protected override void Draw(GameTime gameTime)
{
if (_colliding)
{
GraphicsDevice.Clear(Color.LightBlue);
}
else if (_broadphaseColliding)
{
GraphicsDevice.Clear(Color.LightGreen);
}
else
{
GraphicsDevice.Clear(Color.White);
}
_spriteBatch.Begin();
_alphaDrawer.Draw();
_betaDrawer.Draw();
PolyDrawer.Draw(_alphaBounds, _pixel, _spriteBatch, Color.DarkSlateGray);
PolyDrawer.Draw(_betaBounds, _pixel, _spriteBatch, Color.DarkSlateGray);
if (_colliding)
{
_alphaProjectionDrawer.Draw(Color.Red);
}
_spriteBatch.End();
base.Draw(gameTime);
}
protected override void LoadContent()
{
_spriteBatch = new SpriteBatch(GraphicsDevice);
_pixel = new Texture2D(GraphicsDevice, 1, 1);
_pixel.SetData(new[] { Color.White });
_polygonAlpha = PolyTypes.CreateDefaultPolygon(_alphaPolyType);
_polygonBeta = PolyTypes.CreateDefaultPolygon(_betaPolyType);
_polygonAlphaProjection = PolyTypes.CreateDefaultPolygon(_alphaPolyType);
_polygonAlpha.SetPosition(new Vector2D(250, 250));
_polygonBeta.SetPosition(new Vector2D(625, 250));
_polygonAlpha.SetScale(200);
_polygonBeta.SetScale(200);
_alphaDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonAlpha);
_betaDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonBeta);
_alphaProjectionDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonAlphaProjection);
_lastKeyState = Keyboard.GetState();
}
protected override void Update(GameTime gameTime)
{
MouseState mState = Mouse.GetState();
KeyboardState kState = Keyboard.GetState();
if (kState.IsKeyDown(Keys.C) && _lastKeyState.IsKeyUp(Keys.C))
{
_alphaPolyType++;
if (_alphaPolyType == 4)
{
_alphaPolyType = 0;
}
_polygonAlpha = PolyTypes.CreateDefaultPolygon(_alphaPolyType, pos: _polygonAlpha.GetPosition(),
rotation: _polygonAlpha.GetRotation(), scale: _polygonAlpha.GetScale());
_alphaDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonAlpha);
_polygonAlphaProjection = PolyTypes.CreateDefaultPolygon(_alphaPolyType,
pos: _polygonAlpha.GetPosition(), rotation: _polygonAlpha.GetRotation(),
scale: _polygonAlpha.GetScale());
_alphaProjectionDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonAlphaProjection);
}
if (kState.IsKeyDown(Keys.V) && _lastKeyState.IsKeyUp(Keys.V))
{
_betaPolyType++;
if (_betaPolyType == 4)
{
_betaPolyType = 0;
}
_polygonBeta = PolyTypes.CreateDefaultPolygon(_betaPolyType, pos: _polygonBeta.GetPosition(),
rotation: _polygonBeta.GetRotation(), scale: _polygonBeta.GetScale());
_betaDrawer = new PolyDrawer(GraphicsDevice, _spriteBatch, _pixel, _polygonBeta);
}
if (kState.IsKeyDown(Keys.Z))
{
UsesBoundingSquares = false;
}
else if (kState.IsKeyDown(Keys.X))
{
UsesBoundingSquares = true;
}
if (mState.LeftButton == ButtonState.Pressed)
{
_polygonAlpha.SetPosition(new Vector2D(mState.Position.X, mState.Position.Y));
}
else if (mState.RightButton == ButtonState.Pressed)
{
_polygonBeta.SetPosition(new Vector2D(mState.Position.X, mState.Position.Y));
}
if (kState.IsKeyDown(Keys.Q))
{
_polygonAlpha.Rotate(MathD.PIOVER2 * gameTime.ElapsedGameTime.TotalSeconds);
}
else if (kState.IsKeyDown(Keys.W))
{
_polygonAlpha.Rotate(-MathD.PIOVER2 * gameTime.ElapsedGameTime.TotalSeconds);
}
if (kState.IsKeyDown(Keys.A))
{
_polygonBeta.Rotate(MathD.PIOVER2 * gameTime.ElapsedGameTime.TotalSeconds);
}
else if (kState.IsKeyDown(Keys.S))
{
_polygonBeta.Rotate(-MathD.PIOVER2 * gameTime.ElapsedGameTime.TotalSeconds);
}
if (kState.IsKeyDown(Keys.E))
{
_polygonAlpha.AddScale(gameTime.ElapsedGameTime.TotalSeconds * 100);
}
else if (kState.IsKeyDown(Keys.R))
{
_polygonAlpha.AddScale(-gameTime.ElapsedGameTime.TotalSeconds * 100);
}
if (kState.IsKeyDown(Keys.D))
{
_polygonBeta.AddScale(gameTime.ElapsedGameTime.TotalSeconds * 100);
}
else if (kState.IsKeyDown(Keys.F))
{
_polygonBeta.AddScale(-gameTime.ElapsedGameTime.TotalSeconds * 100);
}
_broadphaseColliding = false;
_colliding = false;
if (!UsesBoundingSquares)
{
_alphaBounds = _polygonAlpha.GetBoundingBox();
_betaBounds = _polygonBeta.GetBoundingBox();
}
else
{
_alphaBounds = _polygonAlpha.GetBoundingSquare();
_betaBounds = _polygonBeta.GetBoundingSquare();
}
if (_alphaBounds.Overlaps(_betaBounds))
{
_broadphaseColliding = true;
}
_minimumTranslationVector = Collision.CheckCollisionAndRespond(_polygonAlpha, _polygonBeta);
if (_minimumTranslationVector != Vector2D.Zero)
{
_colliding = true;
_polygonAlphaProjection.SetPosition(_polygonAlpha.GetPosition() + _minimumTranslationVector);
_polygonAlphaProjection.SetRotation(_polygonAlpha.GetRotation());
_polygonAlphaProjection.SetScale(_polygonAlpha.GetScale());
}
//if (_colliding && !_broadphaseColliding)
// throw new Exception("Broadphase did not collide when SAT did!");
_lastKeyState = kState;
base.Update(gameTime);
}