Interactive drawing of a circle.
draw_circle produces the parameter for a circle created interactive by the user in the window.
To create a circle you have to press the mouse button at the location which is used as the center of that circle. While keeping the mouse button pressed, the Radius's length can be modified through moving the mouse. After another mouse click in the created circle center you can move it. A clicking close to the circular arc you can modify the Radius of the circle. Pressing the right mousebutton terminates the procedure. After terminating the procedure the circle is not visible in the window any longer.
|
WindowHandle (input_control) |
window -> integer |
| Window_id. | |
|
Row (output_control) |
circle.center.y -> real |
| Barycenter's row index. | |
|
Column (output_control) |
circle.center.x -> real |
| Barycenter's column index. | |
|
Radius (output_control) |
circle.radius -> real |
| Circle's radius. | |
read_image(Image,'affe') draw_circle(WindowHandle,Row,Column,Radius) gen_circle(Circle,Row,Column,Radius,) reduce_domain(Image,Circle,GrayCircle) disp_image(GrayCircle,WindowHandle).
draw_circle returns 2 (H_MSG_TRUE) if the window is valid and the needed drawing mode (see set_insert) is available. If necessary, an exception handling is raised.
draw_circle is reentrant, local, and processed without parallelization.
reduce_domain, disp_region, set_colored, set_line_width, set_draw, set_insert
draw_circle_mod, draw_ellipse, draw_region
gen_circle, draw_rectangle1, draw_rectangle2, draw_polygon, set_insert
Foundation
