/*
* rotate image using one of three sampling techniques
*/
Image* ip_rotate (Image* src, double theta, int x, int y, int samplingMode,
int gaussianFilterSize, double gaussianSigma)
{
Image* tempImage = new Image(src->getWidth(), src->getHeight());
if(samplingMode == 0){
for (int i = 0; i < src->getWidth(); ++i) {
for (int j = 0; j < src->getHeight(); ++j) {
Pixel resampledPixel = ip_resample_nearest(src, i, j);
tempImage->setPixel_((((i-x)*(cos(theta))-((j-y)*sin(theta)))), (((j-y)*(cos(theta))+ ((i-x)*(sin(theta))))), resampledPixel);
}
}
}
else if(samplingMode == 1){
for (int i = 0; i < src->getWidth(); ++i) {
for (int j = 0; j < src->getHeight(); ++j) {
Pixel resampledPixel = ip_resample_bilinear(src, i, j);
tempImage->setPixel_((((i-x)*(cos(theta))-((j-y)*sin(theta)))), (((j-y)*(cos(theta))+ ((i-x)*(sin(theta))))), resampledPixel);
}
}
}
else if (samplingMode == 2){
//go die
}
return tempImage;
}
/*
* scale image
*/
Image* ip_scale (Image* src, double xFac, double yFac)
{
Image* dest = new Image(src->getWidth()*xFac, src->getHeight()*yFac);
for (int i = 0; i < dest->getWidth(); ++i) {
for (int j = 0; j < dest->getHeight(); ++j) {
double xp = i*1./xFac;
double yp = j*1./yFac;
if (xp >= src->getWidth() || xp < 0 || yp >= src->getHeight() || yp < 0) {
continue;
}
Pixel p = ip_resample_bilinear(src, xp, yp);
dest->setPixel(i, j, p);
}
}
return dest;
}
/*
* rotate image
*/
Image* ip_rotate (Image* src, double theta)
{
Image* dest = new Image(src->getWidth(), src->getHeight());
double x = src->getWidth()/2;
double y = src->getHeight()/2;
double ctheta = cos(-theta);
double stheta = sin(-theta);
Pixel white = Pixel(1, 1, 1);
dest->fillImage(white);
for (int i = 0; i < dest->getWidth(); ++i) {
for (int j = 0; j < dest->getHeight(); ++j) {
double xp = x + (i-x)*ctheta - (j-y)*stheta;
double yp = y + (i-x)*stheta + (j-y)*ctheta;
Pixel p = ip_resample_bilinear(src, xp, yp);
dest->setPixel(i, j, p);
}
}
return dest;
}
