> Also, the image is flipped on >the Y axis compared to the original example. The small green square is in the >upper left corner of test.png, but it is in the lower left corner of >aggpas_ptcgraph_output.pas
It appears there is some ambiguity on whether 0,0 should be the lower left of upper left, but I figured out how to flip the image on the Y axis: agg^.attach(@graph_buffer.data, IMAGE_WIDTH, IMAGE_HEIGHT, -(IMAGE_WIDTH * RGB_WIDTH)); makes the image what I would consider upside down because agg^.rectangle(10, 10, 50, 50); ends up in the lower left corner but ptcgraph.Rectangle(10,10,100,100); ends up in the upper right corner. If I use agg^.attach(@graph_buffer.data, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_WIDTH * RGB_WIDTH); now both agg^.rectangle(10, 10, 50, 50); and ptcgraph.Rectangle(10,10,100,100); end up in the upper left corner with the 10,10 coordinates matching up I still have not figured out how to switch red and blue bits around so putimage() will work. James -----Original Message----- From: fpc-pascal [mailto:fpc-pascal-boun...@lists.freepascal.org] On Behalf Of James Richters Sent: Tuesday, June 13, 2017 12:43 PM To: 'FPC-Pascal users discussions' <fpc-pascal@lists.freepascal.org> Subject: Re: [fpc-pascal] Implementing AggPas with PtcGraph I've just realized that the red and blue channels are reversed. The sample program aggpas_ptcgraph_output.pas has the star filled in with a red fade and a blue series of random lines while the original test.png file had a blue fade in the star with red random lines. Also, the image is flipped on the Y axis compared to the original example. The small green square is in the upper left corner of test.png, but it is in the lower left corner of aggpas_ptcgraph_output.pas I've been able to duplicate the results of test.png by shifting the left 5 bits 11 positions to the right and the right 5 bits 11 positions to the left and flipping the Y axis, but I can only do that with putpixel and a nested loop, which is quite a bit slower than putimage. Any ideas how I can build the data correctly so putimage will work? James _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
