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-rw-r--r--main.c66
1 files changed, 60 insertions, 6 deletions
diff --git a/main.c b/main.c
index 42fbaf8..70c30a0 100644
--- a/main.c
+++ b/main.c
@@ -8,6 +8,8 @@
#include "dat.h"
#include "fns.h"
+double PIX2M = 5;
+
Mousectl *mc;
Keyboardctl *kc;
Channel *scrsync;
@@ -56,7 +58,7 @@ void
ball.v = addpt2(ball.v, mulpt2(addpt2(Vec2(0,-Eg), divpt2(Fd, ball.mass)), Δt));
ball.p = addpt2(ball.p, mulpt2(ball.v, Δt));
snprint(stats[Spos], sizeof(stats[Spos]), "p: %v", ball.p);
- snprint(stats[Sdrag], sizeof(stats[Sdrag]), "Fd: %v", Fd);
+ snprint(stats[Sdrag], sizeof(stats[Sdrag]), "Fd: %v", divpt2(Fd, ball.mass));
if(ball.p.y <= (2+1)*M2PIX){
ball.p.y = (2+1)*M2PIX;
ball.v = Vec2(0,0);
@@ -91,21 +93,49 @@ mmb(void)
{
enum {
SETV0,
+ SETPOS,
+ SETMASS,
+ SETDIAM,
};
static char *items[] = {
[SETV0] "set v0",
+ [SETPOS] "set position",
+ [SETMASS] "set mass",
+ [SETDIAM] "set diameter",
nil
};
static Menu menu = { .item = items };
- char buf[32];
+ char buf[32], *p;
- snprint(buf, sizeof(buf), "%g", v0);
switch(menuhit(2, mc, &menu, nil)){
case SETV0:
+ snprint(buf, sizeof(buf), "%g", v0);
enter("v0(m/s):", buf, sizeof(buf), mc, kc, nil);
if(buf[0] != 0)
v0 = strtod(buf, nil);
break;
+ case SETPOS:
+ snprint(buf, sizeof(buf), "%g, %g", ball.p.x, ball.p.y);
+ enter("pos(x,y):", buf, sizeof(buf), mc, kc, nil);
+ if(buf[0] != 0 && (p = strchr(buf, ',')) != nil){
+ ball.p.x = strtod(buf, nil);
+ ball.p.y = strtod(p+1, nil);
+ }
+ break;
+ case SETMASS:
+ snprint(buf, sizeof(buf), "%g", ball.mass);
+ enter("mass(kg):", buf, sizeof(buf), mc, kc, nil);
+ if(buf[0] != 0)
+ ball.mass = strtod(buf, nil);
+ break;
+ case SETDIAM:
+ snprint(buf, sizeof(buf), "%g", 2*ball.r);
+ enter("diameter(m):", buf, sizeof(buf), mc, kc, nil);
+ if(buf[0] != 0){
+ ball.r = strtod(buf, nil)/2;
+ A = 2*PI*ball.r*ball.r; /* ½(4πr²) */
+ }
+ break;
}
}
@@ -134,6 +164,24 @@ rmb(void)
}
void
+zoomin(void)
+{
+ PIX2M += 0.01;
+ worldrf.bx = Vec2(PIX2M,0);
+ worldrf.by = Vec2(0,-PIX2M);
+ snprint(stats[Sscale], sizeof(stats[Sscale]), "s: %gm/pix", M2PIX);
+}
+
+void
+zoomout(void)
+{
+ PIX2M -= 0.01;
+ worldrf.bx = Vec2(PIX2M,0);
+ worldrf.by = Vec2(0,-PIX2M);
+ snprint(stats[Sscale], sizeof(stats[Sscale]), "s: %gm/px", M2PIX);
+}
+
+void
mouse(void)
{
Point2 p;
@@ -154,6 +202,10 @@ mouse(void)
mmb();
if((mc->buttons & 4) != 0)
rmb();
+ if((mc->buttons & 8) != 0)
+ zoomin();
+ if((mc->buttons & 16) != 0)
+ zoomout();
}
void
@@ -215,16 +267,18 @@ threadmain(int argc, char *argv[])
if(statc == nil)
sysfatal("allocimage: %r");
+ snprint(stats[Sscale], sizeof(stats[Sscale]), "s: %gm/pix", M2PIX);
+
worldrf.p = Pt2(screen->r.min.x, screen->r.max.y, 1);
worldrf.bx = Vec2(PIX2M,0);
worldrf.by = Vec2(0,-PIX2M);
ball.p = Pt2((2+1)*M2PIX,(2+1)*M2PIX,1);
ball.v = Vec2(0, 0);
- ball.mass = 106000;
- ball.r = 0.1; /* 10cm */
+ ball.mass = 0.149;
+ ball.r = 0.375; /* 3.75cm */
A = 2*PI*ball.r*ball.r; /* ½(4πr²) */
- v0 = 1640; /* Paris Gun's specs */
+ v0 = 53.64; /* avg baseball hit speed */
scrsync = chancreate(1, 0);
display->locking = 1;