Diff: bullet.cpp

Revision:

15:4b27a3a95772

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bullet.cpp	Mon Oct 26 04:12:35 2015 +0000
@@ -0,0 +1,55 @@
+#include "bullet.h"
+#include "game_synchronizer.h"
+#include "globals.h"
+#include "math.h"
+
+extern Game_Synchronizer sync;
+
+Bullet::Bullet(Tank* t) {
+    tank = t;
+    speed = 30;
+    in_flight = false;
+}
+void Bullet::shoot(void) {
+    if(in_flight) {return;}
+    time = 0;
+    tank->barrel_end(x0, y0);
+    x = x0; y = y0;
+    vx0 = speed*cos(tank->barrel_theta);
+    vy0 = speed*sin(tank->barrel_theta);
+    in_flight = true; 
+}
+
+int Bullet::time_step(float dt) {
+    if(!in_flight) {return 0;}
+    time += dt;
+    int new_x = x0 + vx0*time;
+    int new_y = y0 + vy0*time + 0.5*(-9.81)*time*time;
+    
+    if(new_x == x && new_y == y) {      // Didn't move!
+        return 0;
+    }
+    
+    if(new_x < 0 || new_x > 128 || new_y < 0 || new_y > 128) {
+        in_flight = false;
+        return 0;
+    }
+    
+    int col = sync.read_pixel(new_x, new_y);
+    if(col != CONVERT_24_TO_16_BPP(SKY_COLOR)) {
+        sync.pixel(x, y, SKY_COLOR);
+        sync.filled_circle(new_x, new_y, 4, SKY_COLOR);
+        in_flight = false;
+        
+        if(col == CONVERT_24_TO_16_BPP(TANK_BLUE)) {
+            return 1;
+        }
+        return 0;
+    }
+    sync.pixel(x, y, SKY_COLOR);
+            
+    x = new_x;
+    y = new_y;            
+    sync.pixel(x, y, BLACK);
+    return 0;
+}