karma/flying-balls
1
1
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

working gtk-3.0 version

Browse Source 
- removed expose event
 - added repositioning after reconfigure event
 - disabled all tangential-friction mechanics
This commit is contained in:
Antonio Carzaniga 2021-06-07 12:03:55 +02:00
parent 3309523725
commit d033118653
1 changed files with 37 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
balls.c
View File

@ -149,19 +149,24 @@ static void tangential_friction2(double u, double p, double r, double * v, doubl
*v = (sr + a*u + a*p*r)/3;
*q = (sr - 2*a*u - 2*a*p*r)/(3*r);
}
#endif
static void tangential_friction3(double u, double p, double r, double * v, double * q) {
static const double a = 0.5;
double w = u - p*r;
*v = u - a*w;
#if 0
*q = sqrt(p*p*r*r - 2*a*a*w + 4*u*a*w)/r;
if (w > 0)
*q = -*q;
#else
*q = (*v)/r;
#endif
static void tangential_friction3(double u, double p, double r, double * v_ptr, double * q_ptr) {
static const double a = 0.9;
double v, q;
v = (1-a)*u + a*p*r;
/* 2 2 2 2 2 2
* sqrt((4 a - 2 a ) u + (4 a - 4 a) p r u + (1 - 2 a ) p r )
* q = -------------------------------------------------------------
* r
*/
q = sqrt(2*a*(2 - a)*u*u + 4*a*(a - 1)*p*r*u + (1 - 2*a*a)*p*p*r*r)/r;
if (p*r > v)
q = -q;
*v_ptr = v;
*q_ptr = q;
}
#endif
void ball_update_state (struct ball * p) {
p->x += delta*p->v_x + delta*delta*g_x/2.0;
@ -174,18 +179,17 @@ void ball_update_state (struct ball * p) {
if (p->v_x > 0) {
p->x -= p->x + p->radius - width;
p->v_x = -p->v_x;
/* tangential friction */
#if 0
/* tangential friction */
tangential_friction(p->v_y, -p->v_angle, p->radius, &(p->v_y), &(p->v_angle));
p->v_angle = -p->v_angle;
#endif
}
} else if (p->x < p->radius) { /* left wall */
if (p->v_x < 0) {
p->x += p->radius - p->x;
p->v_x = -p->v_x;
/* tangential friction */
#if 0
/* tangential friction */
tangential_friction(p->v_y, p->v_angle, p->radius, &(p->v_y), &(p->v_angle));
#endif
}
@ -195,8 +199,8 @@ void ball_update_state (struct ball * p) {
if (p->v_y > 0) {
p->y -= p->y + p->radius - height;
p->v_y = -p->v_y;
#if 0
/* tangential friction */
#if 1
tangential_friction3(p->v_x, p->v_angle, p->radius, &(p->v_x), &(p->v_angle));
#endif
}
@ -204,8 +208,8 @@ void ball_update_state (struct ball * p) {
if (p->v_y < 0) {
p->y += p->radius - p->y;
p->v_y = -p->v_y;
/* tangential friction */
#if 0
/* tangential friction */
tangential_friction(p->v_x, -p->v_angle, p->radius, &(p->v_x), &(p->v_angle));
p->v_angle = -p->v_angle;
#endif
@ -218,6 +222,20 @@ void ball_update_state (struct ball * p) {
p->angle += 2*M_PI;
}
void reposition_within_borders () {
for(int i = 0; i < n_balls; ++i) {
struct ball * p = balls + i;
if (p->x < p->radius)
p->x = p->radius;
else if (p->x + p->radius > width)
p->x = width - p->radius;
if (p->y < p->radius)
p->y = p->radius;
else if (p->y + p->radius > height)
p->y = height - p->radius;
}
}
void movement_and_borders () {
for(int i = 0; i < n_balls; ++i)
ball_update_state(balls + i);
@ -578,6 +596,7 @@ gint configure_event (GtkWidget *widget, GdkEventConfigure * event) {
width = gtk_widget_get_allocated_width(widget);
height = gtk_widget_get_allocated_height(widget);
reposition_within_borders();
return TRUE;
}
@ -743,7 +762,7 @@ int main (int argc, const char *argv[]) {
gtk_widget_set_events (window, GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK | GDK_KEY_PRESS_MASK);
canvas = gtk_drawing_area_new ();
g_signal_connect (G_OBJECT (canvas), "expose-event", G_CALLBACK (expose_event), NULL);
g_signal_connect (G_OBJECT (canvas), "configure-event", G_CALLBACK(configure_event), NULL);
gtk_container_add (GTK_CONTAINER (window), canvas);