Hi everyone,

I'm drawing a large amount of triangles on the screen using the intialize-resize-paint method.
The program works, but without animation.
I've been trying for a long time to figure out how to use a Timer to animate this, but I haven't been able to find a way.
(Background info: the animation I want is to make the triangles rotate and scale individually.)
Can somebody help me?

Since it is quite a large program, I have brought the code down to structure only.

Thank you ahead of time!

In the main:
Qt Code: 
  1. int main(int argc, char **argv)
  2. {
  3.     QApplication a(argc,argv);
  4.  
  5.     GlWidget w;
  6.     w.show();
  7.  
  8.     return a.exec();
  9. }
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In the glwidget header file:

Qt Code: 
  1. class GlWidget : public QGLWidget
  2. {
  3.     Q_OBJECT    //this macro is included because we might want to use signals and slots
  4.  
  5. public:
  6.     GlWidget(QWidget *parent = 0);
  7.     ~GlWidget();
  8.     QSize sizeHint() const; //to set reasonable default sizes
  9.  
  10. protected:
  11.  
  12.     void initializeGL();
  13.     void resizeGL(int width, int height);
  14.     void paintGL();
  15.  
  16. private:
  17.  
  18.     makeTriangles();
  19.     QVector<QVector3D> vertices, colors;
  20.  
  21. };
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In the glwidget source file:

Qt Code: 
  1. #include "glwidget.h"
  2.  
  3. //! [0]
  4. GlWidget::GlWidget(QWidget *parent) : QGLWidget(QGLFormat(), parent)
  5. {
  6. }
  7.  
  8. GlWidget::~GlWidget()
  9. {
  10. }
  11.  
  12.  
  13. QSize GlWidget::sizeHint() const
  14. {
  15.     return QSize(520, 640);
  16. }
  17. //! [0]
  18.  
  19.  
  20. //! [1]
  21.  
  22. void GlWidget::initializeGL()
  23. {
  24.     glEnable(GL_DEPTH_TEST);
  25.  
  26.     glEnable(GL_CULL_FACE);
  27.  
  28.     QGLWidget::qglClearColor(QColor(20,20,20,255));
  29.  
  30.     shaderProgram.addShaderFromSourceFile(QGLShader::Vertex, ":/vertexShader.vsh");
  31.     shaderProgram.addShaderFromSourceFile(QGLShader::Fragment, ":/fragmentShader.fsh");
  32.     shaderProgram.link();
  33.  
  34.     makeTriangles();
  35. }
  36. //! [1]
  37.  
  38. //! [2]
  39.  
  40. void GlWidget::resizeGL(int width, int height)
  41. {
  42.     if (height == 0) {
  43.         height = 1;
  44.     }
  45.  
  46.     pMatrix.setToIdentity();
  47.     pMatrix.perspective(60.0, (float) width / (float) height, 0.001, 1000);
  48.  
  49.     glViewport(0, 0, width, height);
  50. }
  51. //! [2]
  52.  
  53. //! [3]
  54. void GlWidget::paintGL()
  55. {
  56.  
  57.     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  58.  
  59.     QMatrix4x4 mMatrix;
  60.     QMatrix4x4 vMatrix;
  61.  
  62.     shaderProgram.bind();
  63.  
  64.     shaderProgram.setUniformValue("mvpMatrix", pMatrix * vMatrix * mMatrix); 
  65.  
  66.     shaderProgram.setAttributeArray("color", colors.constData());
  67.     shaderProgram.enableAttributeArray("color");
  68.  
  69.     shaderProgram.setAttributeArray("vertex", vertices.constData());
  70.     shaderProgram.enableAttributeArray("vertex");
  71.  
  72.     glDrawArrays(GL_TRIANGLES, 0, vertices.size());
  73.  
  74.     shaderProgram.disableAttributeArray("vertex");
  75.     shaderProgram.disableAttributeArray("color");
  76.     shaderProgram.release(); 
  77. }
  78.  
  79.  
  80. GlWidget::makeTriangles()
  81. {
  82.     /*specify vertices and colors of triangles, here, the variables vertices and color are defined*/
  83. }
  84. //! [3]
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