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x - x coordinate of pixel y - y coordinate of pixel buffer (optional) - name of buffer to read colour value from, e.g. dxBackBuffer() (defaults to current graphics buffer) |
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Reads a dxColor value from either the current buffer or the specified buffer. The returned colour value is in the form of an integer that contains the alpha, red, green and blue values of the pixel. You can use this command on a locked buffer for a slight speed-up. See dxLockBuffer. Warning: this is a low level command with no error checking for out of range parameters, use with care. See also: dxGetColor, dxReadPixelFast. |
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; dxReadPixel/dxWritePixel Example ; ---------------------------- Graphics 640,480,16 dxPrint "Press a key to read dxColor values (this may take a few seconds)" dxWaitKey() ; Load and draw an image on to the screen - can be anything pic=LoadImage("media/blitz_pic.bmp") DrawImage pic,0,0 ; Initialise an array big enough to fit all the dxColor information of the screen Dim pix(dxGraphicsWidth(),dxGraphicsHeight()) ; Use dxReadPixel to get all the dxColor information of the screen For y=0 To dxGraphicsHeight() For x=0 To dxGraphicsWidth() pix(x,y)=dxReadPixel(x,y) Next Next dxCls dxLocate 0,0 dxPrint "Press a key to dxWrite pixels (this may takes a few seconds)" dxPrint "Once this has finished, you can then press a key to end the program" dxWaitKey() ; Use dxWritePixel to redraw the screen using the dxColor information we got earlier For y=0 To dxGraphicsHeight() For x=0 To dxGraphicsWidth() dxWritePixel x,y,pix(x,dxGraphicsHeight()-y) ; get y array value in backwards order, to dxFlip screen Next Next dxWaitKey() |