70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
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var cmap = require('.'),
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img = document.body.appendChild(document.createElement('img')),
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canvas = document.body.appendChild(document.createElement('canvas')),
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c = canvas.getContext('2d'),
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n = 48,
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colormaps = [
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'jet', 'hsv','hot','cool','spring','summer','autumn','winter','bone',
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'copper','greys','YIGnBu','greens','YIOrRd','bluered','RdBu','picnic',
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'rainbow','portland','blackbody','earth','electric',
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'viridis', 'inferno', 'magma', 'plasma', 'warm', 'cool', 'rainbow-soft',
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'bathymetry', 'cdom', 'chlorophyll', 'density', 'freesurface-blue', 'freesurface-red', 'oxygen', 'par', 'phase', 'salinity', 'temperature', 'turbidity', 'velocity-blue', 'velocity-green',
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'cubehelix'
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];
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img.width = 480;
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img.onload = run;
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img.src = './night.jpg'
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function drawColorMaps (colormap, name, height) {
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/*
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* Build up the color ranges and add text
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*/
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for (var j = 0; j < n; j++) {
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c.fillStyle = colormap[j]; // start ind at index 0
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c.fillRect(j*10, height, 10, 40);
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}
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c.fillStyle = '#262626';
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c.font = '16px Helvetica';
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c.fillText( name, n*10 + 10, height + 26);
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}
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function run() {
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var height, colormap;
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c.canvas.height = colormaps.length * 40 + img.height;
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c.canvas.width = 648;
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for (var i = 0; i < colormaps.length; i++) {
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height = i*40;
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colormap = cmap({
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colormap: colormaps[i],
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nshades: n,
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format: 'rgbaString'
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});
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drawColorMaps(colormap, colormaps[i], height);
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}
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/*
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* Now lets try some alpha maps overtop an image!
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*/
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var ilast = i;
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c.drawImage(img, 0, i*40, 480, 240);
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// remove background img
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img.parentElement.removeChild(img);
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for (var i = 0; i < colormaps.length; i++) {
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height = (ilast + i)*40;
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colormap = cmap({
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colormap: colormaps[i],
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nshades: n,
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format: 'rgbaString',
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alpha: [0, 1]
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});
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drawColorMaps(colormap, colormaps[i] + ' with transparency', height);
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}
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}
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