Control RectangleClip()
{
var control = new Drawable { Size = new Size(300, 100) };
control.Paint += (sender, e) =>
{
e.Graphics.SetClip(new RectangleF(25, 25, 50, 50));
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Blue, new RectangleF(25, 0, 100, 100));
e.Graphics.SetClip(new RectangleF(125, 25, 50, 50));
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Red, new RectangleF(125, 0, 100, 100));
e.Graphics.SetClip(new RectangleF(225, 25, 50, 50));
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Green, new RectangleF(225, 0, 100, 100));
};
PropertyChanged += (sender, e) =>
{
if (e.PropertyName == "ResetClip")
control.Invalidate();
};
return control;
}
Control ClearGraphicsTest()
{
var control = new Drawable
{
Size = new Size(200, 200),
BackgroundColor = Colors.Yellow
};
control.Paint += (sender, e) => DrawSample(e.Graphics);
PropertyChanged += (sender, e) => control.Invalidate();
return control;
}
public UnitTestSection()
{
var layout = new DynamicLayout();
var button = new Button { Text = "Start Tests" };
var drawable = new Drawable();
layout.BeginVertical(xscale: true);
layout.Add(drawable, yscale: true);
layout.Add(button);
layout.EndVertical();
Content = layout;
// Run the tests in a Paint callback
var startTests = false;
button.Click += (s, e) => {
startTests = true;
drawable.Invalidate();
};
drawable.Paint += (s, e) => {
if (startTests)
{
startTests = false;
button.Enabled = false;
// run the tests
try
{
new TestRunner().RunTests<DrawingTests>(() => new DrawingTests
{
Drawable = drawable,
Graphics = e.Graphics
});
}
finally
{
button.Enabled = true;
}
}
};
}
public TextureBrushesSection2()
{
var w = image.Size.Width / 3; // same as height
var img = image.Clone(new Rectangle(w, w, w, w));
var brush = new TextureBrush(img);
var drawable = new Drawable();
var font = new Font(SystemFont.Default);
this.Content = drawable;
var location = new PointF(100, 100);
drawable.BackgroundColor = Colors.Green;
drawable.MouseMove += (s, e) => {
location = e.Location;
drawable.Invalidate(); };
drawable.Paint += (s, e) => {
e.Graphics.DrawText(font, Colors.White, 3, 3, "Move the mouse in this area to move the image.");
var temp = brush.Transform; // save state
brush.Transform = Matrix.FromTranslation(location);
e.Graphics.FillRectangle(brush, new RectangleF(location, img.Size));
brush.Transform = temp;
};
}
Control PathClip()
{
var control = new Drawable { Size = new Size(350, 250) };
control.Paint += (sender, e) =>
{
var path = new GraphicsPath();
path.AddEllipse(25, 25, 50, 50);
path.AddRectangle(125, 25, 50, 50);
path.AddLines(new PointF(225, 25), new PointF(225, 75), new PointF(275, 50));
path.CloseFigure();
e.Graphics.SetClip(path);
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Blue, path.Bounds);
path.Transform(Matrix.FromTranslation(0, 75));
e.Graphics.SetClip(path);
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Red, path.Bounds);
path.Transform(Matrix.FromTranslation(0, 75));
e.Graphics.SetClip(path);
if (ResetClip)
e.Graphics.ResetClip();
e.Graphics.FillRectangle(Brushes.Green, path.Bounds);
};
PropertyChanged += (sender, e) =>
{
if (e.PropertyName == "ResetClip")
control.Invalidate();
};
return control;
}
public ClipTransformSection()
{
Padding = new Padding(10);
var drawable = new Drawable();
bool showInvalid = false;
var showInvalidCheckBox = new CheckBox { Text = "Show Invalid Regions" };
showInvalidCheckBox.CheckedBinding.Bind(() => showInvalid, v => { showInvalid = v ?? false; drawable.Invalidate(); });
drawable.Paint += (sender, e) =>
{
var g = e.Graphics;
var rect = new RectangleF(drawable.ClientSize);
Func<RectangleF> boundsRect = () => g.CurrentTransform.Inverse().TransformRectangle(rect);
g.SaveTransform();
g.SetClip(new RectangleF(0, 0, 50, 50));
g.FillRectangle(Colors.Red, rect);
g.TranslateTransform(50, 0);
if (!showInvalid)
g.FillRectangle(Colors.Green, boundsRect());
g.TranslateTransform(0, 50);
g.SetClip(new RectangleF(0, 0, 50, 50));
g.FillRectangle(Colors.Red, boundsRect());
g.ScaleTransform(2, 2);
g.TranslateTransform(25, 25);
if (!showInvalid)
g.FillRectangle(Colors.Green, boundsRect());
g.SetClip(GraphicsPath.GetRoundRect(new RectangleF(0, 0, 25, 25), 4));
g.FillRectangle(Colors.Red, boundsRect());
g.ScaleTransform(2, 2);
g.TranslateTransform(25, 25);
if (!showInvalid)
g.FillRectangle(Colors.Green, boundsRect());
g.SetClip(new RectangleF(-25/2f, -25/2f, 25/2f, 25/2f));
g.FillRectangle(Colors.Red, boundsRect());
g.RestoreTransform();
if (!showInvalid)
g.FillRectangle(Colors.Green, boundsRect());
};
var options = new StackLayout
{
Orientation = Orientation.Horizontal,
VerticalContentAlignment = VerticalAlignment.Center,
Spacing = 5,
Items = { showInvalidCheckBox }
};
Content = new StackLayout {
Spacing = 5,
HorizontalContentAlignment = HorizontalAlignment.Stretch,
Items = { options, new StackLayoutItem(drawable, expand: true) }
};
}