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Custom heightmap color scheme (#1013)

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* feat: custom heightmap color scheme

* feat: custom heightmap color scheme - add shceme on load

---------

Co-authored-by: Azgaar <azgaar.fmg@yandex.com>
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Azgaar 2023-11-18 16:34:41 +04:00 • committed by GitHub
parent 778bea15ee
commit 958a2c6ef8
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10 changed files with 216 additions and 64 deletions
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27
utils/graphUtils.js
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@ -325,7 +325,7 @@ function drawCellsValue(data) {
.text(d => d);
}
// helper function non-used for the generation
// helper function non-used for the main generation
function drawPolygons(data) {
const max = d3.max(data),
min = d3.min(data),
@ -342,3 +342,28 @@ function drawPolygons(data) {
.attr("fill", d => scheme(d))
.attr("stroke", d => scheme(d));
}
// draw raster heightmap preview (not used in main generation)
function drawHeights({heights, width, height, scheme, renderOcean}) {
const canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext("2d");
const imageData = ctx.createImageData(width, height);
const getHeight = height => (height < 20 ? (renderOcean ? height : 0) : height);
for (let i = 0; i < heights.length; i++) {
const color = scheme(1 - getHeight(heights[i]) / 100);
const {r, g, b} = d3.color(color);
const n = i * 4;
imageData.data[n] = r;
imageData.data[n + 1] = g;
imageData.data[n + 2] = b;
imageData.data[n + 3] = 255;
}
ctx.putImageData(imageData, 0, 0);
return canvas.toDataURL("image/png");
}