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feat: colorscale as HTML Canvas #17

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merged 2 commits into from
Dec 9, 2019
Merged

feat: colorscale as HTML Canvas #17

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e0eb9b4
feat: colorscale as HTML Canvas
NateBaldwinDesign Dec 9, 2019
7d39d6d
style: cleanup code in canvas generation
NateBaldwinDesign Dec 9, 2019
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38 changes: 29 additions & 9 deletions packages/ui/src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -467,6 +467,27 @@ function colorspaceOptions() {
chart2dColorspace.value = 'CAM02';
}

// Ramp function to create HTML canvas color scale
function ramp(color, n) {
n = window.innerHeight - 284;
let container = d3.select('#colorScale');
let canvas = container.append("canvas")
.attr("height", n)
.attr("width", 1);
let context = canvas.node().getContext("2d");

canvas.style.width = "40px";
canvas.style.imageRendering = "pixelated";
for (let i = 0; i < n; ++i) {
// only do this for actual colors
if(color[i] !== undefined) {
context.fillStyle = color[i]; // color[i / (n - 1)]
context.fillRect(0, i, 1, 1);
}
}
return canvas;
}

// Calculate Color and generate Scales
window.colorInput = colorInput;
function colorInput() {
Expand Down Expand Up @@ -512,6 +533,11 @@ function colorInput() {

// Generate scale data so we have access to all 3000 swatches to draw the gradient on the left
let scaleData = contrastColors.createScale({swatches: 3000, colorKeys: colorArgs, colorspace: mode, shift: shift});
let n = window.innerHeight - 282;
// let n = window.innerHeight - 84;
console.log(n);

let rampData = contrastColors.createScale({swatches: n, colorKeys: colorArgs, colorspace: mode, shift: shift});

newColors = contrastColors.generateContrastColors({colorKeys: colorArgs, base: background, ratios: ratioInputs, colorspace: mode, shift: shift});

Expand Down Expand Up @@ -560,15 +586,9 @@ function colorInput() {
swatch.style.backgroundColor = newColors[i];
}

// Generate Gradient
for (let i = 0; i < scaleData.colors.length; i++) {
var container = document.getElementById('colorScale');
var div = document.createElement('div');
div.className = 'colorScale-Item';
div.style.backgroundColor = scaleData.colors[i];

container.appendChild(div);
}
// Generate Gradient as HTML Canvas element
let filteredColors = rampData.colors;
ramp(filteredColors, n);

var backgroundR = d3.rgb(background).r;
var backgroundG = d3.rgb(background).g;
Expand Down