CanvasDrawPoint
int CanvasDrawPoint (int panelHandle, int controlID, Point point);
Purpose
Draws a point on the canvas control at a position you specify.
CanvasDrawPoint draws the point using the current value of the following attributes:
ATTR_PEN_COLOR
ATTR_PEN_MODE
ATTR_PEN_WIDTH
At pen widths of greater than one, the point might appear to be non-circular.
Supported Controls
You can use CanvasDrawPoint with canvas controls.
Parameters
| Input | ||
| Name | Type | Description |
| panelHandle | int | Specifier for a particular panel that is currently in memory. You can obtain this handle from functions such as LoadPanel and NewPanel. |
| controlID | int | The defined constant, located in the .uir header file, that you assigned to the control in the User Interface Editor, or the ID returned by functions such as NewCtrl and DuplicateCtrl. |
| point | Point | Point structure specifying the location at which to draw the point. The Point structure is defined as follows: typedef struct { int x; int y; } Point; You can create a Point without having to declare a variable by using the following function: Point MakePoint (int x, int y); ExampleCanvasDrawPoint (panelHandle, controlID, MakePoint (20, 30)); |
Return Value
| Name | Type | Description |
| status | int | Return value indicating whether the function was successful. A negative number indicates that an error occurred. |
Additional Information
Library: User Interface Library
Include file: userint.h
LabWindows/CVI compatibility: LabWindows/CVI 4.0 and later
Examples
Refer to the following examples that use the CanvasDrawPoint function:
- apps\iconedit\iconedit.cws
Open example - apps\life\life.cws
Open example - userint\canvas.cws
Open example