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PathGradientBrush.cs
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PathGradientBrush.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.ComponentModel;
namespace System.Drawing.Drawing2D;
public sealed unsafe class PathGradientBrush : Brush
{
public PathGradientBrush(PointF[] points) : this(points, WrapMode.Clamp) { }
public PathGradientBrush(PointF[] points, WrapMode wrapMode)
{
ArgumentNullException.ThrowIfNull(points);
if (wrapMode is < WrapMode.Tile or > WrapMode.Clamp)
throw new InvalidEnumArgumentException(nameof(wrapMode), (int)wrapMode, typeof(WrapMode));
if (points.Length < 2)
throw new ArgumentException(null, nameof(points));
fixed (PointF* p = points)
{
GpPathGradient* nativeBrush;
PInvoke.GdipCreatePathGradient(
(GdiPlus.PointF*)p,
points.Length,
(GdiPlus.WrapMode)wrapMode,
&nativeBrush).ThrowIfFailed();
SetNativeBrushInternal((GpBrush*)nativeBrush);
}
}
public PathGradientBrush(Point[] points) : this(points, WrapMode.Clamp) { }
public PathGradientBrush(Point[] points, WrapMode wrapMode)
{
ArgumentNullException.ThrowIfNull(points);
if (wrapMode is < WrapMode.Tile or > WrapMode.Clamp)
throw new InvalidEnumArgumentException(nameof(wrapMode), (int)wrapMode, typeof(WrapMode));
if (points.Length < 2)
throw new ArgumentException(null, nameof(points));
fixed (Point* p = points)
{
GpPathGradient* nativeBrush;
PInvoke.GdipCreatePathGradientI(
(GdiPlus.Point*)p,
points.Length,
(GdiPlus.WrapMode)wrapMode,
&nativeBrush).ThrowIfFailed();
SetNativeBrushInternal((GpBrush*)nativeBrush);
}
}
public PathGradientBrush(GraphicsPath path)
{
ArgumentNullException.ThrowIfNull(path);
GpPathGradient* nativeBrush;
PInvoke.GdipCreatePathGradientFromPath(path._nativePath, &nativeBrush).ThrowIfFailed();
SetNativeBrushInternal((GpBrush*)nativeBrush);
}
internal PathGradientBrush(GpPathGradient* nativeBrush)
{
Debug.Assert(nativeBrush is not null, "Initializing native brush with null.");
SetNativeBrushInternal((GpBrush*)nativeBrush);
}
internal GpPathGradient* NativePathGradient => (GpPathGradient*)NativeBrush;
public override object Clone()
{
GpBrush* clonedBrush;
PInvoke.GdipCloneBrush(NativeBrush, &clonedBrush).ThrowIfFailed();
GC.KeepAlive(this);
return new PathGradientBrush((GpPathGradient*)clonedBrush);
}
public Color CenterColor
{
get
{
ARGB argb;
PInvoke.GdipGetPathGradientCenterColor(NativePathGradient, (uint*)&argb).ThrowIfFailed();
GC.KeepAlive(this);
return argb;
}
set
{
PInvoke.GdipSetPathGradientCenterColor(NativePathGradient, (ARGB)value).ThrowIfFailed();
GC.KeepAlive(this);
}
}
public Color[] SurroundColors
{
get
{
int count;
PInvoke.GdipGetPathGradientSurroundColorCount(NativePathGradient, &count).ThrowIfFailed();
using ArgbBuffer buffer = new(count);
fixed (uint* b = buffer)
{
PInvoke.GdipGetPathGradientSurroundColorsWithCount(NativePathGradient, b, &count).ThrowIfFailed();
}
GC.KeepAlive(this);
return buffer.ToColorArray(count);
}
set
{
ArgumentNullException.ThrowIfNull(value);
using ArgbBuffer buffer = new(value);
int count = value.Length;
fixed (uint* b = buffer)
{
PInvoke.GdipSetPathGradientSurroundColorsWithCount(
NativePathGradient,
b,
&count).ThrowIfFailed();
GC.KeepAlive(this);
}
}
}
public PointF CenterPoint
{
get
{
PointF point;
PInvoke.GdipGetPathGradientCenterPoint(NativePathGradient, (GdiPlus.PointF*)&point).ThrowIfFailed();
GC.KeepAlive(this);
return point;
}
set
{
PInvoke.GdipSetPathGradientCenterPoint(NativePathGradient, (GdiPlus.PointF*)&value).ThrowIfFailed();
GC.KeepAlive(this);
}
}
public RectangleF Rectangle
{
get
{
RectangleF rect;
PInvoke.GdipGetPathGradientRect(NativePathGradient, (RectF*)&rect).ThrowIfFailed();
GC.KeepAlive(this);
return rect;
}
}
public Blend Blend
{
get
{
// Figure out the size of blend factor array
int count;
PInvoke.GdipGetPathGradientBlendCount(NativePathGradient, &count).ThrowIfFailed();
float[] factors = new float[count];
float[] positions = new float[count];
// Retrieve horizontal blend factors
fixed (float* f = factors, p = positions)
{
PInvoke.GdipGetPathGradientBlend(NativePathGradient, f, p, count).ThrowIfFailed();
}
// Return the result in a managed array
Blend blend = new(factors.Length)
{
Factors = factors,
Positions = positions
};
GC.KeepAlive(this);
return blend;
}
set
{
ArgumentNullException.ThrowIfNull(value);
ArgumentNullException.ThrowIfNull(value.Factors);
if (value.Positions is null || value.Positions.Length != value.Factors.Length)
throw new ArgumentException(SR.Format(SR.InvalidArgumentValue, "value.Positions", value.Positions), nameof(value));
int count = value.Factors.Length;
fixed (float* f = value.Factors, p = value.Positions)
{
// Set blend factors
PInvoke.GdipSetPathGradientBlend(NativePathGradient, f, p, count).ThrowIfFailed();
GC.KeepAlive(this);
}
}
}
public void SetSigmaBellShape(float focus) => SetSigmaBellShape(focus, (float)1.0);
public void SetSigmaBellShape(float focus, float scale)
{
PInvoke.GdipSetPathGradientSigmaBlend(NativePathGradient, focus, scale).ThrowIfFailed();
GC.KeepAlive(this);
}
public void SetBlendTriangularShape(float focus) => SetBlendTriangularShape(focus, (float)1.0);
public void SetBlendTriangularShape(float focus, float scale)
{
PInvoke.GdipSetPathGradientLinearBlend(NativePathGradient, focus, scale).ThrowIfFailed();
GC.KeepAlive(this);
}
public ColorBlend InterpolationColors
{
get
{
// Figure out the size of blend factor array
int count;
PInvoke.GdipGetPathGradientPresetBlendCount(NativePathGradient, &count).ThrowIfFailed();
if (count == 0)
{
return new ColorBlend();
}
using ArgbBuffer colors = new(count);
float[] positions = new float[count];
ColorBlend blend = new(count);
fixed (uint* c = colors)
fixed (float* p = positions)
{
// Retrieve horizontal blend factors
PInvoke.GdipGetPathGradientPresetBlend(NativePathGradient, c, p, count).ThrowIfFailed();
}
blend.Positions = positions;
blend.Colors = colors.ToColorArray(count);
GC.KeepAlive(this);
return blend;
}
set
{
ArgumentNullException.ThrowIfNull(value);
int count = value.Colors.Length;
if (value.Positions is null || value.Colors.Length != value.Positions.Length)
throw new ArgumentException(SR.Format(SR.InvalidArgumentValue, "value.Positions", value.Positions), nameof(value));
float[] positions = value.Positions;
using ArgbBuffer argbColors = new(value.Colors);
fixed (float* p = positions)
fixed (uint* a = argbColors)
{
// Set blend factors
PInvoke.GdipSetPathGradientPresetBlend(NativePathGradient, a, p, count).ThrowIfFailed();
GC.KeepAlive(this);
}
}
}
public Matrix Transform
{
get
{
Matrix matrix = new();
PInvoke.GdipGetPathGradientTransform(NativePathGradient, matrix.NativeMatrix).ThrowIfFailed();
GC.KeepAlive(this);
return matrix;
}
set
{
ArgumentNullException.ThrowIfNull(value);
PInvoke.GdipSetPathGradientTransform(NativePathGradient, value.NativeMatrix).ThrowIfFailed();
GC.KeepAlive(value);
GC.KeepAlive(this);
}
}
public void ResetTransform()
{
PInvoke.GdipResetPathGradientTransform(NativePathGradient).ThrowIfFailed();
GC.KeepAlive(this);
}
public void MultiplyTransform(Matrix matrix) => MultiplyTransform(matrix, MatrixOrder.Prepend);
public void MultiplyTransform(Matrix matrix, MatrixOrder order)
{
ArgumentNullException.ThrowIfNull(matrix);
PInvoke.GdipMultiplyPathGradientTransform(
NativePathGradient,
matrix.NativeMatrix,
(GdiPlus.MatrixOrder)order).ThrowIfFailed();
GC.KeepAlive(matrix);
GC.KeepAlive(this);
}
public void TranslateTransform(float dx, float dy) => TranslateTransform(dx, dy, MatrixOrder.Prepend);
public void TranslateTransform(float dx, float dy, MatrixOrder order)
{
PInvoke.GdipTranslatePathGradientTransform(NativePathGradient, dx, dy, (GdiPlus.MatrixOrder)order).ThrowIfFailed();
GC.KeepAlive(this);
}
public void ScaleTransform(float sx, float sy) => ScaleTransform(sx, sy, MatrixOrder.Prepend);
public void ScaleTransform(float sx, float sy, MatrixOrder order)
{
PInvoke.GdipScalePathGradientTransform(NativePathGradient, sx, sy, (GdiPlus.MatrixOrder)order).ThrowIfFailed();
GC.KeepAlive(this);
}
public void RotateTransform(float angle) => RotateTransform(angle, MatrixOrder.Prepend);
public void RotateTransform(float angle, MatrixOrder order)
{
PInvoke.GdipRotatePathGradientTransform(NativePathGradient, angle, (GdiPlus.MatrixOrder)order).ThrowIfFailed();
GC.KeepAlive(this);
}
public PointF FocusScales
{
get
{
float scaleX;
float scaleY;
PInvoke.GdipGetPathGradientFocusScales(NativePathGradient, &scaleX, &scaleY).ThrowIfFailed();
GC.KeepAlive(this);
return new PointF(scaleX, scaleY);
}
set
{
PInvoke.GdipSetPathGradientFocusScales(NativePathGradient, value.X, value.Y).ThrowIfFailed();
GC.KeepAlive(this);
}
}
public WrapMode WrapMode
{
get
{
WrapMode mode;
PInvoke.GdipGetPathGradientWrapMode(NativePathGradient, (GdiPlus.WrapMode*)&mode).ThrowIfFailed();
GC.KeepAlive(this);
return mode;
}
set
{
if (value is < WrapMode.Tile or > WrapMode.Clamp)
throw new InvalidEnumArgumentException(nameof(value), (int)value, typeof(WrapMode));
PInvoke.GdipSetPathGradientWrapMode(NativePathGradient, (GdiPlus.WrapMode)value).ThrowIfFailed();
GC.KeepAlive(this);
}
}
}