public void Draw(Camera2D camera, bool useMapBackgroundColor = false)
{
// it's important to get the camera state before setting the render target
// because the render target changes the size of the viewport
var boundingRectangle = camera.GetBoundingRectangle();
var viewMatrix = camera.GetViewMatrix();
var viewport = _graphicsDevice.Viewport;
_graphicsDevice.SetRenderTarget(_renderTarget);
if (useMapBackgroundColor && BackgroundColor.HasValue)
{
_graphicsDevice.Clear(BackgroundColor.Value);
}
else
{
_graphicsDevice.Clear(Color.Transparent);
}
foreach (var layer in _layers)
{
layer.Draw(boundingRectangle);
}
_graphicsDevice.SetRenderTarget(null);
_graphicsDevice.Viewport = viewport;
_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.NonPremultiplied, SamplerState.PointClamp, transformMatrix: viewMatrix);
_spriteBatch.Draw(_renderTarget, Vector2.Zero, Color.White);
_spriteBatch.End();
}
public bool IsInView(Sprite sprite)
{
// if not within the horizontal bounds of the screen
if (sprite.Position.X - sprite.Texture.Width > camera.Position.X + camera.GetBoundingRectangle().Width || sprite.Position.X + sprite.Texture.Width < camera.Position.X)
{
return(false);
}
// if not within the vertical bounds of the screen
if (sprite.Position.Y - sprite.Texture.Height > camera.Position.Y + camera.GetBoundingRectangle().Height || sprite.Position.Y + sprite.Texture.Height < camera.Position.Y)
{
return(false);
}
// if in view
return(true);
}
public void Camera2D_GetBoundingRectangle_Test()
{
var graphicsDevice = TestHelper.CreateGraphicsDevice();
var viewport = new DefaultViewportAdapter(graphicsDevice);
var camera = new Camera2D(viewport);
camera.Move(new Vector2(2, 0));
camera.Move(new Vector2(0, 3));
var boundingRectangle = camera.GetBoundingRectangle();
Assert.AreEqual(2, boundingRectangle.Left, 0.01);
Assert.AreEqual(3, boundingRectangle.Top, 0.01);
Assert.AreEqual(802, boundingRectangle.Right, 0.01);
Assert.AreEqual(483, boundingRectangle.Bottom, 0.01);
}
public void Camera2D_GetBoundingRectangle_Test()
{
var graphicsDevice = TestHelper.CreateGraphicsDevice();
var viewport = new DefaultViewportAdapter(graphicsDevice);
var camera = new Camera2D(viewport);
camera.Move(new Vector2(2, 0));
camera.Move(new Vector2(0, 3));
var boundingRectangle = camera.GetBoundingRectangle();
Assert.AreEqual(2, boundingRectangle.Left, 0.01);
Assert.AreEqual(3, boundingRectangle.Top, 0.01);
Assert.AreEqual(802, boundingRectangle.Right, 0.01);
Assert.AreEqual(483, boundingRectangle.Bottom, 0.01);
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
// the camera produces a view matrix that can be applied to any sprite batch
var transformMatrix = _camera.GetViewMatrix(Vector2.Zero);
_spriteBatch.Begin(transformMatrix: transformMatrix);
_spriteBatch.Draw(_backgroundSky, Vector2.Zero, Color.White);
_spriteBatch.Draw(_backgroundClouds, new Vector2(-_cloudsOffset, 0), Color.White);
_spriteBatch.Draw(_backgroundClouds, new Vector2(_cloudsOffset, 10), Color.White);
_spriteBatch.End();
for (var layerIndex = 0; layerIndex < 4; layerIndex++)
{
// different layers can have a parallax factor applied for a nice depth effect
var parallaxFactor = Vector2.One * (0.25f * layerIndex);
var viewMatrix = _camera.GetViewMatrix(parallaxFactor);
_spriteBatch.Begin(transformMatrix: viewMatrix);
for (var repeatIndex = -3; repeatIndex <= 3; repeatIndex++)
{
var texture = _backgroundHills[layerIndex];
var position = new Vector2(repeatIndex * texture.Width, 0);
_spriteBatch.Draw(texture, position, Color.White);
}
_spriteBatch.End();
}
// not all sprite batches need to be affected by the camera
var rectangle = _camera.GetBoundingRectangle();
var stringBuilder = new StringBuilder();
stringBuilder.AppendLine($"WASD: Move [{_camera.Position.X:0}, {_camera.Position.Y:0}]");
stringBuilder.AppendLine($"EQ: Rotate [{MathHelper.ToDegrees(_camera.Rotation):0.00}]");
stringBuilder.AppendLine($"RF: Zoom [{_camera.Zoom:0.00}]");
stringBuilder.AppendLine($"World Pos: [{_worldPosition.X:0}, {_worldPosition.Y:0}]");
stringBuilder.AppendLine($"Bounds: [{rectangle.X:0}, {rectangle.Y:0}, {rectangle.Width:0}, {rectangle.Height:0}]");
_spriteBatch.Begin(blendState: BlendState.AlphaBlend);
_spriteBatch.DrawString(_bitmapFont, stringBuilder.ToString(), new Vector2(5, 5), Color.DarkBlue);
_spriteBatch.End();
base.Draw(gameTime);
}
public static void Draw(this SpriteBatch spriteBatch, TiledLayer layer, Camera2D camera)
{
layer.Draw(spriteBatch, camera.GetBoundingRectangle().ToRectangle());
}
public void Draw(SpriteBatch spriteBatch, Camera2D camera)
{
var visibleRectangle = camera.GetBoundingRectangle().ToRectangle();
Draw(spriteBatch, visibleRectangle);
}
public static void Draw(this SpriteBatch spriteBatch, TiledLayer layer, Camera2D camera)
{
layer.Draw(spriteBatch, camera.GetBoundingRectangle().ToRectangle());
}