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input.c
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input.c
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/////////////////////////////////////////////////////////////////////
// Game Programming All In One, Third Edition
// Tank War Enhancement 5 - input.c
/////////////////////////////////////////////////////////////////////
#include "tankwar.h"
void forward(int num)
{
//use xspeed as a generic "speed" variable
tanks[num]->xspeed++;
if (tanks[num]->xspeed > MAXSPEED)
tanks[num]->xspeed = MAXSPEED;
}
void backward(int num)
{
tanks[num]->xspeed--;
if (tanks[num]->xspeed < -MAXSPEED)
tanks[num]->xspeed = -MAXSPEED;
}
void turnleft(int num)
{
tanks[num]->dir--;
if (tanks[num]->dir < 0)
tanks[num]->dir = 7;
}
void turnright(int num)
{
tanks[num]->dir++;
if (tanks[num]->dir > 7)
tanks[num]->dir = 0;
}
void getinput()
{
//hit ESC to quit
if (key[KEY_ESC]) gameover = 1;
//WASD - SPACE keys control tank 1
if (key[KEY_W]) forward(0);
if (key[KEY_D]) turnright(0);
if (key[KEY_A]) turnleft(0);
if (key[KEY_S]) backward(0);
if (key[KEY_SPACE]&& loopcnt==LOOPDELAY) {fireweapon(0);
loopcnt=0;
}
//arrow - ENTER keys control tank 2
if (key[KEY_UP]) forward(1);
if (key[KEY_RIGHT]) turnright(1);
if (key[KEY_DOWN]) backward(1);
if (key[KEY_LEFT]) turnleft(1);
if (key[KEY_ENTER]&& loopcnt==LOOPDELAY) {fireweapon(1);
loopcnt=0;
}
//short delay after keypress
rest(20);
}