From 3fa9ce81346be70365a4e44d7f908c9deb1af7e6 Mon Sep 17 00:00:00 2001
From: liihuu <hu_li888@foxmail.com>
Date: Thu, 30 May 2024 01:37:28 +0800
Subject: [PATCH] opt: opt line render

---
 src/extension/figure/line.ts | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/extension/figure/line.ts b/src/extension/figure/line.ts
index d1c918312..bf047b069 100644
--- 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()
     }