| 摘要 |
PURPOSE:To form an arrow figure with a sharp arrowhead when the line width is enlarged by providing a coordinate composing means which composes the arrow figure by putting respective point coordinates of a polygon and respective vertex coordinates of segments. CONSTITUTION:This system is equipped with polygon coordinate calculating means 23 and 24 which specify the position coordinates of the arrow tip and calculate the coordinates of respective points of the polygon constituting a fletching part from the line width and fletching length of the fletching part and the open angle of the fletching, position coordinate calculating means 22 and 24 which calculate the position coordinates of the respective vertexes of the segments of the arrow figure other than the fletching, and coordinate composing means 21 and 24 which put the respective coordinates of the polygon and the respective vertex coordinates of the segments together to obtain the arrow figure. Then the arrow figure which has the sharp arrow tip when the line width is increased is obtained. Thus, the fletching part of the arrow figure is regarded as the polygon, the respective coordinates are found based upon the coordinates of the arrowhead, and the respective vertex coordinates of the segments other than the fletching are found; and those are put together to display the arrow figure which has the sharp arrowhead. |
