How to convert ofVec2f in glm::vec2?

beginners
#1

Hi, I’ve tried to replace ofVec2f with glm::vec2 but I can’t get the rotation method. Does anyone know how to solve it?

glm::vec<2, float> mousePos(ofGetMouseX(), ofGetMouseY());
    
    int numTriangoles = 10;
       int minOffset = 5;
       int maxOffest = 70;
       int alpha = 20;
    
    if (ofGetMousePressed(OF_MOUSE_BUTTON_LEFT)) {
    //ON MOUSE PRESSED
         /* ____________________________________________________________________ */
         for(int triangleInstance=0; triangleInstance<numTriangoles; triangleInstance++){
             float offsetDistance = ofRandom(minOffset, maxOffest);
             float transparency = 40;
             float brushWidth = 0.45;
// tried to use glm::vec2 and vector<glm::vec2>(don't remember exactly), but it didn't work
            ofVec2f p1(0., 25.*brushWidth);
             ofVec2f p2(100*brushWidth, 0);
             ofVec2f p3(0, -25.0*brushWidth);
         
             float rotation = ofRandom(360.0);
             p1.rotate(rotation);
             p2.rotate(rotation);
             p3.rotate(rotation);
             
             ofVec2f triangleoffset(offsetDistance);
             p1 += mousePos;
             p2 += mousePos;
             p3 += mousePos;
#2

You can probably convert from ofVec2f to glm::vec2 like this:

glm::vec2 new_p1 = glm::vec2(p1.x, p1.y);
#3

Thanks. At least I have no error on that part.

glm::vec2 p1 = glm::vec2(p1.x, p1.y);
             p1.x = 0.;
             p1.y = 25.*brushWidth;
             glm::vec2 p2 = glm::vec2(p1.x, p1.y);
             p2.x = 100*brushWidth;
             p2.y = 0.;
             glm::vec2 p3 = glm::vec2(p1.x, p1.y);
             p3.x = 0.;
             p3.y = -25.*brushWidth;
             
//             ofVec2f p1(0., 25.*brushWidth);
//             ofVec2f p2(100*brushWidth, 0);
//             ofVec2f p3(0, -25.0*brushWidth);

// on the following block I still have this error though `No member named 'rotate' in 'glm::vec<2, float, glm::packed_highp>' `
             float rotation = ofRandom(360.0);
             p1.rotate(rotation);
             p2.rotate(rotation);
             p3.rotate(rotation);

Any thought about that? :slight_smile:

#4

rotate() is a property/class method of ofVec2f . glm::vec2 has no such functionality, see here. Either convert your vectors after the rotation or use something like glm::rotate() , which takes a glm::vec2 and an angle in radians, see here.

1 Like
#5


https://glm.g-truc.net/0.9.8/index.html