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draw images from heightmap

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Azgaar 2022-05-24 00:55:03 +03:00
parent c394534246
commit 27a045b709
3 changed files with 103 additions and 34 deletions
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55
modules/dynamic/heightmap-selection.js
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@ -41,6 +41,8 @@ const heightmaps = [
{id: "world-from-pacific", name: "World from Pacific"}
];
let seed = Math.floor(Math.random() * 1e9);
appendStyleSheet();
insertEditorHtml();
addListeners();
@ -109,11 +111,18 @@ function appendStyleSheet() {
color: #000;
}
.heightmap-selection article > div > span.icon-cw:active {
color: #666;
}
.heightmap-selection article > img {
width: 100%;
aspect-ratio: 16/9;
border-radius: 8px;
object-fit: cover;
}
img.heightmap-selection_precreated {
filter: contrast(1.3);
}
`;
@ -126,8 +135,12 @@ function appendStyleSheet() {
function insertEditorHtml() {
const templatesHtml = templates
.map(({id, name}) => {
return /* html */ `<article data-id="${id}">
<img src="../../heightmaps/europe.png" alt="${name}" loading="lazy" />
Math.random = aleaPRNG(seed);
const heights = HeightmapGenerator.fromTemplate(id);
const dataUrl = drawHeights(heights);
return /* html */ `<article data-id="${id}" data-seed="${seed}">
<img src="${dataUrl}" alt="${name}" />
<div>
${name}
<span data-tip="Regenerate preview" class="icon-cw"></span>
@ -139,7 +152,7 @@ function insertEditorHtml() {
const heightmapsHtml = heightmaps
.map(({id, name}) => {
return /* html */ `<article data-id="${id}">
<img src="../../heightmaps/${id}.png" alt="${name}" loading="lazy" />
<img src="../../heightmaps/${id}.png" alt="${name}" class="heightmap-selection_precreated" />
<div>${name}</div>
</article>`;
})
@ -168,7 +181,11 @@ function insertEditorHtml() {
function addListeners() {
byId("heightmapSelection").on("click", event => {
const article = event.target.closest("#heightmapSelection article");
if (article) setSelected(article.dataset.id);
if (!article) return;
const id = article.dataset.id;
if (event.target.matches("span.icon-cw")) regeneratePreview(article, id);
else setSelected(id);
});
}
@ -181,3 +198,33 @@ function setSelected(id) {
$heightmapSelection.querySelector(".selected")?.classList?.remove("selected");
$heightmapSelection.querySelector(`[data-id="${id}"]`)?.classList?.add("selected");
}
function drawHeights(heights) {
const canvas = document.createElement("canvas");
canvas.width = grid.cellsX;
canvas.height = grid.cellsY;
const ctx = canvas.getContext("2d");
const imageData = ctx.createImageData(grid.cellsX, grid.cellsY);
heights.forEach((height, i) => {
const h = height < 20 ? Math.max(height / 1.5, 0) : height;
const v = (h / 100) * 255;
imageData.data[i * 4] = v;
imageData.data[i * 4 + 1] = v;
imageData.data[i * 4 + 2] = v;
imageData.data[i * 4 + 3] = 255;
});
ctx.putImageData(imageData, 0, 0);
return canvas.toDataURL("image/png");
}
function regeneratePreview(article, id) {
seed = Math.floor(Math.random() * 1e9);
article.dataset.seed = seed;
Math.random = aleaPRNG(seed);
const heights = HeightmapGenerator.fromTemplate(id);
const dataUrl = drawHeights(heights);
article.querySelector("img").src = dataUrl;
}