Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Advanced / PathGradientBrush.cs / 1305376 / PathGradientBrush.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Drawing.Drawing2D {
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Drawing;
using System.ComponentModel;
using Microsoft.Win32;
using System.Drawing.Internal;
using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.Versioning;
/**
* Represent a PathGradient brush object
*/
///
/// Encapsulates a
public sealed class PathGradientBrush : Brush {
/**
* Create a new rectangle gradient brush object
*/
///
///
/// Initializes a new instance of the
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public PathGradientBrush(PointF[] points)
: this(points, System.Drawing.Drawing2D.WrapMode.Clamp) {
}
///
/// Initializes a new instance of the
[SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")]
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public PathGradientBrush(PointF[] points, WrapMode wrapMode)
{
if (points == null)
throw new ArgumentNullException("points");
//validate the WrapMode enum
//valid values are 0x0 to 0x4
if (!ClientUtils.IsEnumValid(wrapMode, (int)wrapMode, (int)WrapMode.Tile, (int)WrapMode.Clamp))
{
throw new InvalidEnumArgumentException("wrapMode", (int)wrapMode, typeof(WrapMode));
}
IntPtr brush = IntPtr.Zero;
IntPtr pointsBuf = SafeNativeMethods.Gdip.ConvertPointToMemory(points);
try
{
int status = SafeNativeMethods.Gdip.GdipCreatePathGradient(new HandleRef(null, pointsBuf),
points.Length,
(int)wrapMode,
out brush);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
SetNativeBrushInternal(brush);
}
finally
{
// Inside SafeNativeMethods.Gdip.ConvertPointToMemory, Marshal.AllocHGlobal
// is used to allocate unmanaged memory. Therefore, we need to free it
// manually with Marshal.FreeHGlobal
if (pointsBuf != IntPtr.Zero)
{
Marshal.FreeHGlobal(pointsBuf);
}
}
}
///
///
/// Initializes a new instance of the
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public PathGradientBrush(Point[] points)
: this(points, System.Drawing.Drawing2D.WrapMode.Clamp) {
}
///
///
/// Initializes a new instance of the
///
[SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")]
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public PathGradientBrush(Point[] points, WrapMode wrapMode)
{
if (points == null)
throw new ArgumentNullException("points");
//validate the WrapMode enum
if (!ClientUtils.IsEnumValid(wrapMode, (int)wrapMode, (int)WrapMode.Tile, (int)WrapMode.Clamp))
{
throw new InvalidEnumArgumentException("wrapMode", (int)wrapMode, typeof(WrapMode));
}
IntPtr brush = IntPtr.Zero;
IntPtr pointsBuf = SafeNativeMethods.Gdip.ConvertPointToMemory(points);
try
{
int status = SafeNativeMethods.Gdip.GdipCreatePathGradientI(new HandleRef(null, pointsBuf),
points.Length,
(int)wrapMode,
out brush);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
SetNativeBrushInternal(brush);
}
finally
{
// Inside SafeNativeMethods.Gdip.ConvertPointToMemory, Marshal.AllocHGlobal
// is used to allocate unmanaged memory. Therefore, we need to free it
// manually with Marshal.FreeHGlobal
if (pointsBuf != IntPtr.Zero)
{
Marshal.FreeHGlobal(pointsBuf);
}
}
}
///
///
/// Initializes a new instance of the
///
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public PathGradientBrush(GraphicsPath path)
{
if (path == null)
throw new ArgumentNullException("path");
IntPtr brush = IntPtr.Zero;
int status = SafeNativeMethods.Gdip.GdipCreatePathGradientFromPath(new HandleRef(path, path.nativePath),
out brush);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
SetNativeBrushInternal(brush);
}
///
/// Constructor to initialized this object to be owned by GDI+.
///
internal PathGradientBrush(IntPtr nativeBrush )
{
Debug.Assert( nativeBrush != IntPtr.Zero, "Initializing native brush with null." );
SetNativeBrushInternal( nativeBrush );
}
///
/// Creates an exact copy of this
[ResourceExposure(ResourceScope.Process)]
[ResourceConsumption(ResourceScope.Process)]
public override object Clone() {
IntPtr cloneBrush = IntPtr.Zero;
int status = SafeNativeMethods.Gdip.GdipCloneBrush(new HandleRef(this, this.NativeBrush), out cloneBrush);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return new PathGradientBrush(cloneBrush );
}
/**
* Set/get center color attributes
*/
///
/// Gets or sets the color at the center of the
/// path gradient.
///
public Color CenterColor
{
get {
int argb;
int status = SafeNativeMethods.Gdip.GdipGetPathGradientCenterColor(new HandleRef(this, this.NativeBrush), out argb);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return Color.FromArgb(argb);
}
set {
int status = SafeNativeMethods.Gdip.GdipSetPathGradientCenterColor(new HandleRef(this, this.NativeBrush), value.ToArgb());
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
}
/**
* Get/set colors
* !! NOTE: We do not have methods for GetSurroundColor or SetSurroundColor,
* May need to add usage of Collection class
*/
private void _SetSurroundColors(Color[] colors)
{
int count;
int status = SafeNativeMethods.Gdip.GdipGetPathGradientSurroundColorCount(new HandleRef(this, this.NativeBrush),
out count);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
if ((colors.Length > count) || (count <= 0))
throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter);
count = colors.Length;
int[] argbs = new int[count];
for (int i=0; i
///
/// Gets or sets an array of colors that
/// correspond to the points in the path this
///
public Color[] SurroundColors
{
get { return _GetSurroundColors();}
set { _SetSurroundColors(value);}
}
/**
* Set/get center point
*/
///
///
/// Gets or sets the center point of the path
/// gradient.
///
///
public PointF CenterPoint
{
get {
GPPOINTF point = new GPPOINTF();
int status = SafeNativeMethods.Gdip.GdipGetPathGradientCenterPoint(new HandleRef(this, this.NativeBrush), point);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return point.ToPoint();
}
set {
int status = SafeNativeMethods.Gdip.GdipSetPathGradientCenterPoint(new HandleRef(this, this.NativeBrush), new GPPOINTF(value));
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
}
/**
* Get source rectangle
*/
private RectangleF _GetRectangle() {
GPRECTF rect = new GPRECTF();
int status = SafeNativeMethods.Gdip.GdipGetPathGradientRect(new HandleRef(this, this.NativeBrush), ref rect);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return rect.ToRectangleF();
}
///
///
/// Gets a bounding rectangle for this
///
public RectangleF Rectangle
{
get { return _GetRectangle();}
}
/**
* Set/get blend factors
*/
private Blend _GetBlend() {
Blend blend;
// Figure out the size of blend factor array
int retval = 0;
int status = SafeNativeMethods.Gdip.GdipGetPathGradientBlendCount(new HandleRef(this, this.NativeBrush), out retval);
if (status != SafeNativeMethods.Gdip.Ok) {
throw SafeNativeMethods.Gdip.StatusException(status);
}
// Allocate temporary native memory buffer
int count = retval;
IntPtr factors = IntPtr.Zero;
IntPtr positions = IntPtr.Zero;
try {
factors = Marshal.AllocHGlobal(4*count);
positions = Marshal.AllocHGlobal(4*count);
// Retrieve horizontal blend factors
status = SafeNativeMethods.Gdip.GdipGetPathGradientBlend(new HandleRef(this, this.NativeBrush), factors, positions, count);
if (status != SafeNativeMethods.Gdip.Ok) {
throw SafeNativeMethods.Gdip.StatusException(status);
}
// Return the result in a managed array
blend = new Blend(count);
Marshal.Copy(factors, blend.Factors, 0, count);
Marshal.Copy(positions, blend.Positions, 0, count);
}
finally {
if( factors != IntPtr.Zero ) {
Marshal.FreeHGlobal(factors);
}
if( positions != IntPtr.Zero ) {
Marshal.FreeHGlobal(positions);
}
}
return blend;
}
private void _SetBlend(Blend blend) {
// Allocate temporary native memory buffer
// and copy input blend factors into it.
int count = blend.Factors.Length;
IntPtr factors = IntPtr.Zero;
IntPtr positions = IntPtr.Zero;
try {
factors = Marshal.AllocHGlobal(4*count);
positions = Marshal.AllocHGlobal(4*count);
Marshal.Copy(blend.Factors, 0, factors, count);
Marshal.Copy(blend.Positions, 0, positions, count);
// Set blend factors
int status = SafeNativeMethods.Gdip.GdipSetPathGradientBlend(new HandleRef(this, this.NativeBrush), new HandleRef(null, factors), new HandleRef(null, positions), count);
if (status != SafeNativeMethods.Gdip.Ok) {
throw SafeNativeMethods.Gdip.StatusException(status);
}
}
finally {
if( factors != IntPtr.Zero ) {
Marshal.FreeHGlobal(factors);
}
if( positions != IntPtr.Zero ) {
Marshal.FreeHGlobal(positions);
}
}
}
///
///
/// Gets or sets a
///
public Blend Blend
{
get { return _GetBlend();}
set { _SetBlend(value);}
}
/*
* SigmaBlend & LinearBlend
*/
///
///
/// Creates a gradient falloff based on a bell-shaped curve.
///
///
public void SetSigmaBellShape(float focus)
{
SetSigmaBellShape(focus, (float)1.0);
}
///
///
/// Creates a gradient falloff based on a bell-shaped curve.
///
///
public void SetSigmaBellShape(float focus, float scale)
{
int status = SafeNativeMethods.Gdip.GdipSetPathGradientSigmaBlend(new HandleRef(this, this.NativeBrush), focus, scale);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
///
///
/// Creates a triangular gradient.
///
///
public void SetBlendTriangularShape(float focus)
{
SetBlendTriangularShape(focus, (float)1.0);
}
///
///
/// Creates a triangular gradient.
///
///
public void SetBlendTriangularShape(float focus, float scale)
{
int status = SafeNativeMethods.Gdip.GdipSetPathGradientLinearBlend(new HandleRef(this, this.NativeBrush), focus, scale);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
/*
* Preset Color Blend
*/
private ColorBlend _GetInterpolationColors() {
ColorBlend blend;
// Figure out the size of blend factor array
int retval = 0;
int status = SafeNativeMethods.Gdip.GdipGetPathGradientPresetBlendCount(new HandleRef(this, this.NativeBrush), out retval);
if (status != SafeNativeMethods.Gdip.Ok) {
throw SafeNativeMethods.Gdip.StatusException(status);
}
// If retVal is 0, then there is nothing to marshal.
// In this case, we'll return an empty ColorBlend...
//
if (retval == 0) {
return new ColorBlend();
}
// Allocate temporary native memory buffer
int count = retval;
IntPtr colors = IntPtr.Zero;
IntPtr positions = IntPtr.Zero;
try {
colors = Marshal.AllocHGlobal(4*count);
positions = Marshal.AllocHGlobal(4*count);
// Retrieve horizontal blend factors
status = SafeNativeMethods.Gdip.GdipGetPathGradientPresetBlend(new HandleRef(this, this.NativeBrush), colors, positions, count);
if (status != SafeNativeMethods.Gdip.Ok) {
throw SafeNativeMethods.Gdip.StatusException(status);
}
// Return the result in a managed array
blend = new ColorBlend(count);
int[] argb = new int[count];
Marshal.Copy(colors, argb, 0, count);
Marshal.Copy(positions, blend.Positions, 0, count);
// copy ARGB values into Color array of ColorBlend
blend.Colors = new Color[argb.Length];
for (int i=0; i
///
/// Gets or sets a
///
public ColorBlend InterpolationColors
{
get { return _GetInterpolationColors(); }
set { _SetInterpolationColors(value); }
}
/**
* Set/get brush transform
*/
private void _SetTransform(Matrix matrix) {
if (matrix == null)
throw new ArgumentNullException("matrix");
int status = SafeNativeMethods.Gdip.GdipSetPathGradientTransform(new HandleRef(this, this.NativeBrush), new HandleRef(matrix, matrix.nativeMatrix));
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
private Matrix _GetTransform() {
Matrix matrix = new Matrix();
int status = SafeNativeMethods.Gdip.GdipGetPathGradientTransform(new HandleRef(this, this.NativeBrush), new HandleRef(matrix, matrix.nativeMatrix));
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return matrix;
}
///
///
/// Gets or sets a
///
public Matrix Transform
{
get { return _GetTransform();}
set { _SetTransform(value);}
}
///
///
/// Resets the
///
public void ResetTransform() {
int status = SafeNativeMethods.Gdip.GdipResetPathGradientTransform(new HandleRef(this, this.NativeBrush));
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
///
///
/// Multiplies the
///
public void MultiplyTransform(Matrix matrix)
{
MultiplyTransform(matrix, MatrixOrder.Prepend);
}
///
///
/// Multiplies the
///
public void MultiplyTransform(Matrix matrix, MatrixOrder order)
{
if (matrix == null)
throw new ArgumentNullException("matrix");
int status = SafeNativeMethods.Gdip.GdipMultiplyPathGradientTransform(new HandleRef(this, this.NativeBrush),
new HandleRef(matrix, matrix.nativeMatrix),
order);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
///
///
/// Translates the local geometrical transform by the specified dimmensions. This
/// method prepends the translation to the transform.
///
///
public void TranslateTransform(float dx, float dy)
{
TranslateTransform(dx, dy, MatrixOrder.Prepend);
}
///
///
/// Translates the local geometrical transform by the specified dimmensions in
/// the specified order.
///
///
public void TranslateTransform(float dx, float dy, MatrixOrder order)
{
int status = SafeNativeMethods.Gdip.GdipTranslatePathGradientTransform(new HandleRef(this, this.NativeBrush),
dx, dy, order);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
///
///
/// Scales the local geometric transform by the specified amounts. This method
/// prepends the scaling matrix to the transform.
///
///
public void ScaleTransform(float sx, float sy)
{
ScaleTransform(sx, sy, MatrixOrder.Prepend);
}
///
///
/// Scales the local geometric transform by the specified amounts in the
/// specified order.
///
///
public void ScaleTransform(float sx, float sy, MatrixOrder order)
{
int status = SafeNativeMethods.Gdip.GdipScalePathGradientTransform(new HandleRef(this, this.NativeBrush),
sx, sy, order);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
///
///
/// Rotates the local geometric transform by the specified amount. This method
/// prepends the rotation to the transform.
///
///
public void RotateTransform(float angle)
{
RotateTransform(angle, MatrixOrder.Prepend);
}
///
///
/// Rotates the local geometric transform by the specified amount in the
/// specified order.
///
///
public void RotateTransform(float angle, MatrixOrder order)
{
int status = SafeNativeMethods.Gdip.GdipRotatePathGradientTransform(new HandleRef(this, this.NativeBrush),
angle, order);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
/**
* Set/get brush focus scales
*/
///
/// Gets or sets the focus point for the
/// gradient falloff.
///
public PointF FocusScales
{
get {
float[] scaleX = new float[] { 0.0f };
float[] scaleY = new float[] { 0.0f };
int status = SafeNativeMethods.Gdip.GdipGetPathGradientFocusScales(new HandleRef(this, this.NativeBrush), scaleX, scaleY);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return new PointF(scaleX[0], scaleY[0]);
}
set {
int status = SafeNativeMethods.Gdip.GdipSetPathGradientFocusScales(new HandleRef(this, this.NativeBrush), value.X, value.Y);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
}
/**
* Set/get brush wrapping mode
*/
private void _SetWrapMode(WrapMode wrapMode) {
int status = SafeNativeMethods.Gdip.GdipSetPathGradientWrapMode(new HandleRef(this, this.NativeBrush), (int) wrapMode);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
}
private WrapMode _GetWrapMode() {
int mode = 0;
int status = SafeNativeMethods.Gdip.GdipGetPathGradientWrapMode(new HandleRef(this, this.NativeBrush), out mode);
if (status != SafeNativeMethods.Gdip.Ok)
throw SafeNativeMethods.Gdip.StatusException(status);
return (WrapMode) mode;
}
///
///
/// Gets or sets a
///
public WrapMode WrapMode
{
get {
return _GetWrapMode();
}
set {
//validate the WrapMode enum
if (!ClientUtils.IsEnumValid(value, (int)value, (int)WrapMode.Tile, (int)WrapMode.Clamp))
{
throw new InvalidEnumArgumentException("value", (int)value, typeof(WrapMode));
}
_SetWrapMode(value);
}
}
}
}
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