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x - y-coordinate of pixel y - y-coordinate of pixel buffer (optional) - name of buffer to read colour value from, e.g. dxBackBuffer() |
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Reads a dxColor value from either the current buffer or the specified buffer, and returns it. The returned colour value is in the form of an integer than contains the alpha, red, green and blue values of the pixel. IMPORTANT: You *must* use this command on a locked buffer, otherwise the command will fail. See dxLockBuffer. Also, you must make sure that the coordinates that you are reading from are valid, otherwise you will end up reading garbage values. WARNING: By not following the above advice, you may cause your computer to crash. See also: dxGetColor, dxReadPixel. |
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; dxReadPixelFast/WritePixeFast Example ; ----------------------------------- Graphics 640,480,16 dxPrint "Press a key to read dxColor values" 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()) ; Lock buffer before using dxReadPixelFast dxLockBuffer ; Use dxReadPixel to get all the dxColor information of the screen For y=0 To dxGraphicsHeight() For x=0 To dxGraphicsWidth() pix(x,y)=dxReadPixelFast(x,y) Next Next ; Lock buffer after using dxReadPixelFast dxUnLockBuffer dxCls dxLocate 0,0 dxPrint "Press a key to dxWrite pixels" dxPrint "Once this has finished, you can then press a key to end the program" dxWaitKey() ; Lock buffer before using dxWritePixelFast dxLockBuffer ; Use dxWritePixel to redraw the screen using the dxColor information we got earlier For y=0 To dxGraphicsHeight() For x=0 To dxGraphicsWidth() dxWritePixelFast x,y,pix(x,dxGraphicsHeight()-y) ; get y array value in backwards order, to dxFlip screen Next Next ; Unlock buffer after using dxWritePixelFast dxUnLockBuffer dxWaitKey() |