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169 lines
3.5 KiB
169 lines
3.5 KiB
( function () {
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class Lut {
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constructor( colormap, numberofcolors ) {
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this.lut = [];
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this.setColorMap( colormap, numberofcolors );
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}
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set( value ) {
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if ( value instanceof Lut ) {
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this.copy( value );
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}
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return this;
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}
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setMin( min ) {
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this.minV = min;
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return this;
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}
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setMax( max ) {
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this.maxV = max;
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return this;
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}
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setColorMap( colormap, numberofcolors = 32 ) {
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this.map = ColorMapKeywords[ colormap ] || ColorMapKeywords.rainbow;
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this.n = numberofcolors;
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const step = 1.0 / this.n;
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this.lut.length = 0;
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for ( let i = 0; i <= 1; i += step ) {
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for ( let j = 0; j < this.map.length - 1; j ++ ) {
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if ( i >= this.map[ j ][ 0 ] && i < this.map[ j + 1 ][ 0 ] ) {
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const min = this.map[ j ][ 0 ];
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const max = this.map[ j + 1 ][ 0 ];
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const minColor = new THREE.Color( this.map[ j ][ 1 ] );
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const maxColor = new THREE.Color( this.map[ j + 1 ][ 1 ] );
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const color = minColor.lerp( maxColor, ( i - min ) / ( max - min ) );
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this.lut.push( color );
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}
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}
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}
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return this;
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}
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copy( lut ) {
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this.lut = lut.lut;
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this.map = lut.map;
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this.n = lut.n;
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this.minV = lut.minV;
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this.maxV = lut.maxV;
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return this;
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}
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getColor( alpha ) {
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if ( alpha <= this.minV ) {
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alpha = this.minV;
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} else if ( alpha >= this.maxV ) {
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alpha = this.maxV;
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}
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alpha = ( alpha - this.minV ) / ( this.maxV - this.minV );
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let colorPosition = Math.round( alpha * this.n );
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colorPosition == this.n ? colorPosition -= 1 : colorPosition;
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return this.lut[ colorPosition ];
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}
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addColorMap( colormapName, arrayOfColors ) {
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ColorMapKeywords[ colormapName ] = arrayOfColors;
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}
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createCanvas() {
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const canvas = document.createElement( 'canvas' );
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canvas.width = 1;
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canvas.height = this.n;
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this.updateCanvas( canvas );
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return canvas;
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}
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updateCanvas( canvas ) {
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const ctx = canvas.getContext( '2d', {
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alpha: false
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} );
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const imageData = ctx.getImageData( 0, 0, 1, this.n );
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const data = imageData.data;
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let k = 0;
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const step = 1.0 / this.n;
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for ( let i = 1; i >= 0; i -= step ) {
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for ( let j = this.map.length - 1; j >= 0; j -- ) {
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if ( i < this.map[ j ][ 0 ] && i >= this.map[ j - 1 ][ 0 ] ) {
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const min = this.map[ j - 1 ][ 0 ];
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const max = this.map[ j ][ 0 ];
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const minColor = new THREE.Color( this.map[ j - 1 ][ 1 ] );
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const maxColor = new THREE.Color( this.map[ j ][ 1 ] );
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const color = minColor.lerp( maxColor, ( i - min ) / ( max - min ) );
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data[ k * 4 ] = Math.round( color.r * 255 );
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data[ k * 4 + 1 ] = Math.round( color.g * 255 );
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data[ k * 4 + 2 ] = Math.round( color.b * 255 );
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data[ k * 4 + 3 ] = 255;
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k += 1;
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}
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}
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}
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ctx.putImageData( imageData, 0, 0 );
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return canvas;
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}
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}
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Lut.prototype.lut = [];
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Lut.prototype.map = [];
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Lut.prototype.n = 256;
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Lut.prototype.minV = 0;
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Lut.prototype.maxV = 1;
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const ColorMapKeywords = {
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'rainbow': [[ 0.0, 0x0000FF ], [ 0.2, 0x00FFFF ], [ 0.5, 0x00FF00 ], [ 0.8, 0xFFFF00 ], [ 1.0, 0xFF0000 ]],
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'cooltowarm': [[ 0.0, 0x3C4EC2 ], [ 0.2, 0x9BBCFF ], [ 0.5, 0xDCDCDC ], [ 0.8, 0xF6A385 ], [ 1.0, 0xB40426 ]],
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'blackbody': [[ 0.0, 0x000000 ], [ 0.2, 0x780000 ], [ 0.5, 0xE63200 ], [ 0.8, 0xFFFF00 ], [ 1.0, 0xFFFFFF ]],
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'grayscale': [[ 0.0, 0x000000 ], [ 0.2, 0x404040 ], [ 0.5, 0x7F7F80 ], [ 0.8, 0xBFBFBF ], [ 1.0, 0xFFFFFF ]]
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};
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THREE.ColorMapKeywords = ColorMapKeywords;
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THREE.Lut = Lut;
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} )();
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