archive-gh-me/node-opencv
1
0
Fork 0
mirror of https://github.com/peterbraden/node-opencv.git synced 2025-12-08 19:45:55 +00:00
Code Issues Projects Releases Wiki Activity

fixed the rotate() func for angles which are multiple of 90

Browse Source
This commit is contained in:
Paul 2013-08-22 16:55:32 +04:00
parent 3105e14f25
commit b2ed603a2a
1 changed files with 31 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/Matrix.cc
View File

@ -1030,11 +1030,39 @@ Matrix::Rotate(const v8::Arguments& args){
cv::Mat res;
float angle = args[0]->ToNumber()->Value();
// Modification by SergeMv
//-------------
// If you provide only the angle argument and the angle is multiple of 90, then
// we do a fast thing
bool rightOrStraight = (ceil(angle) == angle) && (!((int)angle % 90))
&& args[1]->IsUndefined();
if (rightOrStraight) {
int angle2 = ((int)angle) % 360;
if (!angle2) { return scope.Close(Undefined()); }
if (angle2 < 0) { angle2 += 360; }
// See if we do right angle rotation, we transpose the matrix:
if (angle2 % 180) {
cv::transpose(self->mat, res);
~self->mat;
self->mat = res;
}
// Now flip the image
int mode = -1; // flip around both axes
// If counterclockwise, flip around the x-axis
if (angle2 == 90) { mode = 0; }
// If clockwise, flip around the y-axis
if (angle2 == 270) { mode = 1; }
cv::flip(self->mat, self->mat, mode);
return scope.Close(Undefined());
}
//-------------
int x = args[1]->IsUndefined() ? round(self->mat.size().width / 2) : args[1]->Uint32Value();
int y = args[1]->IsUndefined() ? round(self->mat.size().height / 2) : args[2]->Uint32Value();
cv::Point center = cv::Point(x,y);
rotMatrix = getRotationMatrix2D(center, angle, 1.0);
cv::warpAffine(self->mat, res, rotMatrix, self->mat.size());
@ -1206,4 +1234,4 @@ Matrix::CopyTo(const v8::Arguments& args){
self->mat.copyTo(dstROI);
return scope.Close(Undefined());
}
}