Graphics32

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Tutorials ​

Welcome to the Graphics32 Tutorials section! Whether you are completely new to Graphics32 or looking for practical code snippets to perform common graphics tasks, these beginner-friendly guides provide step-by-step explanations and Pascal code snippets to introduce you to the most common usage patterns.

Tutorial Guides ​

  1. Basic Drawing & Shapes Learn how to instantiate TBitmap32, clear backgrounds, set bitmap dimensions, draw primitive lines and rectangles, and understand clipping method suffixes (*S, *TS).

  2. Alpha Blending & Transparency Explore 32-bit ARGB colors (TColor32), translucent color constants, DrawMode settings (dmOpaque, dmBlend), combine modes (cmAdd, cmModulate), and global MasterAlpha controls.

  3. Fast Pixel Access & Direct Manipulation Master high-performance pixel operations using bounds-checked PixelS, unchecked Pixel, row pointers via ScanLine[Y], and whole-image flat array processing with Bits.

  4. Image Resampling & High-Quality Scaling Understand nearest-neighbor stretching vs convolution resampling, configuring TKernelResampler, choosing optimal filter kernels (Lanczos, Mitchell, Bicubic), and using procedural Resample helpers.

  5. Affine Transformations Learn how TAffineTransformation matrices work to rotate bitmaps around custom center points, scale, skew, and translate surfaces, and calculate exact transformed bounding boxes with GetTransformedBounds.

  6. Vector Polygons & Path Drawing Discover sub-pixel float coordinates (TFloatPoint), anti-aliased polygon rendering with VPR (PolygonFS), stroking thick paths with customizable line joins and caps, and multi-contour hole filling.

  7. Color Gradients & Fill Samplers Configure gradient color stops with TColor32Gradient, fill vector polygons with TLinearGradientPolygonFiller and TRadialGradientPolygonFiller, and control gradient repetitions with WrapMode.

  8. Working with Interactive Layers in TImage32 Build interactive desktop applications using TImage32, add positionable TBitmapLayer instances, enable interactive mouse dragging and resizing handles with TRubberbandLayer, and manage z-order.

  9. Loading, Saving & Image Formats Load and save 32-bit images across PNG, JPEG, BMP, and PSD formats from disk and memory streams, preserve alpha channels with ResetAlpha, and convert pixels between VCL/FCL TBitmap and TBitmap32.

  10. Repaint Optimization & Custom Canvas Drawing Optimize rendering performance with BeginUpdate/EndUpdate batching, invalidate partial sub-regions using Changed(TRect), draw non-destructive UI overlays with TImage32.OnPaintStage, and build smooth animation loops.