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tanks
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Replace π with τ; τ = 2π (http://tauday.com/)

This commit is contained in:
Neale Pickett 2010-07-22 15:23:45 -06:00
parent fb78cd6561
commit 7be64ca1fc
2 changed files with 13 additions and 12 deletions
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16
ctanks.c
View File

@ -14,7 +14,7 @@
#define DUMP_f(v) DUMPf("%s = %f", #v, v)
#define DUMP_p(v) DUMPf("%s = %p", #v, v)
#define DUMP_xy(v) DUMPf("%s = (%f, %f)", #v, v[0], v[1]);
#define DUMP_angle(v) DUMPf("%s = %.3fπ", #v, (v/PI));
#define DUMP_angle(v) DUMPf("%s = %.3fτ", #v, (v/TAU));
#define sq(x) ((x) * (x))
@ -55,7 +55,7 @@ tank_get_turret(struct tank *tank)
void
tank_set_turret(struct tank *tank, float angle)
{
tank->turret.desired = fmodf(angle, 2*PI);
tank->turret.desired = fmodf(angle, TAU);
}
int
@ -253,13 +253,13 @@ tanks_move_tank(struct tanks_game *game,
/* Constrain rot_angle to between -PI and PI */
rot_angle = tank->turret.desired - tank->turret.current;
while (rot_angle < 0) {
rot_angle += 2*PI;
rot_angle += TAU;
}
rot_angle = fmodf(PI + rot_angle, 2*PI) - PI;
rot_angle = fmodf(PI + rot_angle, TAU) - PI;
rot_angle = min(TANK_MAX_TURRET_ROT, rot_angle);
rot_angle = max(-TANK_MAX_TURRET_ROT, rot_angle);
tank->turret.current = fmodf(tank->turret.current + rot_angle, 2*PI);
tank->turret.current = fmodf(tank->turret.current + rot_angle, TAU);
}
/* Fakey acceleration */
@ -322,9 +322,9 @@ tanks_move_tank(struct tanks_game *game,
The fraction of the circle traveled is equal to the speed
of the outer tread over the circumference of the circle:
Ft = So/(2*pi*r)
Ft = So/(tau*r)
The angle traveled is:
theta = Ft * 2*pi
theta = Ft * tau
This reduces to a simple
theta = So/r
We multiply it by dir to adjust for the direction of rotation
@ -336,7 +336,7 @@ tanks_move_tank(struct tanks_game *game,
}
/* Now move the tank */
tank->angle = fmodf(tank->angle + angle + 2*PI, 2*PI);
tank->angle = fmodf(tank->angle + angle + TAU, TAU);
{
float m[2];

7
ctanks.h
View File

@ -2,6 +2,7 @@
#define __CTANKS_H__
/* Some useful constants */
#define TAU 6.28318530717958647692
#define PI 3.14159265358979323846
#define TANK_MAX_SENSORS 10
@ -10,7 +11,7 @@
#define TANK_CANNON_RECHARGE 20 /* Turns to recharge cannon */
#define TANK_CANNON_RANGE (TANK_SENSOR_RANGE / 2)
#define TANK_MAX_ACCEL 35
#define TANK_MAX_TURRET_ROT (PI/10)
#define TANK_MAX_TURRET_ROT (TAU/20)
#define TANK_TOP_SPEED 7
/* (tank radius + tank radius)^2 */
@ -27,8 +28,8 @@
((TANK_CANNON_RANGE + TANK_RADIUS) * (TANK_CANNON_RANGE + TANK_RADIUS))
#ifndef rad2deg
#define rad2deg(r) ((int)(180*(r)/PI))
#define deg2rad(r) ((r*PI)/180)
#define rad2deg(r) ((int)(360*(r)/TAU))
#define deg2rad(r) ((r*TAU)/360)
#endif
#ifndef max