karma/flying-balls
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added spaceship, with basic direction and thrust control.

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This commit is contained in:
Antonio Carzaniga 2021-12-03 00:29:18 +01:00
parent dfd7ca908b
commit b2e760a749
1 changed files with 70 additions and 4 deletions
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74
balls.c
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@ -44,6 +44,21 @@ void random_velocity(struct ball * p) {
} while (r2 > v_max*v_max || r2 < v_min*v_min);
}
struct ball spaceship;
double spaceship_thrust = 0;
int spaceship_thrust_countdown = 0;
int spaceship_thrust_init = 50;
void spaceship_init_state () {
spaceship.x = width/2;
spaceship.y = height/2;
spaceship.radius = 15;
spaceship.v_x = 0;
spaceship.v_y = 0;
spaceship.angle = 0;
spaceship.v_angle = 0;
}
void balls_init_state () {
srand(time(NULL));
static const unsigned int border = 10;
@ -127,6 +142,23 @@ void ball_update_state (struct ball * p) {
p->angle += 2*M_PI;
}
void spaceship_update_state () {
if (spaceship_thrust > 0) {
double fx = cos(spaceship.angle)*spaceship_thrust;
double fy = sin(spaceship.angle)*spaceship_thrust;
spaceship.x += delta*delta*fx/2.0;
spaceship.v_x += delta*fx;
spaceship.y += delta*delta*fy/2.0;
spaceship.v_y += delta*fy;
if (spaceship_thrust_countdown > 0)
--spaceship_thrust_countdown;
else
spaceship_thrust = 0;
}
ball_update_state(&spaceship);
}
void reposition_within_borders () {
for(int i = 0; i < n_balls; ++i) {
struct ball * p = balls + i;
@ -144,6 +176,7 @@ void reposition_within_borders () {
void movement_and_borders () {
for(int i = 0; i < n_balls; ++i)
ball_update_state(balls + i);
spaceship_update_state();
}
/* Trivial collision check
@ -153,6 +186,8 @@ void check_collisions_simple () {
for(int i = 0; i < n_balls; ++i)
for(int j = i + 1; j < n_balls; ++j)
ball_elastic_collision(balls + i, balls + j);
for(int j = 0; j < n_balls; ++j)
ball_elastic_collision(&spaceship, balls + j);
}
void check_collisions_with_index () {
@ -308,6 +343,28 @@ void destroy_graphics() {
faces_count = 0;
}
void draw_space_ship (cairo_t * cr) {
static const double one_over_sqrt_2 = 0.70710678118654752440;
cairo_save(cr);
cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
cairo_translate(cr, spaceship.x, spaceship.y);
cairo_rotate(cr, spaceship.angle);
cairo_arc(cr, 0, 0, spaceship.radius, 0, 2*M_PI);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 1.0);
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, -one_over_sqrt_2*spaceship.radius, one_over_sqrt_2*spaceship.radius);
cairo_line_to (cr, spaceship.radius, 0);
cairo_line_to (cr, -one_over_sqrt_2*spaceship.radius, -one_over_sqrt_2*spaceship.radius);
cairo_line_to (cr, 0, 0);
cairo_stroke(cr);
for (unsigned int i = 0; i < spaceship_thrust; i += 5) {
cairo_arc(cr, 0, 0, spaceship.radius + i, 0.7*M_PI, 1.3*M_PI);
cairo_stroke(cr);
}
cairo_restore(cr);
}
void draw_balls_onto_window () {
/* clear pixmap */
GdkWindow * window = gtk_widget_get_window(canvas);
@ -322,7 +379,8 @@ void draw_balls_onto_window () {
draw_gravity_vector(cr);
/* draw balls */
for(const struct ball * b = balls; b != balls + n_balls; ++b) {
draw_space_ship(cr);
for (const struct ball * b = balls; b != balls + n_balls; ++b) {
cairo_save(cr);
cairo_translate(cr, b->x - b->radius, b->y - b->radius);
unsigned int face_id;
@ -394,9 +452,16 @@ gboolean mouse_scroll (GtkWidget *widget, GdkEvent *event, gpointer user_data) {
case GDK_SCROLL_SMOOTH: {
double dx, dy;
gdk_event_get_scroll_deltas (event, &dx, &dy);
g_x -= 10*dx;
g_y -= 10*dy;
gravity_vector_countdown = gravity_vector_init;
spaceship.angle -= dx/4;
if (spaceship.angle < 0)
spaceship.angle += 2*M_PI;
else if (spaceship.angle > 2*M_PI)
spaceship.angle -= 2*M_PI;
spaceship_thrust += dy;
if (spaceship_thrust > 0)
spaceship_thrust_countdown = spaceship_thrust_init;
else
spaceship_thrust = 0;
break;
}
case GDK_SCROLL_LEFT:
@ -543,6 +608,7 @@ int main (int argc, const char *argv[]) {
assert(c_index_init());
balls_init_state();
spaceship_init_state();
gtk_init(0, 0);