public ColorChangeableCanvas()
{
this.InitializeComponent();
var watcher = new DependencyPropertyWatcher <Brush>(this, "Foreground");
watcher.PropertyChanged += (s, e) =>
{
if (s is DependencyPropertyWatcher <Brush> w)
{
ForegroundPropertyChanged(w.Value);
}
};
win2DCanvas.CreateResources += (s, e) =>
{
// s is CanvasControl
// e is CanvasCreateResourcesEventArgs
e.TrackAsyncAction(CreateResourcesAsync(s).AsAsyncAction());
};
win2DCanvas.Draw += (s, e) =>
{
// s is CanvasControl
// e is CanvasDrawEventArgs
if (_bitmap is null)
{
return;
}
if (IsLoadInProgress())
{
return;
}
// ビットマップにエフェクトを掛ける
Color c = _foreground; //colorPicker.Color;
float r = c.R / 255.0f;
float g = c.G / 255.0f;
float b = c.B / 255.0f;
var colorMatrixEffect = new ColorMatrixEffect
{
Source = _bitmap,
ColorMatrix = new Matrix5x4
{
M11 = r, M12 = 0, M13 = 0, M14 = 0,
M21 = 0, M22 = g, M23 = 0, M24 = 0,
M31 = 0, M32 = 0, M33 = b, M34 = 0,
M41 = 0, M42 = 0, M43 = 0, M44 = 1,
M51 = 0, M52 = 0, M53 = 0, M54 = 0
},
};
// エフェクトを掛けた結果を表示する
e.DrawingSession.DrawImage(colorMatrixEffect, 0, 0);
// ※ ここでは、Win2D Canvas を UserControl の中に入れているため、表示サイズの調整が必要。
this.Width = _bitmap.Size.Width;
this.Height = _bitmap.Size.Height;
};
}
public static void OnPropertyChanged(object sender, DependencyPropertyChangedEventArgs args)
{
DependencyPropertyWatcher <T> source = (DependencyPropertyWatcher <T>)sender;
source.PropertyChanged?.Invoke(source, EventArgs.Empty);
}