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- Coordinates
- Using the drawing functions
dRectangle (Function) In french: dRectangle Draws a rectangle: - in an Image control,
- in a variable of type Image.
Remark: To draw custom rectangles, it is recommended to use dBorder. // Initialize the drawing in an Image control dStartDrawing(IMG_Drawing) Â // Draw a rectangle with a light yellow background // and light blue borders dRectangle(10, 10, 50, 50, LightYellow, LightBlue) Syntax
Drawing a rectangle by specifying the coordinates of rectangle Hide the details
dRectangle([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Background> [, <Line>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
<X1>: Integer X-coordinate (in pixels) of the upper-left corner of the rectangle. <Y1>: Integer Y-coordinate (in pixels) of the upper-left corner of the rectangle. <X2>: Integer X-coordinate (in pixels) of the lower-right corner of the rectangle. <Y2>: Integer Y-coordinate (in pixels) of the lower-right corner of the rectangle. <Background>: Integer, constant or Background variable (optional) - Background color of rectangle. This color can be:
- Background characteristics:
- characteristics specified in the last call to dBackground if this parameter is not specified.
<Line>: Integer, constant or Border variable (optional) - Color of rectangle line. This color can be:
- an RGB color (returned by RGB),
- an HSL color (returned by HSL),
- a WLanguage preset color,
- identical to the color used for the background if this parameter is not specified and if dPen has not been used.
- Characteristics of the line:
- characteristics specified in the last call to dPen if this parameter is not specified.
Remarks Coordinates Coordinates are specified with respect to the upper-left corner of the image or Image control (coordinates: (0,0)). Using the drawing functions The drawing functions can be used according to 2 methods: - Method 1: Using dStartDrawing
- dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or variable) to which the drawing functions will be applied.
- When drawing on an Image control:
- The drawing functions operate on a copy ("bitmap") of the image. You can use the drawing functions of Windows (via API or CallDLL32) but these functions must use the DC (Device Context) returned by dStartDrawing.
- dEndDrawing and dStartDrawing must not be called in the same process.
The drawing will not be displayed if dEndDrawing and dStartDrawing are called in the same process: it will be automatically erased.
- Method 2: indicating the drawing target directly in the syntax (via a parameter)
The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
Related Examples:
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Unit examples (WINDEV): The drawing functions
[ + ] Using the main drawing functions of WINDEV to: - Initialize an Image control for drawing - Draw simple shapes - Write a text into a drawing - Change the color in a drawing
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Business / UI classification: Neutral code
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