/// <summary>
/// A streak of lightning is drawn simply by piecing together a long string of small line segments,
/// each of which is slightly rotated.
/// </summary>
private void DrawLightningStreak(LineBatch lineBatch, Color color, Vector2 start, Vector2 end, int numSegments,
float deviation)
{
Random randomGen = new Random();
Vector2 disp = end - start;
Vector2 unitDisp = Vector2.Normalize(disp);
Vector2 stepVector = unitDisp * disp.Length() / (float)numSegments;
Vector2 perpVec = new Vector2(-stepVector.Y, stepVector.X);
perpVec.Normalize();
Vector2 startPoint = start;
Vector2 endPoint = new Vector2();
for (int i = 0; i < numSegments; ++i)
{
endPoint = start + stepVector * (i + 1);
// If this is an intermediate segment, apply an offset perpendicular to the line connecting start to end.
if (i < numSegments - 1)
{
float random = (float)randomGen.NextDouble();
float offset = (random >= 0.5f ? 1 : -1) * random * deviation;
endPoint += perpVec * offset;
}
lineBatch.DrawLine(startPoint, endPoint, color);
startPoint = endPoint;
}
}
/// <summary>
/// This draws the box with streaks of lightning representing its edges.
/// </summary>
public void Draw(LineBatch lineBatch, Color color, int numSegments, float deviation)
{
// Let's compute the coordinates of all the vertices to make the line drawing simpler.
Vector2 upperLeft = new Vector2(rectangle.Left, rectangle.Top);
Vector2 upperRight = new Vector2(rectangle.Right, rectangle.Top);
Vector2 lowerLeft = new Vector2(rectangle.Left, rectangle.Bottom);
Vector2 lowerRight = new Vector2(rectangle.Right, rectangle.Bottom);
// Now draw the lightning streaks.
DrawLightningStreak(lineBatch, color, upperLeft, upperRight, numSegments, deviation);
DrawLightningStreak(lineBatch, color, upperRight, lowerRight, numSegments, deviation);
DrawLightningStreak(lineBatch, color, lowerRight, lowerLeft, numSegments, deviation);
DrawLightningStreak(lineBatch, color, lowerLeft, upperLeft, numSegments, deviation);
}
/// <summary>
/// Draws the grid, showing the springs connecting neighboring nodes as line segments. The color of each
/// line segment is interpolated linearly between dimColor and brightColor depending on the length
/// of the segment.
/// </summary>
public void Draw(LineBatch lineBatch, Color dimColor, Color brightColor)
{
float dx = (bounds.Right - bounds.Left) / gridSize;
float dy = (bounds.Bottom - bounds.Top) / gridSize;
Vector4 vecDimColor = new Vector4(dimColor.R, dimColor.G, dimColor.B, dimColor.A);
Vector4 vecBrightColor = new Vector4(brightColor.R, brightColor.G, brightColor.B, brightColor.A);
for (int x = 0; x < gridSize; ++x)
{
for (int y = 0; y < gridSize; ++y)
{
if (x < gridSize - 1)
{
float lineLength = (grid[x + 1, y].Position - grid[x, y].Position).Length();
float t = (lineLength - dx) / (5 * (float)Math.Sqrt(2) * dx);
Vector4 modulatedColorVec = Vector4.Lerp(vecDimColor, vecBrightColor, t);
Color modulatedColor = new Color((byte)modulatedColorVec.X, (byte)modulatedColorVec.Y, (byte)modulatedColorVec.Z,
(byte)modulatedColorVec.W);
lineBatch.DrawLine(grid[x, y].Position, grid[x + 1, y].Position, modulatedColor);
}
if (y < gridSize - 1)
{
float lineLength = (grid[x, y + 1].Position - grid[x, y].Position).Length();
float t = (lineLength - dy) / (5 * (float)Math.Sqrt(2) * dx);
Vector4 modulatedColorVec = Vector4.Lerp(vecDimColor, vecBrightColor, t);
Color modulatedColor = new Color((byte)modulatedColorVec.X, (byte)modulatedColorVec.Y, (byte)modulatedColorVec.Z,
(byte)modulatedColorVec.W);
lineBatch.DrawLine(grid[x, y].Position, grid[x, y + 1].Position, modulatedColor);
}
}
}
}
/// <summary>
/// Frees graphics content
/// </summary>
public override void UnloadGraphicsContent(bool unloadAllContent)
{
if (unloadAllContent)
{
if (spriteBatch != null)
{
spriteBatch.Dispose();
spriteBatch = null;
}
if (lineBatch != null)
{
lineBatch.Dispose();
lineBatch = null;
}
content.Unload();
actorManager.Unload();
}
}
/// <summary>
/// Loads graphics content needed for the game.
/// </summary>
public override void LoadGraphicsContent(bool loadAllContent)
{
if (loadAllContent)
{
if (content == null)
content = new ContentManager(ScreenManager.Game.Services, "Content");
grid = new MassSpringGrid(60, 5f, 100f, 0.5f,
new Rectangle(safeAreaWidth, safeAreaHeight, screenSafeWidth, screenSafeHeight));
actorManager = new ActorManager();
#region Allocate graphics content
spriteBatch = new SpriteBatch(ScreenManager.GraphicsDevice);
lineBatch = new LineBatch(ScreenManager.GraphicsDevice);
starTexture = content.Load<Texture2D>("blank");
Animation countdownAnim = new Animation(content, 300, 100);
countdownAnim.AddFrame(new AnimationFrame(TimeSpan.FromSeconds(2.0f / 3.0f), "ready"));
countdownAnim.AddFrame(new AnimationFrame(TimeSpan.FromSeconds(2.0f / 3.0f), "set"));
countdownAnim.AddFrame(new AnimationFrame(TimeSpan.FromSeconds(2.0f / 3.0f), "go"));
countdownSprite = new Sprite();
countdownSprite.AddAnimation("default", countdownAnim);
countdownSprite.SetCurrentAnimation("default");
#endregion
#region Set up lightning boxes
playerLightningBox = new LightningBox(new Rectangle(safeAreaWidth + 10, screenHeight - safeAreaHeight - 38 - 150, screenSafeWidth - 30, 150));
computerLightningBox = new LightningBox(new Rectangle(safeAreaWidth + 10, safeAreaHeight + 38, screenSafeWidth - 30, 150));
#endregion
#region Collision Categories for physics
// Collision Categories:
//
// 1 = player paddle
// 10 = ball
// 11 = gravity ball
// 12 = obstacle
// 13 = computer paddle
// 14 = bullet
// 20 = screen borders
// 21 = player lightning box
// 22 = borders for obstacles
// 23 = computer lightning box
#endregion
#region Create Player Paddle Actor Template
Actor playerPaddleTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new GamePadPaddleController(actorManager),
new DistortGridBehavior(actorManager, grid, DistortGridDetail.High),
new ConstrainToRectangleBehavior(actorManager, playerLightningBox.Rectangle,
Physics.Enums.CollisionCategories.Cat21) },
content, "paddle", 100, 100 * 0.174089069f);
playerPaddleTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateRectangleBody(playerPaddleTemplate.Sprite.Width,
playerPaddleTemplate.Sprite.Height, 1);
playerPaddleTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateRectangleGeom(playerPaddleTemplate.PhysicsBody,
playerPaddleTemplate.Sprite.Width, playerPaddleTemplate.Sprite.Height);
playerPaddleTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat1;
playerPaddleTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat1 |
Physics.Enums.CollisionCategories.Cat10 |
Physics.Enums.CollisionCategories.Cat11;
playerPaddleTemplate.PhysicsBody.LinearDragCoefficient = 0.01f;
playerPaddleTemplate.PhysicsBody.RotationalDragCoefficient = 300.0f;
actorManager.AddActorTemplate(playerPaddleTemplate, "Player Paddle");
#endregion
#region Create Computer Paddle Actor Template
Actor computerPaddleTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new DistortGridBehavior(actorManager, grid, DistortGridDetail.High),
new ConstrainToRectangleBehavior(actorManager, computerLightningBox.Rectangle,
Physics.Enums.CollisionCategories.Cat23),
new AIPaddleController(actorManager) },
content, "paddle2", 100, 100 * 0.174089069f);
computerPaddleTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateRectangleBody(playerPaddleTemplate.Sprite.Width,
playerPaddleTemplate.Sprite.Height, 1);
computerPaddleTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateRectangleGeom(playerPaddleTemplate.PhysicsBody,
playerPaddleTemplate.Sprite.Width, playerPaddleTemplate.Sprite.Height);
computerPaddleTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat13;
computerPaddleTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat13 |
Physics.Enums.CollisionCategories.Cat10 | Physics.Enums.CollisionCategories.Cat11;
computerPaddleTemplate.PhysicsBody.LinearDragCoefficient = 0.01f;
computerPaddleTemplate.PhysicsBody.RotationalDragCoefficient = 300.0f;
actorManager.AddActorTemplate(computerPaddleTemplate, "Computer Paddle");
#endregion
#region Create Obstacle Actor Template
Actor obstacleActorTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new DistortGridBehavior(actorManager, grid, DistortGridDetail.High),
new ConstrainToRectangleBehavior(actorManager, new Rectangle(
computerLightningBox.Rectangle.X,
computerLightningBox.Rectangle.Y + computerLightningBox.Rectangle.Height,
computerLightningBox.Rectangle.Width,
playerLightningBox.Rectangle.Y - (computerLightningBox.Rectangle.Y + computerLightningBox.Rectangle.Height)),
Physics.Enums.CollisionCategories.Cat22),
new ShootOffRandomlyBehavior(actorManager, 300, 350),
new InteractWithBlackHolesBehavior(actorManager) },
content, "obstacle", 45.0f, 45.0f);
obstacleActorTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateRectangleBody(obstacleActorTemplate.Sprite.Width,
obstacleActorTemplate.Sprite.Height, 0.001f);
obstacleActorTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateRectangleGeom(obstacleActorTemplate.PhysicsBody,
obstacleActorTemplate.Sprite.Width, obstacleActorTemplate.Sprite.Height);
obstacleActorTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat12;
obstacleActorTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat1 |
Physics.Enums.CollisionCategories.Cat10 | Physics.Enums.CollisionCategories.Cat11 |
Physics.Enums.CollisionCategories.Cat12;
obstacleActorTemplate.PhysicsBody.LinearDragCoefficient = 0.0f;
actorManager.AddActorTemplate(obstacleActorTemplate, "Obstacle");
#endregion
#region Create Ball Actor Template
float ballDiameter = 25.0f;
Actor ballTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new DistortGridBehavior(actorManager, grid, DistortGridDetail.High),
new ConstrainToRectangleBehavior(actorManager, new Rectangle(safeAreaWidth, safeAreaHeight, screenSafeWidth, screenSafeHeight),
Physics.Enums.CollisionCategories.Cat20),
new ShootOffRandomlyBehavior(actorManager, 300, 301.0f),
new InteractWithBlackHolesBehavior(actorManager) },
content, "ball", ballDiameter, ballDiameter);
ballTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateCircleBody(ballDiameter / 2.0f, 0.001f);
ballTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateCircleGeom(ballTemplate.PhysicsBody, ballDiameter / 2.0f, 16);
ballTemplate.PhysicsBody.LinearDragCoefficient = 0.0f;
ballTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat10;
ballTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat1 |
Physics.Enums.CollisionCategories.Cat10 |
Physics.Enums.CollisionCategories.Cat13;
actorManager.AddActorTemplate(ballTemplate, "Ball");
#endregion
#region Create Gravity Ball Actor Template
float gravityBallDiameter = 55.0f;
Actor gravBallTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new BlackHoleBehavior(actorManager, grid),
new ConstrainToRectangleBehavior(actorManager, new Rectangle(safeAreaWidth, safeAreaHeight, screenSafeWidth, screenSafeHeight),
Physics.Enums.CollisionCategories.Cat20),
new LiveTemporarilyBehavior(actorManager, TimeSpan.FromSeconds(2.9f), TimeSpan.FromSeconds(0.5)) },
content, "GravityBall", gravityBallDiameter, 2.0f);
gravBallTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateCircleBody(gravityBallDiameter / 2.0f, 3.0f);
gravBallTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateCircleGeom(gravBallTemplate.PhysicsBody,
gravityBallDiameter / 2.0f, 16);
gravBallTemplate.PhysicsBody.LinearDragCoefficient = 0.0f;
gravBallTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat11;
gravBallTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat11 |
Physics.Enums.CollisionCategories.Cat10 | Physics.Enums.CollisionCategories.Cat1 |
Physics.Enums.CollisionCategories.Cat13;
actorManager.AddActorTemplate(gravBallTemplate, "Gravity Ball");
#endregion
#region Create Bullet Actor Template
float bulletDiameter = 5.0f;
Actor bulletTemplate = new Actor(ScreenManager.Game,
new ActorBehavior[] { new ConstrainToRectangleBehavior(actorManager, new Rectangle(safeAreaWidth, safeAreaHeight, screenSafeWidth, screenSafeHeight),
Physics.Enums.CollisionCategories.Cat20),
new DieUponCollisionBehavior(actorManager),
new InteractWithBlackHolesBehavior(actorManager) },
content, "projectile", bulletDiameter, bulletDiameter);
bulletTemplate.PhysicsBody =
Physics.Dynamics.BodyFactory.Instance.CreateCircleBody(bulletDiameter / 2.0f, 0.001f);
bulletTemplate.PhysicsGeom =
Physics.Collisions.GeomFactory.Instance.CreateCircleGeom(bulletTemplate.PhysicsBody, bulletDiameter / 2.0f, 16);
bulletTemplate.PhysicsBody.LinearDragCoefficient = 0.0f;
bulletTemplate.PhysicsGeom.CollisionCategories = Physics.Enums.CollisionCategories.Cat14;
bulletTemplate.PhysicsGeom.CollidesWith = Physics.Enums.CollisionCategories.Cat1 |
Physics.Enums.CollisionCategories.Cat10 | Physics.Enums.CollisionCategories.Cat11 |
Physics.Enums.CollisionCategories.Cat12 | Physics.Enums.CollisionCategories.Cat13;
actorManager.AddActorTemplate(bulletTemplate, "Bullet");
#endregion
#region Place basic gameplay objects
playerPaddle = actorManager.InstantiateTemplate("Player Paddle");
playerPaddle.PhysicsBody.Position = new Vector2(safeAreaWidth + screenSafeWidth / 2.0f, screenHeight - safeAreaHeight - 38 - 150 / 2);
computerPaddle = actorManager.InstantiateTemplate("Computer Paddle");
computerPaddle.PhysicsBody.Position = new Vector2(safeAreaWidth + screenSafeWidth / 2.0f, safeAreaHeight + 38 + 150 / 2);
ball = actorManager.InstantiateTemplate("Ball");
ball.PhysicsBody.Position = new Vector2(safeAreaWidth + screenSafeWidth / 2, safeAreaHeight + screenSafeHeight / 2);
PauseBallForNewRound();
ShootOffRandomlyBehavior shootOffBehavior = (ShootOffRandomlyBehavior)ball.GetBehavior(typeof(ShootOffRandomlyBehavior));
shootOffBehavior.JustStarting = false;
AIPaddleController ai = (AIPaddleController)computerPaddle.GetBehavior(typeof(AIPaddleController));
ai.Ball = ball;
PopulateArenaWithObstacles();
#endregion
}
// Set the projection matrix for the line batch
lineBatch.SetProjection(Matrix.CreateOrthographicOffCenter(
0.0f, ScreenManager.GraphicsDevice.Viewport.Width,
ScreenManager.GraphicsDevice.Viewport.Height, 0.0f, 0.0f, 1.0f));
}
