Warp Image by Diagonal Sine Wave - c++

Question

I'm trying to warp colour image using sin function in OpenCV and I was successful in doing so. However, how can I make a 'diagonal' warping using sine wave?
My code is this:
Mat result = src.clone();
for (int i = 0; i < src.rows; i++) { // to y
for (int j = 0; j < src.cols; j++) { // to x
for (int ch = 0; ch < 3; ch++) { // each colour
int offset_x = 0;
int offset_y = (int)(25.0 * sin(3.14 * j / 150));
if (i + offset_y < src.rows) {
result.at<Vec3b>(i, j)[ch] = src.at<Vec3b>((i + offset_y) % src.rows, j)[ch];
}
else
result.at<Vec3b>(i, j)[ch] = 0.0;
}
}
}
imshow("result", result);
How can I do this? Not drawing a sine graph, but warping an image.
Solved this! Several times ago, I've received a message by someone who told me that the image is stolen. It was from Google, actually, but I've deleted it to fulfill not to cause any situations. Thx!

Answer 1

I think it should look like this:
void deform()
{
float alpha = 45 * CV_PI / 180.0; // wave direction
float ox = cos(alpha);
float oy = sin(alpha);
cv::Mat src = cv::imread("F:/ImagesForTest/lena.jpg");
for (int i = 0; i < src.rows; i+=8)
{
cv::line(src, cv::Point(i, 0), cv::Point(i, src.rows),cv::Scalar(255,255,255));
}
for (int j = 0; j < src.cols; j += 8)
{
cv::line(src, cv::Point(0,j), cv::Point(src.cols,j), cv::Scalar(255, 255, 255));
}
cv::Mat result = src.clone();
for (int i = 0; i < src.rows; i++)
{ // to y
for (int j = 0; j < src.cols; j++)
{ // to x
float t =(i * oy)+ (j * ox); // wave parameter
for (int ch = 0; ch < 3; ch++)
{ // each colour
int offset_x =ox* (int)(25.0 * (sin(3.14 * t/ 150)));
int offset_y =oy* (int)(25.0 * (sin(3.14 * t / 150)));
if (i + offset_y < src.rows && j + offset_x < src.rows && i + offset_y >=0 && j + offset_x>=0)
{
result.at<cv::Vec3b>(i, j)[ch] = src.at<cv::Vec3b>(i + offset_y, j + offset_x )[ch];
}
else
result.at<cv::Vec3b>(i, j)[ch] = 0.0;
}
}
}
cv:: imshow("result", result);
cv::imwrite("result.jpg", result);
cv::waitKey();
}
The result:
BTW, may be better to use cv::remap ?