/// <summary>
/// Renders the specified visual.
/// </summary>
/// <param name="visual">The visual to render.</param>
/// <param name="context">The drawing context.</param>
private void Render(IVisual visual, DrawingContext context)
{
if (visual.IsVisible && visual.Opacity > 0)
{
Matrix transform = Matrix.Identity;
if (visual.RenderTransform != null)
{
Matrix current = context.CurrentTransform;
Matrix offset = Matrix.Translation(visual.TransformOrigin.ToPixels(visual.Bounds.Size));
transform = -current * -offset * visual.RenderTransform.Value * offset * current;
}
transform *= Matrix.Translation(visual.Bounds.Position);
using (visual.ClipToBounds ? context.PushClip(visual.Bounds) : null)
using (context.PushTransform(transform))
{
visual.Render(context);
foreach (var child in visual.VisualChildren)
{
this.Render(child, context);
}
}
}
}
/// <summary>
/// Renders the specified visual.
/// </summary>
/// <param name="visual">The visual to render.</param>
/// <param name="context">The drawing context.</param>
private void Render(IVisual visual, DrawingContext context, Matrix translation, Matrix transform)
{
if (visual.IsVisible && visual.Opacity > 0)
{
// Translate any existing transform into this controls coordinate system.
Matrix offset = Matrix.Translation(visual.Bounds.Position);
transform = offset * transform * -offset;
// Update the current offset.
translation *= Matrix.Translation(visual.Bounds.Position);
// Apply the control's render transform, if any.
if (visual.RenderTransform != null)
{
offset = Matrix.Translation(visual.TransformOrigin.ToPixels(visual.Bounds.Size));
transform *= -offset * visual.RenderTransform.Value * offset;
}
// Draw the control and its children.
var m = transform * translation;
var d = context.PushTransform(m);
using (visual.ClipToBounds ? context.PushClip(visual.Bounds) : null)
{
visual.Render(context);
d.Dispose();
foreach (var child in visual.VisualChildren)
{
this.Render(child, context, translation, transform);
}
}
}
}
/// <summary>
/// Converts a <see cref="Matrix"/> to a Direct2D <see cref="Matrix3x2"/>
/// </summary>
/// <param name="matrix">The <see cref="Matrix"/>.</param>
/// <returns>The <see cref="Matrix3x2"/>.</returns>
private Matrix3x2 Convert(Matrix matrix)
{
return(new Matrix3x2(
(float)matrix.M11,
(float)matrix.M12,
(float)matrix.M21,
(float)matrix.M22,
(float)matrix.OffsetX,
(float)matrix.OffsetY));
}
/// <summary>
/// Converts a Perspex <see cref="Perspex.Matrix"/> to a Direct2D <see cref="Matrix3x2"/>
/// </summary>
/// <param name="matrix">The <see cref="Matrix"/>.</param>
/// <returns>The <see cref="Matrix3x2"/>.</returns>
public static Matrix3x2 ToDirect2D(this Perspex.Matrix matrix)
{
return(new Matrix3x2(
(float)matrix.M11,
(float)matrix.M12,
(float)matrix.M21,
(float)matrix.M22,
(float)matrix.OffsetX,
(float)matrix.OffsetY));
}
/// <summary>
/// Pushes a matrix transformation.
/// </summary>
/// <param name="matrix">The matrix</param>
/// <returns>A disposable used to undo the transformation.</returns>
public IDisposable PushTransform(Matrix matrix)
{
Matrix3x2 m3x2 = matrix.ToDirect2D();
Matrix3x2 transform = this.renderTarget.Transform * m3x2;
this.renderTarget.Transform = transform;
return(Disposable.Create(() =>
{
m3x2.Invert();
this.renderTarget.Transform = transform * m3x2;
}));
}
/// <summary>
/// Pushes a matrix transformation.
/// </summary>
/// <param name="matrix">The matrix</param>
/// <returns>A disposable used to undo the transformation.</returns>
public IDisposable PushTransform(Matrix matrix)
{
Matrix3x2 m3x2 = matrix.ToDirect2D();
Matrix3x2 transform = this.renderTarget.Transform * m3x2;
this.renderTarget.Transform = transform;
return Disposable.Create(() =>
{
m3x2.Invert();
this.renderTarget.Transform = transform * m3x2;
});
}
