11 Canvas::Canvas(const QGLFormat& format, QWidget *parent)
12 : QGLWidget(format, parent), mesh(NULL),
13 scale(1), tilt(90), yaw(0), status(" ")
23 void Canvas::load_mesh(Mesh* m)
26 center = QVector3D(m->xmin() + m->xmax(),
27 m->ymin() + m->ymax(),
28 m->zmin() + m->zmax()) / 2;
30 pow(m->xmax() - m->xmin(), 2) +
31 pow(m->ymax() - m->ymin(), 2) +
32 pow(m->zmax() - m->zmin(), 2));
38 void Canvas::set_status(const QString &s)
44 void Canvas::clear_status()
50 void Canvas::initializeGL()
52 mesh_shader.addShaderFromSourceFile(QGLShader::Vertex, ":/gl/mesh.vert");
53 mesh_shader.addShaderFromSourceFile(QGLShader::Fragment, ":/gl/mesh.frag");
56 backdrop = new Backdrop();
59 void Canvas::paintEvent(QPaintEvent *event)
63 glClearColor(0.0, 0.0, 0.0, 0.0);
64 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
65 glEnable(GL_DEPTH_TEST);
68 if (mesh) draw_mesh();
70 if (status.isNull()) return;
72 QPainter painter(this);
73 painter.setRenderHint(QPainter::Antialiasing);
74 painter.drawText(10, height() - 10, status);
78 void Canvas::draw_mesh()
82 // Load the transform and view matrices into the shader
84 mesh_shader.uniformLocation("transform_matrix"),
85 1, GL_FALSE, transform_matrix().data());
87 mesh_shader.uniformLocation("view_matrix"),
88 1, GL_FALSE, view_matrix().data());
90 // Find and enable the attribute location for vertex position
91 const GLuint vp = mesh_shader.attributeLocation("vertex_position");
92 glEnableVertexAttribArray(vp);
94 // Then draw the mesh with that vertex position
97 // Clean up state machine
98 glDisableVertexAttribArray(vp);
99 mesh_shader.release();
102 QMatrix4x4 Canvas::transform_matrix() const
105 m.rotate(tilt, QVector3D(1, 0, 0));
106 m.rotate(yaw, QVector3D(0, 0, 1));
108 m.translate(-center);
112 QMatrix4x4 Canvas::view_matrix() const
115 if (width() > height())
117 m.scale(-height() / float(width()), 1, 0.5);
121 m.scale(-1, width() / float(height()), 0.5);
126 void Canvas::mousePressEvent(QMouseEvent* event)
128 if (event->button() == Qt::LeftButton)
130 mouse_pos = event->pos();
131 setCursor(Qt::ClosedHandCursor);
135 void Canvas::mouseReleaseEvent(QMouseEvent* event)
137 if (event->button() == Qt::LeftButton)
143 void Canvas::mouseMoveEvent(QMouseEvent* event)
145 if (event->buttons() & Qt::LeftButton)
147 auto p = event->pos();
148 auto d = p - mouse_pos;
149 yaw = fmod(yaw - d.x(), 360);
150 tilt = fmax(0, fmin(180, tilt - d.y()));