draw_rectangle1_modπ
Short descriptionπ
draw_rectangle1_mod β Draw a rectangle parallel to the coordinate axis.
Signatureπ
draw_rectangle1_mod( window WindowHandle, rectangle.origin.y Row1In, rectangle.origin.x Column1In, rectangle.corner.y Row2In, rectangle.corner.x Column2In, out rectangle.origin.y Row1, out rectangle.origin.x Column1, out rectangle.corner.y Row2, out rectangle.corner.x Column2 )
Descriptionπ
draw_rectangle1_mod returns the parameter for a rectangle parallel
to the coordinate axes, which has been created interactively by the user
in the window.
To create a rectangle are expected the parameters Row1In,
Column1In,Row2In and Column2In.
After a mouse click in the middle of the created rectangle you can move it.
A click close to one side βgripsβ it to modify the rectangleβs dimension in perpendicular
direction to this side. If you click on one corner of the created rectangle, you may
move this corner.
Pressing the right mouse button terminates the procedure.
After terminating the procedure the rectangle is not visible in the window any longer.
Attentionπ
If used in a buffer window, mouse events have to be supplied by the application, while the draw operator must be run in another thread.
Execution informationπ
Execution information
-
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
-
Multithreading scope: global (may be called from any thread).
-
Processed without parallelization.
Parametersπ
WindowHandle (input_control) window β (handle)
Window handle.
Row1In (input_control) rectangle.origin.y β (real)
Row index of the left upper corner.
Column1In (input_control) rectangle.origin.x β (real)
Column index of the left upper corner.
Row2In (input_control) rectangle.corner.y β (real)
Row index of the right lower corner.
Column2In (input_control) rectangle.corner.x β (real)
Column index of the right lower corner.
Row1 (output_control) rectangle.origin.y β (real)
Row index of the left upper corner.
Column1 (output_control) rectangle.origin.x β (real)
Column index of the left upper corner.
Row2 (output_control) rectangle.corner.y β (real)
Row index of the right lower corner.
Column2 (output_control) rectangle.corner.x β (real)
Column index of the right lower corner.
Exampleπ
(HDevelop)
read_image(Image,'monkey')
get_image_size (Image, Width, Height)
dev_display (Image)
draw_rectangle1_mod(WindowHandle,100,100,200,300,\
Row1,Column1,Row2,Column2)
dev_set_part (Row1, Column1, Row2, Column2)
dev_display (Image)
read_image(&Image,"monkey")\;
get_image_size(Image,&Width,&Height)\;
disp_image(Image,WindowHandle)\;
draw_rectangle1_mod(WindowHandle,100,100,200,300,
&Row1,&Column1,&Row2,&Column2)\;
set_part(WindowHandle,Row1,Column1,Row2,Column2)\;
disp_image(Image,WindowHandle)\;
Resultπ
draw_rectangle1_mod returns 2 (H_MSG_TRUE) if the window is valid.
If necessary, an exception is raised.
Combinations with other operatorsπ
Combinations
Possible predecessors
Possible successors
reduce_domain, disp_region, set_colored, set_line_width, set_draw
Alternatives
draw_rectangle1, draw_rectangle2, draw_region
See also
Moduleπ
Foundation