olemorud/cgraphics
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gravity constant and gravitational acceleration

Browse Source
This commit is contained in:
Ole Morud
2022-06-07 15:28:29 +02:00
parent 91a43e6983
commit 5be3a4ce48
1 changed files with 26 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
physics.c
View File

@@ -4,13 +4,16 @@
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#define GRAVITY 0.01f
#define FRAMERATE 10
typedef struct Point{ typedef struct Point{
uint x; double x;
uint y; double y;
uint px; double px;
uint py; double py;
uint fx; double fx;
uint fy; double fy;
} Point; } Point;
typedef struct Link { typedef struct Link {
@@ -22,14 +25,14 @@ typedef struct Link {
void draw_link(Canvas* c, Link* l){ void draw_link(Canvas* c, Link* l){
line(&c, l->a->x, l->a->y, l->b->x, l->b->y); line(c, l->a->x, l->a->y, l->b->x, l->b->y);
} }
void update_point(Point* p){ void update_point(Point* p){
uint tempx = p->x; uint tempx = p->x;
uint tempy = p->y; uint tempy = p->y;
p->x += (p->x - p->px) + fx; p->x += (p->x - p->px) + p->fx;
p->y += (p->y - p->py) + fy; p->y += (p->y - p->py) + p->fy;
p->px = tempx; p->px = tempx;
p->py = tempy; p->py = tempy;
} }
@@ -38,25 +41,30 @@ void update_point(Point* p){
int main(){ int main(){
char *data = malloc(40*40); char *data = malloc(40*40);
Canvas c = {40, 40, data}; Canvas c = {40, 40, data};
memset(c.data, '.', c.x * c.y);
Point a = { 10.0, 10.0,
10.0, 10.0,
0.0, GRAVITY/FRAMERATE};
Point b = { 20.0, 10.0,
20.0, 10.0,
0.0, GRAVITY/FRAMERATE};
Point a = {10, 10, 10, 10, 0, 5};
Point b = {20, 10, 10, 10, 0, 5};
Link l_ab = {&a, &b, 10}; Link l_ab = {&a, &b, 10};
//line(&c, 1, 1, 8, 8);
//line(&c, 8, 8, 1, 1);
//line(&c, 0, 5, 8, 8);
for(int i=0; i<100; i++){ while(1){
// clear canvas, calculate next frame and draw
memset(c.data, '.', c.x * c.y);
draw_link(&c, &l_ab); draw_link(&c, &l_ab);
update_point(&a); update_point(&a);
update_point(&b); update_point(&b);
// then render and wait
render(&c);
usleep(1000000/FRAMERATE);
} }
render(&c);
return 0; return 0;
} }