BGRABitmap tutorial

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Welcome to the index of the tutorials for the BGRABitmap library. You can browse tutorials by number with the bar on the top, or by the following categories:

Install BGRABitmap and draw basic shapes

TBGRABitmap images have drawing functions using floating point coordinates or integer coordinates.

• Installing BGRABitmap (No. 1)
• Loading and displaying an image (No. 2)
• Drawing with the mouse (No. 3)
• Line styles (No. 6)
• Splines and Bézier curves (No. 7)
• Text functions (No. 12)
• Integer coordinates and floating point coordinates (No. 13)

Textures and scanners

Pixels are a table in memory containing values in the TBGRAPixel format. At this level, we can do various operations:

• Direct pixel access with Scanline (No. 4)
• Combining layers of pixels (No. 5)
• Generating textures (No. 8)
• Phong shading using textures (No. 9)
• Texture mapping (No. 10)
• Using scanners to combine transformations (No. 11)

Other drawing contexts

It is possible to have other contexts, that provide/allow other basic drawing functions:

• Standard Canvas (Canvas and CanvasOpacity properties) : avoid using it because of the slowness of conversions of bitmap data
• Canvas with features brought by BGRABitmap (CanvasBGRA property, Brush and Pen have an Opacity property)
  • How to convert your application from TCanvas to CanvasBGRA (video)
• Drawing with a 2D canvas with affine transformations (No. 14)
• Real 3D rendering (No. 15)
• Using textures with 3D rendering (No. 16)

More

You can use BGRABitmap to improve TAChart rendering.

More classes are available (you need to create them when you need them):

• TBGRATextEffect, in unit BGRATextFX, allows to prepare the drawing of text line, to add effects like contour and shadow.
• TBGRALayeredBitmap, in unit BGRALayers, allow to create a multi-layered bitmap. Units BGRAPaintNet and BGRAOpenRaster contain implementations to read and write in Paint.NET format (read only) and OpenRaster format (read and write).
• Units BGRAGradientScanner and BGRATransform contain scanners to do various effects.
• Unit BGRAGradients contain procedures to generate gradients and TPhongShading class for Phong shading.
• TBGRACompressableBitmap, in unit BGRACompressableBitmap, allow to store and compress images.

Other units contient low level functions, and you should not need to use them for a normal usage.