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[java] drawing single pixels

General and Gameplay Programming Programming

Started by walkingcarcass April 13, 2004 10:07 AM

5 comments, last by walkingcarcass 20 years ago

walkingcarcass

116

Author

April 13, 2004 10:07 AM

I''m using Java 2 1.4.2, my assignment involves calculating the colour of a pixel for a given (x,y) and drawing it. I''m given an off-screen Graphics interface, but I;ve checked the docs and other than drawing a line or rectangle of size 1, I can''t seem to find a way to say, basically: plotPixel(colour,x,y) am I being stupid

spraff.net: don't laugh, I'm still just starting...

garazdawi

145

April 13, 2004 11:32 AM

You might want to check the java source code to see how they do it. Look under java.awt.Graphics.drawLine() and you might find what you want.... or not...

[edited by - garazdawi on April 13, 2004 12:44:09 PM]

garazdawi - 'I put the laughter back in slaughter'

Anonymous

April 13, 2004 12:04 PM

Use a BufferedImage, and manipulate the buffer directly.

Anonymous

April 13, 2004 12:53 PM

fillRect(x,y,1,1) will get the job done.

Koroljov

115

April 13, 2004 01:39 PM

Anonymous Poster (1) is right. Use a BufferedImage, or a MemoryImageSource. You won''t find the source of java.awt.Graphics.drawLine(), and fillRect is too slow. Way too slow.

Why do my programs never work on other computers?

Anonymous

April 14, 2004 01:43 AM

// create graphics context and imageGraphics graphics = getGraphics();BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);DataBufferInt data = (DataBufferInt)(image.getRaster().getDataBuffer());// get the framebufferint pixel[] = data.getData();// access individual pixels like thispixel[x+w*y] = 0xffffffff;// paint framebuffer on screengraphics.drawImage(image,0,0,w,h,null);