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- Coordinates
- Using the drawing functions
dPoint (Function) In french: dPoint Draws a point: - in an Image control,
- in a variable of type Image.
// Initialize the drawing in an Image control dStartDrawing(IMG_Drawing) // Draw a point in light yellow dPoint(10, 50, LightYellow) Syntax
Drawing a point by specifying its coordinates Hide the details
dPoint([<Image>, ] <X-coordinate> , <Y-coordinate> [, <Point color> [, <Opacity>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
<X-coordinate>: Integer Horizontal position (in pixels) of the point to draw. <Y-coordinate>: Integer Vertical position (in pixels) of the point to draw. <Point color>: Integer or constant (optional) Color that must be assigned to the point. This color can correspond to:If this parameter is not specified, the color of the point: - is Transparent if dPen has not been used beforehand,
- corresponds to the color specified in the last call to dPen.
<Opacity>: Optional integer Opacity of color, included between 0 (transparent) and 255 (opaque). An opacity sets to 128 indicates that the relevant pixel will have a transparency of 50% when it is drawn on the screen or saved in an image in PNG format. Remark: This opacity will be taken into account if the drawing found in the image was initialized by the dWithOpacity constant ( dStartDrawing). Remarks Coordinates Coordinates are specified with respect to the upper-left corner of the image (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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