Merge pull request #744 from Azgaar/predefined-heightmaps

Predefined heightmaps

heightmaps/import-rules.txt

@@ -0,0 +1,8 @@
+To get heightmap with correct height scale:
+1. Open tangrams.github.io
+2. Toggle off auto-exposure
+3. Set max elevation to 2000
+4. Set min elevation to -500
+5. Find region you like
+6. Render image
+7. Optionally rescale image to a smaller size (e.g. 500x300px) as high resolution is not used

index.html

@@ -162,14 +162,14 @@
       </g>
 
       <pattern id="oceanic" width="100" height="100" patternUnits="userSpaceOnUse">
-        <image id="oceanicPattern" href="./images/pattern1.png"></image>
+        <image id="oceanicPattern" href="./images/pattern1.png" opacity="0.2"></image>
       </pattern>
     </defs>
     <g id="viewbox"></g>
     <g id="scaleBar"></g>
     <g id="initial" opacity=1>
       <rect x="-1%" y="-1%" width="102%" height="102%" fill="#466eab"/>
-      <rect x="-1%" y="-1%" width="102%" height="102%" fill="url(#oceanic)" opacity=".2"/>
+      <rect x="-1%" y="-1%" width="102%" height="102%" fill="url(#oceanic)"/>
       <use href="#rose" id="init-rose" x="50%" y="50%"/>
     </g>
   </svg>
@@ -939,13 +939,14 @@
             </td>
           </tr>
 
-          <tr data-tip="Select template to be used for a Heightmap generation">
+          <tr data-tip="Select heightmap generation template or precreated heightmap">
             <td>
               <i data-locked=0 id="lock_template" class="icon-lock-open"></i>
             </td>
-            <td>Map template</td>
+            <td>Heightmap</td>
             <td>
               <select id="templateInput" data-stored="template">
+                <optgroup label="Template">
                   <option value="volcano">Volcano</option>
                   <option value="highIsland">High Island</option>
                   <option value="lowIsland">Low Island</option>
@@ -958,6 +959,32 @@
                   <option value="isthmus">Isthmus</option>
                   <option value="shattered">Shattered</option>
                   <option value="taklamakan">Taklamakan</option>
+                </optgroup>
+                <optgroup label="Specific">
+                  <option value="africa-centric">Africa Centric</option>
+                  <option value="arabia">Arabia</option>
+                  <option value="atlantics">Atlantics</option>
+                  <option value="britain">Britain</option>
+                  <option value="caribbean">Caribbean</option>
+                  <option value="east-asia">East Asia</option>
+                  <option value="eurasia">Eurasia</option>
+                  <option value="europe">Europe</option>
+                  <option value="europe-accented">Europe Accented</option>
+                  <option value="europe-and-central-asia">Europe and Central Asia</option>
+                  <option value="europe-central">Europe Central</option>
+                  <option value="europe-north">Europe North</option>
+                  <option value="greenland">Greenland</option>
+                  <option value="hellenica">Hellenica</option>
+                  <option value="iceland">Iceland</option>
+                  <option value="indian-ocean">Indian Ocean</option>
+                  <option value="mediterranean-sea">Mediterranean Sea</option>
+                  <option value="middle-east">Middle East</option>
+                  <option value="north-america">North America</option>
+                  <option value="us-centric">US-centric</option>
+                  <option value="us-mainland">US Mainland</option>
+                  <option value="world">World</option>
+                  <option value="world-from-pacific">World from Pacific</option>
+                </optgroup>
               </select>
             </td>
             <td></td>

main.js

@@ -2,7 +2,7 @@
 // https://github.com/Azgaar/Fantasy-Map-Generator
 
 "use strict";
-const version = "1.731"; // generator version
+const version = "1.732"; // generator version
 document.title += " v" + version;
 
 // switches to disable/enable logging features
@@ -192,15 +192,24 @@ if (!location.hostname) {
   d3.select("#loading-text").transition().duration(1000).style("opacity", 0);
   d3.select("#init-rose").transition().duration(4000).style("opacity", 0);
 } else {
+  hideLoading();
   checkLoadParameters();
+}
 
-  // remove loading screen
-  d3.select("#loading").transition().duration(4000).style("opacity", 0).remove();
-  d3.select("#initial").transition().duration(4000).attr("opacity", 0).remove();
+function hideLoading() {
+  d3.select("#loading").transition().duration(4000).style("opacity", 0);
+  d3.select("#initial").transition().duration(4000).attr("opacity", 0);
   d3.select("#optionsContainer").transition().duration(3000).style("opacity", 1);
   d3.select("#tooltip").transition().duration(4000).style("opacity", 1);
 }
 
+function showLoading() {
+  d3.select("#loading").transition().duration(200).style("opacity", 1);
+  d3.select("#initial").transition().duration(200).attr("opacity", 1);
+  d3.select("#optionsContainer").transition().duration(100).style("opacity", 0);
+  d3.select("#tooltip").transition().duration(200).style("opacity", 0);
+}
+
 // decide which map should be loaded or generated on page load
 function checkLoadParameters() {
   const url = new URL(window.location.href);
@@ -253,7 +262,7 @@ function checkLoadParameters() {
 
 async function generateMapOnLoad() {
   await applyStyleOnLoad(); // apply previously selected default or custom style
-  generate(); // generate map
+  await generate(); // generate map
   focusOn(); // based on searchParams focus on point, cell or burg from MFCG
   applyPreset(); // apply saved layers preset
 }
@@ -437,6 +446,7 @@ function showWelcomeMessage() {
   alertMessage.innerHTML = `The Fantasy Map Generator is updated up to version <strong>${version}</strong>.
     This version is compatible with ${changelog}, loaded <i>.map</i> files will be auto-updated.
     <ul><strong>Latest changes:</strong>
+      <li>Pre-defined heightmaps</li>
       <li>Advanced notes editor</li>
       <li>Zones editor: filter by type</li>
       <li>Color picker: new hatchings</li>
@@ -632,7 +642,7 @@ void (function addDragToUpload() {
   });
 })();
 
-function generate() {
+async function generate() {
   try {
     const timeStart = performance.now();
     invokeActiveZooming();
@@ -643,7 +653,7 @@ function generate() {
     placePoints();
     calculateVoronoi(grid, grid.points);
     drawScaleBar();
-    HeightmapGenerator.generate();
+    await HeightmapGenerator.generate();
     markFeatures();
     markupGridOcean();
     addLakesInDeepDepressions();
@@ -929,6 +939,31 @@ function defineMapSize() {
 
   function getSizeAndLatitude() {
     const template = document.getElementById("templateInput").value; // heightmap template
+
+    if (template === "africa-centric") return [45, 53];
+    if (template === "arabia") return [20, 35];
+    if (template === "atlantics") return [42, 23];
+    if (template === "britain") return [7, 20];
+    if (template === "caribbean") return [15, 40];
+    if (template === "east-asia") return [11, 28];
+    if (template === "eurasia") return [38, 19];
+    if (template === "europe") return [20, 16];
+    if (template === "europe-accented") return [14, 22];
+    if (template === "europe-and-central-asia") return [25, 10];
+    if (template === "europe-central") return [11, 22];
+    if (template === "europe-north") return [7, 18];
+    if (template === "greenland") return [22, 7];
+    if (template === "hellenica") return [8, 27];
+    if (template === "iceland") return [2, 15];
+    if (template === "indian-ocean") return [45, 55];
+    if (template === "mediterranean-sea") return [10, 29];
+    if (template === "middle-east") return [8, 31];
+    if (template === "north-america") return [37, 17];
+    if (template === "us-centric") return [66, 27];
+    if (template === "us-mainland") return [16, 30];
+    if (template === "world") return [78, 27];
+    if (template === "world-from-pacific") return [75, 32];
+
     const part = grid.features.some(f => f.land && f.border); // if land goes over map borders
     const max = part ? 80 : 100; // max size
     const lat = () => gauss(P(0.5) ? 40 : 60, 15, 25, 75); // latitude shift
@@ -1896,16 +1931,18 @@ function showStatistics() {
   INFO && console.log(stats);
 }
 
-const regenerateMap = debounce(function () {
+const regenerateMap = debounce(async function () {
   WARN && console.warn("Generate new random map");
+  showLoading();
   closeDialogs("#worldConfigurator, #options3d");
   customization = 0;
-  undraw();
   resetZoom(1000);
-  generate();
+  undraw();
+  await generate();
   restoreLayers();
   if (ThreeD.options.isOn) ThreeD.redraw();
   if ($("#worldConfigurator").is(":visible")) editWorld();
+  hideLoading();
 }, 1000);
 
 // clear the map

modules/heightmap-generator.js

@@ -3,13 +3,43 @@
 window.HeightmapGenerator = (function () {
   let cells, p;
 
-  const generate = function () {
-    TIME && console.time("generateHeightmap");
+  const generate = async function () {
     cells = grid.cells;
     p = grid.points;
     cells.h = new Uint8Array(grid.points.length);
 
-    const template = document.getElementById("templateInput").value;
+    const input = document.getElementById("templateInput");
+    const type = input.querySelector(`[value=${input.value}]`).parentElement.label;
+
+    if (type === "Specific") {
+      // pre-defined heightmap
+      TIME && console.time("defineHeightmap");
+      return new Promise(resolve => {
+        // create canvas where 1px correcponds to a cell
+        const canvas = document.createElement("canvas");
+        const ctx = canvas.getContext("2d");
+        const {cellsX, cellsY} = grid;
+        canvas.width = cellsX;
+        canvas.height = cellsY;
+
+        // load heightmap into image and render to canvas
+        const img = new Image();
+        img.src = `./heightmaps/${input.value}.png`;
+        img.onload = function () {
+          ctx.drawImage(img, 0, 0, cellsX, cellsY);
+          const imageData = ctx.getImageData(0, 0, cellsX, cellsY);
+          assignColorsToHeight(imageData.data);
+          canvas.remove();
+          img.remove();
+          TIME && console.timeEnd("defineHeightmap");
+          resolve();
+        };
+      });
+    }
+
+    // heightmap template
+    TIME && console.time("generateHeightmap");
+    const template = input.value;
     const templateString = HeightmapTemplates[template];
     const steps = templateString.split("\n");
 
@@ -79,8 +109,8 @@ window.HeightmapGenerator = (function () {
 
     function addOneHill() {
       const change = new Uint8Array(cells.h.length);
-      let limit = 0,
-        start;
+      let limit = 0;
+      let start;
       let h = lim(getNumberInRange(height));
 
       do {
@@ -410,5 +440,13 @@ window.HeightmapGenerator = (function () {
     return rand(min * length, max * length);
   }
 
+  function assignColorsToHeight(imageData) {
+    for (let i = 0; i < cells.i.length; i++) {
+      const lightness = imageData[i * 4] / 255;
+      const powered = lightness < 0.2 ? lightness : 0.2 + (lightness - 0.2) ** 0.8;
+      cells.h[i] = minmax(Math.floor(powered * 100), 0, 100);
+    }
+  }
+
   return {generate, addHill, addRange, addTrough, addStrait, addPit, smooth, modify};
 })();

modules/ui/heightmap-editor.js

@@ -913,11 +913,9 @@ function editHeightmap() {
 
     function uploadTemplate(dataLoaded) {
       const steps = dataLoaded.split("\r\n");
-      if (!steps.length) {
-        tip("Cannot parse the template, please check the file", false, "error");
-        return;
-      }
+      if (!steps.length) return tip("Cannot parse the template, please check the file", false, "error");
       templateBody.innerHTML = "";
+
       for (const s of steps) {
         const step = s.split(" ");
         if (step.length !== 5) {

modules/ui/options.js

@@ -306,10 +306,8 @@ function showSeedHistoryDialog() {
 
 // generate map with historical seed
 function restoreSeed(id) {
-  if (mapHistory[id].seed == seed) {
-    tip("The current map is already generated with this seed", null, "error");
-    return;
-  }
+  if (mapHistory[id].seed == seed) return tip("The current map is already generated with this seed", null, "error");
+
   optionsSeed.value = mapHistory[id].seed;
   mapWidthInput.value = mapHistory[id].width;
   mapHeightInput.value = mapHistory[id].height;
@@ -547,7 +545,7 @@ function randomizeOptions() {
 
   // 'Options' settings
   if (randomize || !locked("template")) randomizeHeightmapTemplate();
-  if (randomize || !locked("regions")) regionsInput.value = regionsOutput.value = gauss(15, 3, 2, 30);
+  if (randomize || !locked("regions")) regionsInput.value = regionsOutput.value = gauss(18, 5, 2, 30);
   if (randomize || !locked("provinces")) provincesInput.value = provincesOutput.value = gauss(20, 10, 20, 100);
   if (randomize || !locked("manors")) {
     manorsInput.value = 1000;