# CanvasInvertRect

int CanvasInvertRect (int panelHandle, int controlID, Rect rect);

## Purpose

Inverts the colors in the specified rectangular area of a canvas control.

The resulting colors depend on the operating system. If you invert the same rectangle twice, you are guaranteed to get the original colors back.

## Parameters

Input
Name | Type | Description
panelHandle | integer | Specifier for a particular panel that is currently in memory. You obtain this handle from LoadPanel, NewPanel, or DuplicatePanel.
controlID | integer | 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 NewCtrl or DuplicateCtrl.
rect | Rect | Rect structure that specifies the location and size of the rectangular area in which to invert the colors. Use VAL_ENTIRE_OBJECT to specify the entire canvas. The Rect structure is defined as follows: typedef struct { int top; int left; int height; int width; } Rect; You can create a Rect without having to declare a variable by using the following function: Rect MakeRect (int top, int left, int height, int width); Example CanvasInvertRect (panelHandle, controlID, MakeRect(20,30,150,200));

## Return Value

Name | Type | Description
status | integer | Return value indicating whether the function was successful. A negative number indicates that an error occurred.
Code | Error Message String
xx | Success