12.旋转、缩放、倾斜、平移Transform
RotateTransform旋转RotateTransform表示旋转一个对象的角度。首先我们来看一下它的定义
public sealed class RotateTransform : Transform
{
public static readonly DependencyProperty AngleProperty;
public static readonly DependencyProperty CenterXProperty;
public static readonly DependencyProperty CenterYProperty;
public RotateTransform();
public RotateTransform(double angle);
public RotateTransform(double angle, double centerX, double centerY);
public double Angle { get; set; }
public double CenterX { get; set; }
public double CenterY { get; set; }
public override Matrix Value { get; }
public RotateTransform Clone();
public RotateTransform CloneCurrentValue();
protected override Freezable CreateInstanceCore();
}Angle属性表示获取或设置顺时针旋转的角度（以度为单位）。默认值是0度。
CenterX 和CenterY 表示获取或设置旋转中心点的 x y坐标，Value属性表示当前转换的矩阵。
通常我们只需要设置Angle、CenterX 和CenterY即可
案列：
<Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" />
ScaleTransform缩放
ScaleTransform表示在二维xy坐标系内缩放对象。所以它放大缩小的方向只有两个，分别是X方向和Y方向。另外，每个方向上需要设置一个中心点。
public sealed class ScaleTransform : Transform
{
public static readonly DependencyProperty ScaleXProperty;
public static readonly DependencyProperty ScaleYProperty;
public static readonly DependencyProperty CenterXProperty;
public static readonly DependencyProperty CenterYProperty;
public ScaleTransform();
public ScaleTransform(double scaleX, double scaleY);
public ScaleTransform(double scaleX, double scaleY, double centerX, double centerY);
public double ScaleX { get; set; }
public double ScaleY { get; set; }
public double CenterX { get; set; }
public double CenterY { get; set; }
public override Matrix Value { get; }
public ScaleTransform Clone();
public ScaleTransform CloneCurrentValue();
protected override Freezable CreateInstanceCore();
}ScaleX属性：获取或设置X轴缩放比例。
ScaleY属性：获取或设置Y轴缩放比例。
CenterX属性：获取或设置当前缩放对象的X轴的中心坐标。
CenterY属性：获取或设置当前缩放对象的Y轴的中心坐标。
案例：
<Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" /> <Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" />
SkewTransform倾斜
SkewTransform表示倾斜某个对象，它有两个方向的倾斜角度可以设置，AngleX表示设置x 轴倾斜角度，该角度是从 y 轴逆时针旋转后测量得到，单位为度。AngleY表示设置y 轴倾斜角度，该角度通过测量从 x 轴逆时针旋转得到的角度度数。另外，它也有CenterX和CenterY，表示倾斜转换中心的xy坐标。
public sealed class SkewTransform : Transform
{
public static readonly DependencyProperty AngleXProperty;
public static readonly DependencyProperty AngleYProperty;
public static readonly DependencyProperty CenterXProperty;
public static readonly DependencyProperty CenterYProperty;
public SkewTransform();
public SkewTransform(double angleX, double angleY);
public SkewTransform(double angleX, double angleY, double centerX, double centerY);
public double AngleX { get; set; }
public double AngleY { get; set; }
public double CenterX { get; set; }
public double CenterY { get; set; }
public override Matrix Value { get; }
public SkewTransform Clone();
public SkewTransform CloneCurrentValue();
}案例：
<Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" /> <Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" />
TranslateTransform平移
TranslateTransform只有X和Y两个属性，分别代表X轴和Y轴上的平移距离。
public sealed class TranslateTransform : Transform
{
public static readonly DependencyProperty XProperty;
public static readonly DependencyProperty YProperty;
public TranslateTransform();
public TranslateTransform(double offsetX, double offsetY);
public double X { get; set; }
public double Y { get; set; }
public override Matrix Value { get; }
public TranslateTransform Clone();
public TranslateTransform CloneCurrentValue();
}
案例：
<Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" /> <Button Grid.Column="1"
Width="100"
Height="25"
Content="RotateTransform"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Button.<strong>RenderTransform</strong>>
<<strong>RotateTransform Angle</strong>="{Binding ElementName=slider,Path=Value}"<strong>
CenterX</strong>="50" <strong>CenterY</strong>="12.5"/>
</Button.RenderTransform>
</Button>
<Slider x:Name="slider"
Grid.ColumnSpan="3"
Margin="30"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Value="0"
Maximum="720"
Width="400" /> 在这个例子中，左边的border的TranslateTransform 对象的值直接绑定到slider，拖动两个slider就可以控制border水平和垂直方向的位置。右边的border则利用鼠标按下、移动和抬起事件，初步实现了用鼠标去移动位置的功能
public partial class MainWindow : Window
{
public Point DownPoint { get; private set; } = new Point(0, 0);
public bool IsMouseDown { get; private set; } = false;
public MainWindow()
{
InitializeComponent();
}
private void Window_MouseMove(object sender, MouseEventArgs e)
{
if (!IsMouseDown) return;
if (border.RenderTransform is TranslateTransform t)
{
Point point = e.GetPosition(this);
t.X = (point.X - DownPoint.X);
t.Y = (point.Y - DownPoint.Y);
}
}
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
IsMouseDown = true;
DownPoint = e.GetPosition(this);
}
private void Window_MouseUp(object sender, MouseButtonEventArgs e)
{
IsMouseDown = false;
}
}
来源:https://www.cnblogs.com/MingQiu/p/18000496
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