webglimpse
Version:
Webglimpse is a data visualization library for the web.
74 lines • 10.2 kB
JavaScript
/*
* Copyright (c) 2014, Metron, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import { FloatDataTexture2D } from './texture';
// fills an array with jet colorscale values
// webgl does not support 1D textures, so a 2D texture must be used
export function jet(value) {
const x = 4.0 * value;
const r = clamp(1.5 - Math.abs(x - 3.0), 0, 1);
const g = clamp(1.5 - Math.abs(x - 2.0), 0, 1);
const b = clamp(1.5 - Math.abs(x - 1.0), 0, 1);
return [r, g, b, 1.0];
}
export function reverseBone(value) {
const x = 1 - 0.875 * value;
if (value < 0.375) {
return [x, x, x - value / 3, 1];
}
else if (value < 0.75) {
return [x, x + 0.125 - value / 3, x - 0.125, 1];
}
else {
return [x + 0.375 - value * 0.5, x - 0.125, x - 0.125, 1];
}
}
export function getGradientTexture(gradient, size = 1024) {
const array = new Float32Array(size * 4);
for (let v = 0; v < size; v++) {
const color = gradient(v / size);
array[4 * v + 0] = color[0];
array[4 * v + 1] = color[1];
array[4 * v + 2] = color[2];
array[4 * v + 3] = color[3];
}
return new FloatDataTexture2D(size, 1, array);
}
function clamp(n, min, max) {
if (n < min) {
return min;
}
else if (n > max) {
return max;
}
else {
return n;
}
}
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