Turn single pixel on/off or change color in Java

How should I开发者_如何转开发 turn a each pixel on or off and change its color :-/

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if you use BufferedImage, there's a method called setRGB which should do what you want.

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If you're doing normal painting with a Graphics (or Graphics2D) object (a.k.a using AWT/Swing), then drawing a single-pixel line is the normal way:

int x = 100;
int y = 200;
g.drawLine(x, y, x, y);

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There are no methods for drawing pixels, to my knowledge, in java. What you do, is do use fillRect or drawLine (on a BufferedImage), with with and height equal to 1. Use setRGB beforehand to set the color.

However, if you are using this to create a single image, (like a fractal picture generator or similar), then there are much more efficient methods:

int pixels[] = new int[width * height];

//Draw pixels here, by using something like this:
pixels[y*width + x] = (alpha<<24) | (rgb[0]<<16) | (rgb[1]<<8) | rgb[2]

//Convert to an image like so:
MemoryImageSource source = new MemoryImageSource(width,height,pixels,0,width);
Image image = Toolkit.getDefaultToolkit().createImage(source);