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- Coordinates
- Using the drawing functions
- Drawing in an image with opacity
dPixelOpacity (Function) In french: dPixelOpacité Identifies the opacity of a pixel in an image that has an Alpha channel. This image can be: - an Image control,
- in a variable of type Image.
- in a variable of type WDPic (on the background layer),
- in a variable of type picLayer.
// Identify the opacity of the pixel (15, 25) // on the "IMG_ImageDrawing" control ResOpacity = dPixelOpacity(IMG_ImageDrawing, 15, 25)
Syntax
<Result> = dPixelOpacity([<Image>, ] <X-coordinate> , <Y-coordinate>)
<Result>: Integer Opacity of specified pixel (included between 0 for transparent and 255 for opaque). <Image>: Optional control name or optional Image, WDPic or picLayer variable Image to use. The image can correspond to: - the name of an Image control.
- the name of a variable of type Image.
- the name of a variable of type WDPic. Only the background layer will be handled.
- the name of a variable of type picLayer.
If this parameter is not specified, the image handled by dStartDrawing will be used. <X-coordinate>: Integer Horizontal position of pixel to use. <Y-coordinate>: Integer Vertical position of pixel to use. Remarks Coordinates Coordinates are given in pixels with respect to the upper-left corner of the image (coordinates: (0.0)). To retrieve the position of a mouse click in an Image control, use MouseXPos and MouseYPos. Drawing in an image with opacity To specify that the drawing in the image supports opacity (Alpha channel), use dStartDrawing and the dWithOpacity constant.
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