Add shoot info class

src/com/annimon/turrets/ShootInfo.java

@@ -0,0 +1,44 @@
+package com.annimon.turrets;
+
+import java.awt.Color;
+import java.awt.Graphics2D;
+
+/**
+ *
+ * @author aNNiMON
+ */
+public class ShootInfo implements Constants {
+    
+    double x, y, speedX;
+    double windSpeed, vsin, t;
+        
+    public void reset() {
+        t = 0;
+    }
+
+    public void update(boolean server) {
+        final double speedY = vsin - GRAVITATION_ACCELERATION * t;
+        // The longer the missile flight, the greater the wind impact.
+        if (server) x += getDeltaX();
+        else x -= getDeltaX();
+        y += speedY;
+        t += 0.01;
+    }
+
+    public void draw(Graphics2D g) {
+        g.setColor(Color.WHITE);
+        final int rad = 2;
+        g.fillArc((int) x - rad, Constants.HEIGHT - (int) y - rad, rad * 2, rad * 2, 0, 360);
+    }
+
+    public boolean isOver() {
+         return (x < 0) || (x >= Constants.WIDTH) || (y < 0);
+    }
+
+    public boolean isCollideTerrain(Terrain terrain) {
+        return terrain.isCollide((int) x, (int) y);
+    }
+    private double getDeltaX() {
+        return speedX + Math.sin(t) * windSpeed;
+    }
+}