Mostly complete from the Python original

src/canvas.h

@@ -0,0 +1,52 @@
+#ifndef CANVAS_H
+#define CANVAS_H
+
+#include <QWidget>
+#include <QtOpenGL/QGLWidget>
+#include <QtOpenGL/QGLShaderProgram>
+#include <QMatrix4x4>
+
+class GLMesh;
+class Mesh;
+
+class Canvas : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+    Canvas(const QGLFormat& format, QWidget* parent=0);
+
+    void initializeGL();
+    void paintGL();
+    ~Canvas();
+
+public slots:
+    void load_mesh(Mesh* m);
+
+
+protected:
+    void mousePressEvent(QMouseEvent* event);
+    void mouseReleaseEvent(QMouseEvent* event);
+    void mouseMoveEvent(QMouseEvent* event);
+
+
+private:
+    void draw_mesh();
+
+    QMatrix4x4 transform_matrix() const;
+    QMatrix4x4 view_matrix() const;
+
+    QGLShaderProgram mesh_shader;
+    QGLShaderProgram quad_shader;
+
+    GLMesh* mesh;
+
+    QVector3D center;
+    float scale;
+    float tilt;
+    float yaw;
+
+    QPoint mouse_pos;
+};
+
+#endif // CANVAS_H