角度计算方式：将直线看作向量（有方向性），以直线与水平轴的交点为起点（旋转中心）。如果终点在水平轴上方，则夹角为逆时针旋转水平轴到向量的角度（带正号）。如果终点在水平轴下方，则夹角为顺时针旋转水平轴到向量的角度（带负号）。结果取决于定义线条的两点的顺序。

角度表示方式：弧度，-π<=Angle<π

dev_close_window() dev_open_window (0, 0, 512, 512, 'black', WindowHandle) Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row1, Col1, 25, 15) dev_set_color ('yellow') gen_region_line (ROI_0, 350, 100, 350, 750) XRowHalf := 350 XColHalf := (100 + 700)/2 gen_arrow_contour_xld (Arrow, XRowHalf, XColHalf,350, 750, 25, 15) angle_lx (Row2, Col2, Row1, Col1, Angle) disp_message (WindowHandle, '红色线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true') disp_message (WindowHandle, 'X', 'Image', 345, 765, 'yellow', 'false') stop() dev_clear_window() Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row2, Col2, 25, 15) dev_set_color ('yellow') gen_region_line (ROI_0, 350, 100, 350, 750) XRowHalf := 350 XColHalf := (100 + 700)/2 gen_arrow_contour_xld (Arrow, XRowHalf, XColHalf,350, 750, 25, 15) angle_lx (Row1, Col1,Row2, Col2, Angle) disp_message (WindowHandle, '红色线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true') disp_message (WindowHandle, 'X', 'Image', 345, 765, 'yellow', 'false')

角度计算方式：该算子计算原理与angle_lx类似，只不过把水平轴替换为任意直线B

角度表示方式：弧度，-π<=Angle<=π

讯享网dev_close_window() dev_open_window (0, 0, 512, 512, 'black', WindowHandle) set_display_font (WindowHandle, 26, 'mono', 'true', 'false') Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 Row3 := 400 Col3 := 100 Row4 := 100 Col4 := 500 Row2Half := (Row3 + Row4)/2 Col2Half := (Col3 + Col4)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row1, Col1, 25, 15) dev_set_color ('blue') gen_region_line (RegionLines, Row3, Col3, Row4, Col4) gen_arrow_contour_xld (Arrow1, Row2Half, Col2Half, Row3, Col3, 25, 15) angle_ll (Row4, Col4,Row3, Col3, Row2, Col2,Row1, Col1, Angle) disp_message (WindowHandle, '蓝色线转向红色线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true') stop() dev_clear_window() Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 Row3 := 400 Col3 := 100 Row4 := 100 Col4 := 500 Row2Half := (Row3 + Row4)/2 Col2Half := (Col3 + Col4)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row1, Col1, 25, 15) dev_set_color ('blue') gen_region_line (RegionLines, Row3, Col3, Row4, Col4) gen_arrow_contour_xld (Arrow1, Row2Half, Col2Half, Row4, Col4, 25, 15) angle_ll (Row3, Col3, Row4, Col4, Row2, Col2,Row1, Col1, Angle) disp_message (WindowHandle, '蓝色线转向红色线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true') stop() dev_clear_window() Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 Row5 := 250 Col5 := 20 Row6 := 250 Col6 := 550 Row3Half := (Row5 + Row6)/2 Col3Half := (Col5 + Col6)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row1, Col1, 25, 15) dev_set_color ('yellow') gen_region_line (RegionLines, Row5, Col5, Row6, Col6) gen_arrow_contour_xld (Arrow1, Row3Half, Col3Half, Row6, Col6, 25, 15) angle_ll (Row2, Col2,Row1, Col1,Row5, Col5, Row6, Col6, Angle) disp_message (WindowHandle, '红色线转向黄**线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true') stop() dev_clear_window() Row1 := 100 Col1 := 100 Row2 := 500 Col2 := 600 Row1Half := (Row1 + Row2)/2 Col1Half := (Col1 + Col2)/2 Row5 := 250 Col5 := 20 Row6 := 250 Col6 := 550 Row3Half := (Row5 + Row6)/2 Col3Half := (Col5 + Col6)/2 dev_set_color ('red') gen_region_line (RegionLines, Row1, Col1, Row2, Col2) gen_arrow_contour_xld (Arrow1, Row1Half, Col1Half, Row1, Col1, 25, 15) dev_set_color ('yellow') gen_region_line (RegionLines, Row5, Col5, Row6, Col6) gen_arrow_contour_xld (Arrow1, Row3Half, Col3Half, Row6, Col6, 25, 15) angle_ll (Row5, Col5, Row6, Col6, Row2, Col2,Row1, Col1, Angle) disp_message (WindowHandle, '黄色线转向红色线角度为：' + deg(Angle), 'window', 12, 12, 'black', 'true')

讯享网

角度计算方式：当直线（无方向性）大致位于1、3象限的方向，角度为正。当直线大致位于2、4象限的方向，角度为负。

角度表示方式：弧度，-π/2<Phi<=π/2

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参考文献

Halcon的angle_ll和angle_lx角度的解析 - 木乔ni - 博客园