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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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40
modules/dynamic/heightmap-selection.js
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@ -199,10 +199,9 @@ function insertHtml() {
const name = heightmapTemplates[key].name;
Math.random = aleaPRNG(initialSeed);
const heights = HeightmapGenerator.fromTemplate(graph, key);
const dataUrl = drawHeights(heights);
return /* html */ `<article data-id="${key}" data-seed="${initialSeed}">
<img src="${dataUrl}" alt="${name}" />
<img src="${getHeightmapPreview(heights)}" alt="${name}" />
<div>
${name}
<span data-tip="Regenerate preview" class="icon-cw regeneratePreview"></span>
@ -266,42 +265,16 @@ function getGraph(currentGraph) {
return newGraph;
}
function drawHeights(heights) {
const canvas = document.createElement("canvas");
canvas.width = graph.cellsX;
canvas.height = graph.cellsY;
const ctx = canvas.getContext("2d");
const imageData = ctx.createImageData(graph.cellsX, graph.cellsY);
const scheme = getColorScheme(byId("heightmapSelectionColorScheme").value);
const renderOcean = byId("heightmapSelectionRenderOcean").checked;
const getHeight = height => (height < 20 ? (renderOcean ? height : 0) : height);
for (let i = 0; i < heights.length; i++) {
const color = scheme(1 - getHeight(heights[i]) / 100);
const {r, g, b} = d3.color(color);
const n = i * 4;
imageData.data[n] = r;
imageData.data[n + 1] = g;
imageData.data[n + 2] = b;
imageData.data[n + 3] = 255;
}
ctx.putImageData(imageData, 0, 0);
return canvas.toDataURL("image/png");
}
function drawTemplatePreview(id) {
const heights = HeightmapGenerator.fromTemplate(graph, id);
const dataUrl = drawHeights(heights);
const dataUrl = getHeightmapPreview(heights);
const article = byId("heightmapSelection").querySelector(`[data-id="${id}"]`);
article.querySelector("img").src = dataUrl;
}
async function drawPrecreatedHeightmap(id) {
const heights = await HeightmapGenerator.fromPrecreated(graph, id);
const dataUrl = drawHeights(heights);
const dataUrl = getHeightmapPreview(heights);
const article = byId("heightmapSelection").querySelector(`[data-id="${id}"]`);
article.querySelector("img").src = dataUrl;
}
@ -337,3 +310,10 @@ function confirmHeightmapEdit() {
onConfirm: () => editHeightmap({mode: "erase", tool})
});
}
function getHeightmapPreview(heights) {
const scheme = getColorScheme(byId("heightmapSelectionColorScheme").value);
const renderOcean = byId("heightmapSelectionRenderOcean").checked;
const dataUrl = drawHeights({heights, width: grid.cellsX, height: grid.cellsY, scheme, renderOcean});
return dataUrl;
}