opt: opt line render

klinecharts · May 29, 2024 · 3fa9ce8 · 3fa9ce8
1 parent a2c1977
commit 3fa9ce8
Showing 1 changed file with 16 additions and 2 deletions.
diff --git a/src/extension/figure/line.ts b/src/extension/figure/line.ts
@@ -152,8 +152,22 @@ export function drawLine (ctx: CanvasRenderingContext2D, attrs: LineAttrs | Line
   lines.forEach(({ coordinates }) => {
     if (coordinates.length > 1) {
       ctx.beginPath()
-      ctx.moveTo(coordinates[0].x, coordinates[0].y)
-      lineTo(ctx, coordinates, smooth)
+      if (coordinates.length === 2) {
+        const correction = (size % 2 === 1) ? 0.5 : 0
+        if (coordinates[0].x === coordinates[1].x) {
+          ctx.moveTo(coordinates[0].x + correction, coordinates[0].y)
+          ctx.lineTo(coordinates[1].x + correction, coordinates[1].y)
+        } else if (coordinates[0].y === coordinates[1].y) {
+          ctx.moveTo(coordinates[0].x, coordinates[0].y + correction)
+          ctx.lineTo(coordinates[1].x, coordinates[1].y + correction)
+        } else {
+          ctx.moveTo(coordinates[0].x, coordinates[0].y)
+          ctx.lineTo(coordinates[1].x, coordinates[1].y)
+        }
+      } else {
+        ctx.moveTo(coordinates[0].x, coordinates[0].y)
+        lineTo(ctx, coordinates, smooth)
+      }
       ctx.stroke()
       ctx.closePath()
     }