Map tweaks

editor/client/public/map/map.js

@@ -41,16 +41,15 @@
     [ChunkTerrain.TILE_SHAPE_RAMP_SOUTHWEST_INNER]: { dx: -1, dy: 1 },
   };
 
-  // Draws an arrow centered at (cx, cy) pointing toward the ramp's high
-  // side, so ramp direction is visible at a glance on both the palette
-  // swatches and the tile grid.
-  function drawArrow(ctx, cx, cy, size, dx, dy) {
-    const mag = Math.hypot(dx, dy) || 1;
-    const ux = dx / mag, uy = dy / mag;
-    const len = size * 0.32;
-    const tipX = cx + ux * len, tipY = cy + uy * len;
-    const tailX = cx - ux * len, tailY = cy - uy * len;
+  const INNER_CORNER_SHAPES = new Set([
+    ChunkTerrain.TILE_SHAPE_RAMP_NORTHEAST_INNER,
+    ChunkTerrain.TILE_SHAPE_RAMP_NORTHWEST_INNER,
+    ChunkTerrain.TILE_SHAPE_RAMP_SOUTHEAST_INNER,
+    ChunkTerrain.TILE_SHAPE_RAMP_SOUTHWEST_INNER,
+  ]);
 
+  // Draws a single-headed arrow from (tailX, tailY) to (tipX, tipY).
+  function drawArrowSegment(ctx, tailX, tailY, tipX, tipY, size) {
     ctx.strokeStyle = "#ffffff";
     ctx.fillStyle = "#ffffff";
     ctx.lineWidth = Math.max(1, size * 0.08);
@@ -62,7 +61,7 @@
     ctx.stroke();
 
     const headLen = size * 0.18;
-    const angle = Math.atan2(uy, ux);
+    const angle = Math.atan2(tipY - tailY, tipX - tailX);
     const leftAngle = angle + Math.PI * 0.8;
     const rightAngle = angle - Math.PI * 0.8;
     ctx.beginPath();
@@ -73,6 +72,54 @@
     ctx.fill();
   }
 
+  // Draws an arrow centered at (cx, cy) pointing toward the ramp's high
+  // side, so ramp direction is visible at a glance on both the palette
+  // swatches and the tile grid. Used for cardinal ramps and outer-corner
+  // ramps (a single raised corner).
+  function drawArrow(ctx, cx, cy, size, dx, dy) {
+    const mag = Math.hypot(dx, dy) || 1;
+    const ux = dx / mag, uy = dy / mag;
+    const len = size * 0.32;
+    drawArrowSegment(ctx, cx - ux * len, cy - uy * len, cx + ux * len, cy + uy * len, size);
+  }
+
+  // Draws a plain right-angle bracket - two line segments meeting at 90
+  // degrees at the tile's corner, one running along each of the two edges
+  // adjacent to it - so inner-corner ramps (three corners raised, one
+  // dropped) read as "the adjacent sides meeting in a 90-degree corner",
+  // distinct from the single diagonal arrow used for outer-corner ramps.
+  function drawCornerBracket(ctx, cx, cy, size, dx, dy) {
+    const cornerDist = size * 0.42;
+    const armLen = size * 0.34;
+    const cornerX = cx + dx * cornerDist;
+    const cornerY = cy + dy * cornerDist;
+
+    ctx.strokeStyle = "#ffffff";
+    ctx.lineWidth = Math.max(1, size * 0.08);
+    ctx.lineCap = "round";
+    ctx.lineJoin = "round";
+
+    ctx.beginPath();
+    ctx.moveTo(cornerX - dx * armLen, cornerY);
+    ctx.lineTo(cornerX, cornerY);
+    ctx.lineTo(cornerX, cornerY - dy * armLen);
+    ctx.stroke();
+  }
+
+  // Draws the direction icon for a ramp tile `type` in a `size`x`size` area
+  // centered at (cx, cy): a diagonal arrow for cardinal/outer-corner ramps,
+  // or a right-angle bracket for inner-corner ramps. No-op for shapes with
+  // no direction (ground, erase).
+  function drawShapeIcon(ctx, cx, cy, size, type) {
+    const dir = SHAPE_DIRECTIONS[type];
+    if(!dir) return;
+    if(INNER_CORNER_SHAPES.has(type)) {
+      drawCornerBracket(ctx, cx, cy, size, dir.dx, dir.dy);
+    } else {
+      drawArrow(ctx, cx, cy, size, dir.dx, dir.dy);
+    }
+  }
+
   // Draws a small pencil icon centered in a `size`x`size` canvas.
   function drawPencilIcon(ctx, size) {
     ctx.save();
@@ -434,13 +481,12 @@
         buildPalette();
       });
 
-      const dir = SHAPE_DIRECTIONS[s.type];
-      if(dir) {
+      if(SHAPE_DIRECTIONS[s.type]) {
         const icon = document.createElement("canvas");
         icon.width = 32;
         icon.height = 32;
         icon.className = "tile-swatch-icon";
-        drawArrow(icon.getContext("2d"), 16, 16, 32, dir.dx, dir.dy);
+        drawShapeIcon(icon.getContext("2d"), 16, 16, 32, s.type);
         btn.appendChild(icon);
       }
 
@@ -500,8 +546,7 @@
         ctx.strokeStyle = "rgba(255, 255, 255, 0.25)";
         ctx.strokeRect(x * cell, sy, cell, cell);
 
-        const dir = SHAPE_DIRECTIONS[type];
-        if(dir) drawArrow(ctx, x * cell + cell / 2, sy + cell / 2, cell, dir.dx, dir.dy);
+        drawShapeIcon(ctx, x * cell + cell / 2, sy + cell / 2, cell, type);
       }
     }