root
2 linhas
26 KiB
JavaScript
Arquivo Executável
2 linhas
26 KiB
JavaScript
Arquivo Executável
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vec2 a_position;\nattribute vec2 a_texCoord;\nuniform vec2 u_resolution;\nvarying vec2 v_texCoord;\nvoid main() {\n// convert the rectangle from pixels to 0.0 to 1.0\nvec2 zeroToOne = a_position / u_resolution;\n// convert from 0->1 to 0->2\nvec2 zeroToTwo = zeroToOne * 2.0;\n// convert from 0->2 to -1->+1 (clipspace)\nvec2 clipSpace = zeroToTwo - 1.0;\ngl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);\n// pass the texCoord to the fragment shader\n// The GPU will interpolate this value between points.\nv_texCoord = a_texCoord;\n}",g="precision mediump float;\n// our textur\nuniform sampler2D u_textureData;\nuniform sampler2D u_textureScale;\nuniform vec2 u_textureSize;\nuniform vec2 u_domain;\nuniform float u_noDataValue;\nuniform bool u_clampLow;\nuniform bool u_clampHigh;\n// the texCoords passed in from the vertex shader.\nvarying vec2 v_texCoord;\nvoid main() {\nvec2 onePixel = vec2(1.0, 1.0) / u_textureSize;\nfloat value = texture2D(u_textureData, v_texCoord)[0];\nif (value == u_noDataValue)\ngl_FragColor = vec4(0.0, 0, 0, 0.0);\nelse if ((!u_clampLow && value < u_domain[0]) || (!u_clampHigh && value > u_domain[1]))\ngl_FragColor = vec4(0, 0, 0, 0);\nelse {\nfloat normalisedValue = (value - u_domain[0]) / (u_domain[1] - u_domain[0]);\ngl_FragColor = texture2D(u_textureScale, vec2(normalisedValue, 0));\n}\n}",h=function(a){this.datasetCollection={},this.currentDataset=null,this.setCanvas(a.canvas);var d;if(b(a.useWebGL,!0)&&(d=c(this.canvas))){this.gl=d;var e=d.createShader(d.VERTEX_SHADER);if(d.shaderSource(e,f),d.compileShader(e),!d.getShaderParameter(e,d.COMPILE_STATUS))throw new Error(d.getShaderInfoLog(e));var h=d.createShader(d.FRAGMENT_SHADER);if(d.shaderSource(h,g),d.compileShader(h),!d.getShaderParameter(h,d.COMPILE_STATUS))throw new Error(d.getShaderInfoLog(h));var i=this.program=d.createProgram();d.attachShader(i,e),d.attachShader(i,h),d.linkProgram(i),d.useProgram(this.program);var j=d.getAttribLocation(i,"a_texCoord");this.texCoordBuffer=d.createBuffer(),d.bindBuffer(d.ARRAY_BUFFER,this.texCoordBuffer),d.bufferData(d.ARRAY_BUFFER,new Float32Array([0,0,1,0,0,1,0,1,1,0,1,1]),d.STATIC_DRAW),d.enableVertexAttribArray(j),d.vertexAttribPointer(j,2,d.FLOAT,!1,0,0)}else this.ctx=this.canvas.getContext("2d");if(a.colorScaleImage?this.setColorScaleImage(a.colorScaleImage):this.setColorScale(b(a.colorScale,"viridis")),this.setDomain(b(a.domain,[0,1])),this.setClamp(b(a.clampLow,!0),a.clampHigh),this.setNoDataValue(a.noDataValue),a.data){var k=a.data.length;this.setData(a.data,b(a.width,a.data[k-2]),b(a.height,a.data[k-2]))}if(a.datasets)for(var l=0;l<a.datasets.length;++l){var m=a.datasets[l];this.addDataset(m.id,m.data,m.width,m.height)}};h.prototype.getData=function(){var a=this.currentDataset;if(!a)throw new Error("No dataset available.");return a.data},h.prototype.atPoint=function(a,b){var c=this.currentDataset;if(!c)throw new Error("No dataset available.");if(a>=c.width||b>=c.height)throw new Error("Coordinates are outside of image bounds.");return c.data[b*c.width+a]};var i=function(a,b,c,d,e){var f;return a&&(a.viewport(0,0,d,e),f=a.createTexture(),a.bindTexture(a.TEXTURE_2D,f),a.texParameteri(a.TEXTURE_2D,a.TEXTURE_WRAP_S,a.CLAMP_TO_EDGE),a.texParameteri(a.TEXTURE_2D,a.TEXTURE_WRAP_T,a.CLAMP_TO_EDGE),a.texParameteri(a.TEXTURE_2D,a.TEXTURE_MIN_FILTER,a.NEAREST),a.texParameteri(a.TEXTURE_2D,a.TEXTURE_MAG_FILTER,a.NEAREST),a.texImage2D(a.TEXTURE_2D,0,a.LUMINANCE,d,e,0,a.LUMINANCE,a.FLOAT,new Float32Array(c))),{textureData:f,width:d,height:e,data:c,id:b}};h.prototype.setData=function(a,b,c){this.currentDataset&&null===this.currentDataset.id&&j(this.gl,this.currentDataset),this.currentDataset=i(this.gl,null,a,b,c)},h.prototype.addDataset=function(a,b,c,d){if(this.datasetAvailable(a))throw new Error("There is already a dataset registered with id '"+a+"'");this.datasetCollection[a]=i(this.gl,a,b,c,d),this.currentDataset||(this.currentDataset=this.datasetCollection[a])},h.prototype.setCurrentDataset=function(a){if(!this.datasetAvailable(a))throw new Error("No such dataset registered: '"+a+"'");this.currentDataset&&null===this.currentDataset.id&&j(this.gl,this.currentDataset),this.currentDataset=this.datasetCollection[a]};var j=function(a,b){a&&a.deleteTexture(b.textureData)};h.prototype.removeDataset=function(a){var b=this.datasetCollection[a];if(!b)throw new Error("No such dataset registered: '"+a+"'");j(this.gl,b),this.currentDataset===b&&(this.currentDataset=null),delete this.datasetCollection[a]},h.prototype.datasetAvailable=function(b){return a(this.datasetCollection,b)},h.prototype.getColorScaleImage=function(){return this.colorScaleImage},h.prototype.setCanvas=function(a){this.canvas=a||document.createElement("canvas")},h.prototype.getCanvas=function(){return this.canvas},h.prototype.setDomain=function(a){if(!a||2!==a.length)throw new Error("Invalid domain specified.");this.domain=a};var k=function(a,b,c){if(b.length!==c.length)throw new Error("Invalid color scale.");e[a]={colors:b,positions:c}},l=function(a,b){var c=e[a];b.height=1;var d=b.getContext("2d");if("[object Object]"===Object.prototype.toString.call(c)){b.width=256;for(var f=d.createLinearGradient(0,0,256,1),g=0;g<c.colors.length;++g)f.addColorStop(c.positions[g],c.colors[g]);d.fillStyle=f,d.fillRect(0,0,256,1)}else{if("[object Uint8Array]"!==Object.prototype.toString.call(c))throw new Error("Color scale not defined.");b.width=256;var h=d.createImageData(256,1);h.data.set(c),d.putImageData(h,0,0)}};return h.prototype.setColorScale=function(b){if(!a(e,b))throw new Error("No such color scale '"+b+"'");this.colorScaleCanvas||(this.colorScaleCanvas=document.createElement("canvas"),this.colorScaleCanvas.width=256,this.colorScaleCanvas.height=1),l(b,this.colorScaleCanvas),this.name=b,this.setColorScaleImage(this.colorScaleCanvas)},h.prototype.setColorScaleImage=function(a){this.colorScaleImage=a;var b=this.gl;b&&(this.textureScale&&b.deleteTexture(this.textureScale),this.textureScale=b.createTexture(),b.bindTexture(b.TEXTURE_2D,this.textureScale),b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_S,b.CLAMP_TO_EDGE),b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_T,b.CLAMP_TO_EDGE),b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MIN_FILTER,b.NEAREST),b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MAG_FILTER,b.NEAREST),b.texImage2D(b.TEXTURE_2D,0,b.RGBA,b.RGBA,b.UNSIGNED_BYTE,a))},h.prototype.setClamp=function(a,b){this.clampLow=a,this.clampHigh="undefined"!=typeof b?b:a},h.prototype.setNoDataValue=function(a){this.noDataValue=a},h.prototype.render=function(){var a=this.canvas,b=this.currentDataset;if(a.width=b.width,a.height=b.height,this.gl){var c=this.gl;c.viewport(0,0,b.width,b.height),c.useProgram(this.program),c.uniform1i(c.getUniformLocation(this.program,"u_textureData"),0),c.uniform1i(c.getUniformLocation(this.program,"u_textureScale"),1),c.activeTexture(c.TEXTURE0),c.bindTexture(c.TEXTURE_2D,b.textureData),c.activeTexture(c.TEXTURE1),c.bindTexture(c.TEXTURE_2D,this.textureScale);var e=c.getAttribLocation(this.program,"a_position"),f=c.getUniformLocation(this.program,"u_domain"),g=c.getUniformLocation(this.program,"u_resolution"),h=c.getUniformLocation(this.program,"u_noDataValue"),i=c.getUniformLocation(this.program,"u_clampLow"),j=c.getUniformLocation(this.program,"u_clampHigh");c.uniform2f(g,a.width,a.height),c.uniform2fv(f,this.domain),c.uniform1i(i,this.clampLow),c.uniform1i(j,this.clampHigh),c.uniform1f(h,this.noDataValue);var k=c.createBuffer();c.bindBuffer(c.ARRAY_BUFFER,k),c.enableVertexAttribArray(e),c.vertexAttribPointer(e,2,c.FLOAT,!1,0,0),d(c,0,0,a.width,a.height),c.drawArrays(c.TRIANGLES,0,6)}else if(this.ctx){for(var l,m=this.ctx,n=a.width,o=a.height,p=m.createImageData(n,o),q=this.domain[1]-this.domain[0],r=this.colorScaleCanvas.width,s=this.colorScaleCanvas.getContext("2d").getImageData(0,0,r,1).data,t=b.data,u=0;o>u;u++)for(var v=0;n>v;v++){var w=u*n+v,x=4*(u*n+v),y=Math.round((t[w]-this.domain[0])/q*r);l=255,0>y?(y=0,this.clampLow||(l=0)):y>255&&(y=255,this.clampHigh||(l=0)),t[w]===this.noDataValue&&(l=0),p.data[x+0]=s[4*y],p.data[x+1]=s[4*y+1],p.data[x+2]=s[4*y+2],p.data[x+3]=l}m.putImageData(p,0,0)}},h.prototype.renderDataset=function(a){return this.setCurrentDataset(a),this.render()},h.prototype.getColor=function(a){var b=this.colorScaleCanvas.width,c=this.colorScaleCanvas.getContext("2d").getImageData(0,0,b,1).data,d=this.domain[1]-this.domain[0],e=Math.round((a-this.domain[0])/d*b),f=255;return 0>e&&(e=0,this.clampLow||(f=0)),e>255&&(e=255,this.clampHigh||(f=0)),[c[4*e],c[4*e+1],c[4*e+2],f]},{plot:h,addColorScale:k,colorscales:e,renderColorScaleToCanvas:l}}();"undefined"!=typeof module&&(module.exports=plotty);
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