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graphics-and-animations.md

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Graphics & Animations

Graphics

Avalonia introduces an extensive, scalable, and flexible set of graphics features that have the following benefits:

  • Resolution-independent and device-independent graphics. The basic unit of measurement in the Avalonia graphics system is the device-independent pixel, which is 1/96th of an inch, regardless of actual screen resolution, and provides the foundation for resolution-independent and device-independent rendering. Each device-independent pixel automatically scales to match the dots-per-inch (dpi) setting of the system it renders on.
  • Improved precision. The Avalonia coordinate system is measured with double-precision floating-point numbers rather than single-precision. Transformations and opacity values are also expressed as double-precision.
  • Advanced graphics and animation support. Avalonia simplifies graphics programming by managing animation scenes for you; there is no need to worry about scene processing, rendering loops, and bilinear interpolation. Additionally, Avalonia provides hit-testing support and full alpha-compositing support.
  • Skia. By default Avalonia uses the Skia rendering engine, the same rendering engine that powers Google Chrome and Chrome OS, Android, Mozilla Firefox and Firefox OS, and many other products.

2D Shapes and Geometries

Avalonia provides a library of common vector-drawn 2D shapes such as Ellipse, Line, Path, Polygon and Rectangle.

<Canvas Background="Yellow" Width="300" Height="400">
    <Rectangle Fill="Blue" Width="63" Height="41" Canvas.Left="40" Canvas.Top="31">
    <Rectangle.OpacityMask>
        <LinearGradientBrush StartPoint="0%,0%" EndPoint="100%,100%">
        <LinearGradientBrush.GradientStops>
            <GradientStop Offset="0" Color="Black"/>
            <GradientStop Offset="1" Color="Transparent"/>
        </LinearGradientBrush.GradientStops>
        </LinearGradientBrush>
    </Rectangle.OpacityMask>     
    </Rectangle>
    <Ellipse Fill="Green" Width="58" Height="58" Canvas.Left="88" Canvas.Top="100"/>
    <Path Fill="Orange" Data="M 0,0 c 0,0 50,0 50,-50 c 0,0 50,0 50,50 h -50 v 50 l -50,-50 Z" Canvas.Left="30" Canvas.Top="250"/>
    <Path Fill="OrangeRed" Canvas.Left="180" Canvas.Top="250">
    <Path.Data>
        <PathGeometry>
        <PathFigure StartPoint="0,0" IsClosed="True">
            <QuadraticBezierSegment Point1="50,0" Point2="50,-50" />
            <QuadraticBezierSegment Point1="100,-50" Point2="100,0" />
            <LineSegment Point="50,0" />
            <LineSegment Point="50,50" />
        </PathFigure>
        </PathGeometry>
    </Path.Data>
    </Path>
    <Line StartPoint="120,185" EndPoint="30,115" Stroke="Red" StrokeThickness="2"/>
    <Polygon Points="75,0 120,120 0,45 150,45 30,120" Stroke="DarkBlue" StrokeThickness="1" Fill="Violet" Canvas.Left="150" Canvas.Top="31"/>
    <Polyline Points="0,0 65,0 78,-26 91,39 104,-39 117,13 130,0 195,0" Stroke="Brown" Canvas.Left="30" Canvas.Top="350"/>
</Canvas>

Drawing shapes

Animation

Avalonia's animation support lets you make controls grow, shake, spin, and fade, to create interesting page transitions, and more. Avalonia uses a CSS-like animation system which supports property transitions and keyframe animations.