private void transposePicture() {
final Picture transposedPicture = new Picture(picture.height(), picture.width());
final int width = transposedPicture.width();
final int height = transposedPicture.height();
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
transposedPicture.set(i, j, picture.get(j, i));
}
}
picture = transposedPicture;
}
// energy of pixel at column x and row y
public double energy(final int x, final int y) {
checkBounds(x, y);
if (onTheEdge(x, y)) {
return EDGE_ENERGY;
}
final Color leftPixel = picture.get(x - 1, y);
final Color rightPixel = picture.get(x + 1, y);
final double RX = leftPixel.getRed() - rightPixel.getRed();
final double GX = leftPixel.getGreen() - rightPixel.getGreen();
final double BX = leftPixel.getBlue() - rightPixel.getBlue();
final Color topPixel = picture.get(x, y - 1);
final Color bottomPixel = picture.get(x, y + 1);
final double RY = topPixel.getRed() - bottomPixel.getRed();
final double GY = topPixel.getGreen() - bottomPixel.getGreen();
final double BY = topPixel.getBlue() - bottomPixel.getBlue();
final double deltaXSquared = (RX * RX) + (GX * GX) + (BX * BX);
final double deltaYSquared = (RY * RY) + (GY * GY) + (BY * BY);
return Math.sqrt(deltaXSquared + deltaYSquared);
}
// remove vertical seam from current picture
public void removeVerticalSeam(final int[] seam) {
checkSeam(seam, height(), width());
final int width = width() - 1;
final int height = height();
final Picture newPicture = new Picture(width, height);
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
int index;
if (i < seam[j]) {
index = i;
} else {
index = i + 1;
}
final Color color = picture.get(index, j);
newPicture.set(i, j, color);
}
}
picture = newPicture;
}
