/**
* Sets the color of a pixel.
*
* @param i the pixel index
* @param color the new color for the pixel
*/
public void setColorAt(int i, Color color) {
if (image == null || i < 0 || i >= pixels()) {
throw new IndexOutOfBoundsException("" + i);
} else {
setColorAt(i % image.getWidth(), i / image.getWidth(), color);
}
}
public static void main(String[] args) {
Picture pic = new Picture();
pic.load("queen-mary.png");
for (int x = 0; x < pic.getWidth(); x++) {
for (int y = 0; y < pic.getHeight(); y++) {
Color original = pic.getColorAt(x, y);
Color negative =
new Color(255 - original.getRed(), 255 - original.getGreen(), 255 - original.getBlue());
pic.setColorAt(x, y, negative);
}
}
}
