/*
* draws a robot with a given size, using the various parameters
*(orientation,
* position, ..) from the robot struct
*/
void draw_robot(cairo_t* cr, struct robot* myRobot, double size)
{
double x1 = -70, y1 = -30,
y2 = 10,
x4 = 70,
x5 = 0, y5 = -100;
double px2 = -70, py2 = 100,
px3 = 70, py3 = 100,
px4 = 70, py4 = 10;
cairo_save(cr);
cairo_translate(cr, myRobot->x, myRobot->y);
cairo_scale(cr, size, size);
cairo_save(cr);
cairo_rotate(cr, degtorad(90 + myRobot->degree));
cairo_set_source_rgba(cr, myRobot->color[0], myRobot->color[1],
myRobot->color[2], 0.6);
cairo_set_line_width(cr, 2);
cairo_move_to(cr, x1, y1);
cairo_line_to(cr, x1, y2);
cairo_curve_to(cr, px2, py2, px3, py3, px4, py4);
cairo_line_to(cr, x4, y1);
cairo_line_to(cr, x5, y5);
cairo_close_path(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_move_to(cr, 30, 0);
cairo_arc_negative(cr, 0, 0, 30, 0, -2 * M_PI);
cairo_fill_preserve(cr);
cairo_set_source_rgba(cr, 0.1, 0.7, 0.5, 0.5);
cairo_stroke(cr);
cairo_restore(cr); /* pop rotate */
draw_cannon(cr, degtorad(270 + myRobot->cannon_degree));
draw_radar(cr, degtorad(270 + myRobot->radar_degree));
cairo_restore(cr); /* pop translate/scale */
shot_animation(cr, size, degtorad(myRobot->cannon_degree),
&myRobot->cannon[0]);
shot_animation(cr, size, degtorad(myRobot->cannon_degree),
&myRobot->cannon[1]);
}
void display(void)
{
static float angle = 0.0 ;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glLoadIdentity();
gluLookAt (camera[0], camera[1], camera[2],
(GLdouble) ball_position.x, 0.0,
(GLdouble) ball_position.y,
0.0, 0.0, 1.0);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glColorMask(1,1,1,1);
glEnable(GL_LIGHTING);
glEnable(GL_BLEND);
draw_dirt();
glPushMatrix();
glTranslatef ( 2.0 , 0.0 , 0 );
draw_cannon();
glPopMatrix();
glPushMatrix();
glTranslatef ( ball_position.x , 0.0 , ball_position.y );
if ( ball_position.y > 1.0 ) {
angle++;
glRotatef (angle, 0.0f, 0.0f, 1.0f);
}
draw_ball() ;
glPopMatrix();
glutSwapBuffers();
}
