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标准箭头绘制方式修改

haojianlong 4 years ago
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commit
8c17a32741
1 changed files with 3 additions and 7 deletions
  1. 3 7
      docs/dev/saga-graphy/graphy-engine/arrow.md

+ 3 - 7
docs/dev/saga-graphy/graphy-engine/arrow.md

@@ -18,17 +18,13 @@
 
 1.将canvas坐标转换为数学坐标系坐标,将纵坐标取反即可;
 
-2.将坐标系平移至线段点;
+2.将坐标系平移至线段点;
 
 3.计算出线段与x轴夹角,并将坐标系旋转至x轴与线段重合;
 
-4.将坐标系平移至终点;
+4.设定箭头夹角为θ=π/3,末端三角形边长d=5,则箭头上下端与x轴夹角为π/6,根据此角度与边长计算上下端坐标;
 
-5.设定箭头夹角为θ=90°,末端三角形边长d=6,则箭头上端与x轴夹角为π-θ/2,箭头下端与x轴夹角为π+θ/2,根据此角度与边长计算上下端坐标;
-
-6.将计算出的坐标依次转换为数学坐标系坐标和canvas坐标系坐标;
-
-7.根据终点坐标,以及以上计算出的坐标即可绘制三角形末端;
+5.直接绘制原点与上下端连线即可
 
 ### 三角形