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127 lines
3.3 KiB
127 lines
3.3 KiB
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>查找表（[name]）</h1>
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<p class="desc">
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表示颜色表的查找表，用于从一个数据值的范围中确定颜色值。
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</p>
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<h2>代码示例</h2>
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<code>
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const lut = new Lut( 'rainbow', 512 );
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const color = lut.getColor( 0.5 );
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</code>
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<h2>构造函数</h2>
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<h3>[name]( [param:String colormap], [param:Number count] )</h3>
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<p>
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colormap - Sets a colormap from predefined colormaps. Available colormaps are: *rainbow*, *cooltowarm*, *blackbody*, *grayscale*. Default is *rainbow*.<br />
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count - Sets the number of colors used to represent the data array. Default is *32*.
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</p>
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<h2>属性</h2>
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<h3>[property:Array lut]</h3>
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<p>
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The lookup table for the selected color map represented as an array of [page:Color]s.
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</p>
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<h3>[property:Array map]</h3>
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<p>
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The currently selected color map. Default is the *rainbow* color map.
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</p>
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<h3>[property:Number minV]</h3>
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<p>
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The minimum value to be represented with the lookup table. Default is *0*.
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</p>
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<h3>[property:Number maxV]</h3>
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<p>
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The maximum value to be represented with the lookup table. Default is *1*.
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</p>
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<h3>[property:Number n]</h3>
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<p>
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The number of colors of the current selected color map. Default is *32*.
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</p>
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<h2>方法</h2>
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<h3>[method:this copy]( [param:Lut lut] ) [param:Lut this]</h3>
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<p>
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color — Lut to copy.
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</p>
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<p>
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Copies the given lut.
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</p>
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<h3>[method:this addColorMap]( [param:String name], [param:Array arrayOfColors] )</h3>
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<p>
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name — The name of the color map.<br />
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arrayOfColors — An array of color values. Each value is an array holding a threshold and the actual color value as a hexadecimal number.
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</p>
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<p>
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Adds a color map to this [name] instance.
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</p>
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<h3>[method:HTMLCanvasElement createCanvas]()</h3>
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<p>
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Creates a canvas in order to visualize the lookup table as a texture.
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</p>
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<h3>[method:Color getColor]( [param:Number alpha] )</h3>
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<p>
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value -- the data value to be displayed as a color.
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</p>
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<p>
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Returns an instance of [page:Color] for the given data value.
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</p>
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<h3>[method:this setColorMap]( [param:String colormap], [param:Number count] )</h3>
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<p>
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colormap — The name of the color map.<br />
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count — The number of colors. Default is *32*.
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</p>
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<p>
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Configure the lookup table for the given color map and number of colors.
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</p>
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<h3>[method:this setMin]( [param:Number minV] )</h3>
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<p>
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minV — The minimum value to be represented with the lookup table
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</p>
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<p>
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Sets this Lut with the minimum value to be represented.
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</p>
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<h3>[method:this setMax]( [param:Number maxV] )</h3>
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<p>
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maxV — The maximum value to be represented with the lookup table.
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</p>
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<p>
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Sets this Lut with the maximum value to be represented.
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</p>
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<h3>[method:HTMLCanvasElement updateCanvas]( [param:HTMLCanvasElement canvas] )</h3>
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<p>
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Updates the canvas with the [name]'s data.
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</p>
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<h2>源码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/math/Lut.js examples/jsm/math/Lut.js]
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</p>
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</body>
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</html>
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