/// <summary>
/// creates the enemy graphic by fetching the 4 points of the enemy
/// </summary>
/// <param name="tank">pass in the position of the enemy tank</param>
/// <returns>return the array of enemytank points</returns>
private PointF[] CreateEnemiesGraphic(AITanks tank)
{
//create an array of enemy tank points
PointF[] tankPoints = new PointF[4];
//se the points of the enemy tank
tankPoints[0] = new PointF(tank.Location.X, tank.Location.Y);
tankPoints[1] = new PointF(tank.Location.X + tank.Size.Width, tank.Location.Y);
tankPoints[2] = new PointF(tank.Location.X + tank.Size.Width, tank.Location.Y + tank.Size.Height);
tankPoints[3] = new PointF(tank.Location.X, tank.Location.Y + tank.Size.Height);
return(tankPoints);
}
/// <summary>
/// create the graphic for the enemy barrel by fetching the 4 points
/// </summary>
/// <param name="tank"> pass in the location of the enemy tank </param>
/// <returns></returns>
private PointF[] CreateEnemyBarrelGraphic(AITanks tank)
{
//make array for the barrel points
Point[] basePoints = new Point[4];
// if the player is on the right side of the enemy
// add one to see if it fixes graphic glitch
if (player.Location.X > tank.Location.X + 1)
{
// top left corner
basePoints[0] = new Point(-5, -2);
//top right corner
basePoints[1] = new Point(25, -2);
//bottom right corner
basePoints[2] = new Point(25, 2);
//bottom left corner
basePoints[3] = new Point(-5, 2);
}
//if the player is on the right side of the enemy
//add one to see if it fixes graphics glitch
else if (player.Location.X < tank.Location.X + 1)
{
// top left corner
basePoints[0] = new Point(-25, -2);
//top right corner
basePoints[1] = new Point(5, -2);
//bottom right corner
basePoints[2] = new Point(5, 2);
//bottom left corner
basePoints[3] = new Point(-25, 2);
}
// when the player is directly above or below the enemy
else if (player.Location.X == tank.Location.X)
{
//when the player is below the enemy
if (player.Location.Y > tank.Location.Y)
{
// top left corner
basePoints[0] = new Point(-25, -2);
//top right corner
basePoints[1] = new Point(5, -2);
//bottom right corner
basePoints[2] = new Point(5, 2);
//bottom left corner
basePoints[3] = new Point(-25, 2);
}
// when the player is above the eenemy
else
{
// top left corner
basePoints[0] = new Point(-5, -2);
//top right corner
basePoints[1] = new Point(25, -2);
//bottom right corner
basePoints[2] = new Point(25, 2);
//bottom left corner
basePoints[3] = new Point(-5, 2);
}
}
//calculate the theta angle for the barrel calcualtions
float angle = -(float)Math.Atan((tank.Location.Y - player.Location.Y + (tank.Size.Height / 2)) / (player.Location.X - tank.Location.X - (tank.Size.Width / 2)));
//Barrel Points Array for the modified points
PointF[] barrelPoints = new PointF[4];
// put the cos and sin theta calculations in their own variables to make equation less messy
float cos = (float)Math.Cos(angle);
float sin = (float)Math.Sin(angle);
// put the base points into the barrel point
for (int i = 0; i < 4; i++)
{
//calculate where the points need to go and move the barrel to where the enemy is
barrelPoints[i] = new PointF(basePoints[i].X * cos + basePoints[i].Y * sin + tank.Location.X + 10, basePoints[i].X * sin - basePoints[i].Y * cos + tank.Location.Y + 10);
}
return(barrelPoints);
}