private void singleGradient(int[] pixels, int w, int h, float rowrel, float dx, float dy) {
int off = 0;
for (int y = 0; y < h; y++) {
float colrel = rowrel;
int j = w;
int rgb;
if (colrel <= 0.0) {
rgb = colormap.getColor(0);
do {
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
colrel += dx;
} while (--j > 0 && colrel <= 0.0);
}
while (colrel < 1.0 && --j >= 0) {
if (type == BILINEAR) rgb = colormap.getColor(map(ImageMath.triangle(colrel)));
else rgb = colormap.getColor(map(colrel));
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
colrel += dx;
}
if (j > 0) {
if (type == BILINEAR) rgb = colormap.getColor(0.0f);
else rgb = colormap.getColor(1.0f);
do {
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
} while (--j > 0);
}
rowrel += dy;
}
}
private void conicalGradient(int[] pixels, int y, int w, int h) {
int off = 0;
float angle0 = (float) Math.atan2(p2.x - p1.x, p2.y - p1.y);
for (int x = 0; x < w; x++) {
float angle = (float) (Math.atan2(x - p1.x, y - p1.y) - angle0) / (ImageMath.TWO_PI);
angle += 1.0f;
angle %= 1.0f;
if (type == BICONICAL) angle = ImageMath.triangle(angle);
int rgb = colormap.getColor(map(angle));
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
}
}
private void squareGradient(int[] pixels, int y, int w, int h) {
int off = 0;
float radius = Math.max(Math.abs(p2.x - p1.x), Math.abs(p2.y - p1.y));
for (int x = 0; x < w; x++) {
float distance = Math.max(Math.abs(x - p1.x), Math.abs(y - p1.y));
float ratio = distance / radius;
if (repeat) ratio = ratio % 2;
else if (ratio > 1.0) ratio = 1.0f;
int rgb = colormap.getColor(map(ratio));
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
}
}
private void repeatGradient(int[] pixels, int w, int h, float rowrel, float dx, float dy) {
int off = 0;
for (int y = 0; y < h; y++) {
float colrel = rowrel;
int j = w;
int rgb;
while (--j >= 0) {
if (type == BILINEAR) rgb = colormap.getColor(map(ImageMath.triangle(colrel)));
else rgb = colormap.getColor(map(ImageMath.mod(colrel, 1.0f)));
pixels[off] = PixelUtils.combinePixels(rgb, pixels[off], paintMode);
off++;
colrel += dx;
}
rowrel += dy;
}
}