void MyPanelOpenGL::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslated(5.0, 5.0, 0.0); // The middle of the screen is located at (5, 5, 0), thus I translate.
switch (myMode)
{
case rectangle:
{
glColor3f(1.0f, 1.0f, 0.0f);
draw_rect2d(rect_width, rect_height);
break;
}
case circle:
{
glColor3f(0.0f, 1.0f, 0.0f);
draw_circle2d(circle_radius, circle_verticies);
break;
}
case triangle:
{
draw_triangle2d(triangle_point1, triangle_point2, triangle_point3);
break;
}
case custom:
{
draw_custom();
break;
}
}
glFlush();
}
void GLWidget::paintGL() {
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glScalef(2, 2, 0);
glTranslatef(-0.5, -0.5, 0);
//grid
glColor3f(0,0,0);
glLineWidth(1);
draw_grid2d(Vec2f(0,0), sim.dx, sim.n, sim.n);
//particles
glColor3f(0,0,1);
for(int i=0; i < sim.particles.size(); i++){
draw_circle2d(sim.particles[i], sim.particle_radius, 20);
}
//velocity
glColor3f(1,0,0);
for(int j = 0;j < sim.n; ++j) for(int i = 0; i < sim.n; ++i) {
Vec2f pos((i+0.5)*sim.dx,(j+0.5)*sim.dx);
draw_arrow2d(pos, pos + 0.01f*sim.get_velocity(pos), 0.01*sim.dx);
}
}
/**
* This is my custom function in which I will draw something fun.
*/
void MyPanelOpenGL::draw_custom()
{
// First draw the picture frame
glLineWidth(3.0f);
glColor3f(0.6f, 0.0f, 0.2f);
glBegin(GL_LINE_LOOP);
glVertex2f(-2.0f, -2.0f);
glVertex2f(2.0f, -2.0f);
glVertex2f(2.0f, 2.0f);
glVertex2f(-2.0f, 2.0f);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex2f(-1.8f, -1.8f);
glVertex2f(1.8f, -1.8f);
glVertex2f(1.8f, 1.8f);
glVertex2f(-1.8f, 1.8f);
glEnd();
// Draw insides - star (circle)
// Inside: Draw Lines
int i;
float angle;
glBegin(GL_LINES);
for (i = 0; i < 8; i++)
{
angle = 3.14159 * 2 * i / 8; // 2PI * i/v
glColor3f(angle, angle, angle);
glVertex2f(1.0f * sin(angle), 1.0f * cos(angle));
glColor3f(angle/128, angle/128, angle/128);
glVertex2f(-1.0f * sin(angle), -1.0f * cos(angle));
}
glEnd();
// Inside: Draw Circles on each tip
for (i = 0; i < 8; i++)
{
// Every time I will reset matrix and re-translate to center so that I can properly translate to end of line.
glLoadIdentity();
glTranslatef(5.0f, 5.0f, 0.0f);
angle = 3.14159 * 2 * i / 8; // 2PI * i/v
glTranslatef(1.0f * sin(angle), 1.0f * cos(angle), 0.0f);
glColor3f(0.1f, 0.0f, 1.0f);
draw_circle2d(0.1f, 16);
}
}
