| 摘要 |
PURPOSE:To form a perspective drawing while displaying the coordinates of a straight line passing a focus by forming a cursor which can be moved in a window for displaying a part of a screen face after specification while being restricted by an optional one-dimension in an affine coordinate system and displaying affine coordinates. CONSTITUTION:A computer 1 executes operation, storage and I/O processing and a CRT 2 displays a graphic window 5, a command menu 6, and so on. Function keys F1 to F7 are used for inputting a specific command for forming a perspective drawing. While observing the CRT 2, relation among an optional three-dimensional affine coordinate system, the screen face and a visual point is specified through the computer 1 by operating a keyboard 3 and a mouse 4, and after the specification, the cursor is moved in the window 5 for displaying a part of the screen face while being restricted by an optional onedimension in the affine coordinate system and displaying affine coordinates. Consequently a perspective drawing can be formed while displaying the coordinates of a straight line passing the focus. |
