createProgram);   webGLRenderingContext['useProgram'](createProgram);   createProgram['vertexPosAttrib'] = webGLRenderingContext['getAttribLocation'](createProgram, 'attrVertex');   createProgram['offsetUniform'] = webGLRenderingContext['getUniformLocation'](createProgram, 'uniformOffset');   webGLRenderingContext['enableVertexAttribArray'](createProgram['vertexPosArray']);   webGLRenderingContext['vertexAttribPointer'](createProgram['vertexPosAttrib'], createBuffer['itemSize'], webGLRenderingContext['FLOAT'], !1, 0, 0);   webGLRenderingContext['uniform2f'](createProgram['offsetUniform'], 1, 1);   webGLRenderingContext['drawArrays'](webGLRenderingContext['TRIANGLE_STRIP'], 0, createBuffer['numItems']);   if (webGLRenderingContext['canvas'] != null) audioArr.push(webGLRenderingContext.canvas['toDataURL']());   if (webGLRenderingContext['getShaderPrecisionFormat']) {    vertex_shaders = [webGLRenderingContext['VERTEX_SHADER'], webGLRenderingContext['FRAGMENT_SHADER']], high_floats = [webGLRenderingContext['HIGH_FLOAT'], webGLRenderingContext['MEDIUM_FLOAT'],     webGLRenderingContext['LOW_FLOAT'], webGLRenderingContext['HIGH_INT'], webGLRenderingContext['MEDIUM_INT'], webGLRenderingContext['LOW_INT']    ];    for (h = 0; h < vertex_shaders.length; h++) {     for (i = 0; i < high_floats.length; i++) {      _$MO = webGLRenderingContext['getShaderPrecisionFormat'](vertex_shaders[h], high_floats[i]);      audioArr.push(_$MO['rangeMin'], _$MO['rangeMax'], _$MO['precision']);     }    }   }   console.log(audioArr);  } catch (err) {   \/\/ TODO \u5f02\u5e38\u64cd\u4f5c  } } <\/code><\/pre>\n<\/p><\/div>\n
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