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2D drawing basics

2D drawing basics. For CSE 3902 By : Matt Boggus. Overview. 2D coordinate systems Raster images Sprite drawing in XNA. Coordinate system. A coordinate system is a system which uses one or more numbers, or coordinates , to uniquely determine the position of a point

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2D drawing basics

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  1. 2D drawing basics For CSE 3902 By: Matt Boggus

  2. Overview • 2D coordinate systems • Raster images • Sprite drawing in XNA

  3. Coordinate system • A coordinate system is a system which uses one or more numbers, or coordinates, to uniquely determine the position of a point • For a 2D coordinate system, we need • Origin • 2-Tuple of position relative to the origin

  4. 2D coordinate system examples Cartesian Coordinates (http://en.wikipedia.org/wiki/File:Cartesian-coordinate-system.svg) Polar Coordinates (http://en.wikipedia.org/wiki/File:CircularCoordinates.svg)

  5. XNA’s coordinate system

  6. Raster images http://en.wikipedia.org/wiki/File:Rgb-raster-image.svg

  7. Raster image types • PPM • Uncompressed, human readable • GIF • 8 bits per pixel per channel (RGB) • JPEG • Lossy data compression • PNG • Lossless data compression

  8. Sprite drawing in XNA • SpriteBatch object • Begin (call once to start specifying sprites to draw) • Draw (each call specifies another sprite to draw) • End (call once to finish specifying sprites to draw)

  9. SpriteBatch Draw methods Example Image File / Texture2D public void Draw ( Texture2D texture, Rectangle destinationRectangle, Color color ) public void Draw ( Texture2D texture, Rectangle destinationRectangle, Nullable<Rectangle> sourceRectangle, Color color ) Drawing window XNA rectangle object

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