C# 突出显示效果，如剪断工具
我正在创建一个新的剪贴工具，类似于Windows7剪贴工具 然而，我不能得到同样的高光效果 例如，剪切工具“高光”的工作原理如下：（高光在白色背景上非常明亮，看起来没有透明度 我的剪贴工具高亮显示如下： 我确信使用的颜色是相同的（255255,0），alpha通道为110。如果我降低透明度，它只会覆盖下面的文本 我的剪贴画将透明度应用到白色的顶部，而windows剪贴工具似乎将其更好地融合在一起 我做错了什么 我用于突出显示批注的代码是：C# 突出显示效果，如剪断工具,c#,winforms,graphics,C#,Winforms,Graphics,我正在创建一个新的剪贴工具，类似于Windows7剪贴工具 然而，我不能得到同样的高光效果 例如，剪切工具“高光”的工作原理如下：（高光在白色背景上非常明亮，看起来没有透明度 我的剪贴工具高亮显示如下： 我确信使用的颜色是相同的（255255,0），alpha通道为110。如果我降低透明度，它只会覆盖下面的文本 我的剪贴画将透明度应用到白色的顶部，而windows剪贴工具似乎将其更好地融合在一起 我做错了什么 我用于突出显示批注的代码是： using System; using System
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Sicon.Snipper.Annotations
{
/// <summary>
/// Highlight Annotation
/// </summary>
public class HighlightAnnotation : BaseAnnotation
{
#region Members
protected Rectangle _selection = Rectangle.Empty;
protected const int _transparancyAlpha = 110;
private Brush _brush;
#endregion Members
#region Properties
/// <summary>
/// Gets or Sets the Brush
/// </summary>
protected Brush Brush
{
get { return _brush; }
set { _brush = value; }
}
/// <summary>
/// Gets the Selection
/// </summary>
public Rectangle Selection
{
get { return _selection; }
protected set { _selection = value; }
}
#endregion Properties
#region Constructors
/// <summary>
/// Constructor
/// </summary>
/// <param name="imageRef">Reference to the image</param>
public HighlightAnnotation(Image imageRef, Control host)
: base(imageRef, Pens.Yellow, host)
{
this.Brush = new SolidBrush(
Color.FromArgb(
_transparancyAlpha,
this.Pen.Color));
}
#endregion Constructors
#region Methods
/// <summary>
/// Handles on Mouse down
/// </summary>
/// <param name="e">args</param>
public override void OnMouseDown(MouseEventArgs e)
{
if (base.Enabled)
{
// Start the snip on mouse down
if (e.Button != MouseButtons.Left) return;
_startPoint = e.Location;
_selection = new Rectangle(e.Location, new Size(0, 0));
}
}
/// <summary>
/// Handles Mouse Move
/// </summary>
/// <param name="e">args</param>
public override void OnMouseMove(MouseEventArgs e)
{
if (base.Enabled)
{
// Modify the selection on mouse move
if (e.Button != MouseButtons.Left) return;
int x1 = Math.Min(e.X, _startPoint.X);
int y1 = Math.Min(e.Y, _startPoint.Y);
int x2 = Math.Max(e.X, _startPoint.X);
int y2 = Math.Max(e.Y, _startPoint.Y);
_selection = new Rectangle(x1, y1, x2 - x1, y2 - y1);
}
}
/// <summary>
/// Handles on mouse up
/// </summary>
/// <param name="e">args</param>
public override void OnMouseUp(MouseEventArgs e)
{
if (base.Enabled)
{
if (_selection.Width <= 0 || _selection.Height <= 0) return;
using (Graphics g = Graphics.FromImage(this.ImageRef))
{
Rectangle dest = new Rectangle(
TranslateCenterImageMousePosition(_startPoint),
_selection.Size);
g.FillRectangle(
this.Brush,
dest);
}
this.Enabled = false;
}
}
/// <summary>
/// Hanles on paint
/// </summary>
/// <param name="g">graphics</param>
public override void OnPaint(System.Drawing.Graphics g)
{
if (base.Enabled)
g.FillRectangle(this.Brush, _selection);
}
#endregion Methods
}
}
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Sicon.Snipper.Enums;
using Sicon.Snipper.Tools;
namespace Sicon.Snipper.Annotations
{
/// <summary>
/// Highlight Annotation
/// </summary>
public class HighlightAnnotation : BaseAnnotation
{
#region Members
protected Rectangle _selection = Rectangle.Empty;
protected const int _transparancyAlpha = 110;
private ShapeEnum _shape = ShapeEnum.Rectangle;
List<Point> points = new List<Point>();
private const int PS_SOLID = 0;
private const int R2_MASKPEN = 9;
private const int R2_COPYPEN = 13;
#endregion Members
#region Properties
/// <summary>
/// Gets or Sets the Shape
/// </summary>
public ShapeEnum Shape
{
get { return _shape; }
set { _shape = value; }
}
/// <summary>
/// Gets the Selection
/// </summary>
public Rectangle Selection
{
get { return _selection; }
protected set { _selection = value; }
}
#endregion Properties
#region Constructors
/// <summary>
/// Constructor
/// </summary>
/// <param name="imageRef">Reference to the image</param>
public HighlightAnnotation(Image imageRef, Control host, ShapeEnum shape)
: base(imageRef, new Pen(Color.Yellow, 16), host)
{
_shape = shape;
}
#endregion Constructors
#region Methods
/// <summary>
/// Handles on Mouse down
/// </summary>
/// <param name="e">args</param>
public override void OnMouseDown(MouseEventArgs e)
{
if (base.Enabled)
{
// Start the snip on mouse down
if (e.Button != MouseButtons.Left) return;
_startPoint = e.Location;
_selection = new Rectangle(e.Location, new Size(0, 0));
}
}
/// <summary>
/// Handles Mouse Move
/// </summary>
/// <param name="e">args</param>
public override void OnMouseMove(MouseEventArgs e)
{
if (base.Enabled)
{
// Modify the selection on mouse move
if (e.Button != MouseButtons.Left) return;
//Add freehand points
points.Add(new Point(e.X, e.Y));
//Update selection rectangele
int x1 = Math.Min(e.X, _startPoint.X);
int y1 = Math.Min(e.Y, _startPoint.Y);
int x2 = Math.Max(e.X, _startPoint.X);
int y2 = Math.Max(e.Y, _startPoint.Y);
_selection = new Rectangle(x1, y1, x2 - x1, y2 - y1);
}
}
/// <summary>
/// Handles on mouse up
/// </summary>
/// <param name="e">args</param>
public override void OnMouseUp(MouseEventArgs e)
{
if (base.Enabled)
{
if (_selection.Width <= 0 || _selection.Height <= 0) return;
using (Graphics g = Graphics.FromImage(this.ImageRef))
{
switch (this.Shape)
{
case ShapeEnum.Freehand:
DrawHighlight(g, points.ToArray());
break;
case ShapeEnum.Rectangle:
Rectangle dest = new Rectangle(
TranslateCenterImageMousePosition(_startPoint),
_selection.Size);
DrawRectange(g);
break;
default: return;
}
}
this.Enabled = false;
}
}
/// <summary>
/// Hanles on paint
/// </summary>
/// <param name="g">graphics</param>
public override void OnPaint(System.Drawing.Graphics g)
{
if (base.Enabled)
{
switch (this.Shape)
{
case ShapeEnum.Freehand:
DrawHighlight(g, points.ToArray());
break;
case ShapeEnum.Rectangle:
DrawRectange(g);
break;
default: return;
}
}
}
/// <summary>
/// Draws a highlight
/// </summary>
/// <param name="g">graphics</param>
/// <param name="usePoints">points to draw</param>
private void DrawHighlight(Graphics g, Point[] usePoints)
{
int useColor = System.Drawing.ColorTranslator.ToWin32(base.Pen.Color);
IntPtr pen = GDI32.CreatePen(PS_SOLID, (int)base.Pen.Width, (uint)useColor);
IntPtr hDC = g.GetHdc();
IntPtr xDC = GDI32.SelectObject(hDC, pen);
GDI32.SetROP2(hDC, R2_MASKPEN);
for (int i = 1; i <= usePoints.Length - 1; i++)
{
Point p1 = usePoints[i - 1];
Point p2 = usePoints[i];
GDI32.MoveToEx(hDC, p1.X, p1.Y, IntPtr.Zero);
GDI32.LineTo(hDC, p2.X, p2.Y);
}
GDI32.SetROP2(hDC, R2_COPYPEN);
GDI32.SelectObject(hDC, xDC);
GDI32.DeleteObject(pen);
g.ReleaseHdc(hDC);
}
/// <summary>
/// Draws a rectangle
/// </summary>
/// <param name="g">Graphics</param>
private void DrawRectange(Graphics g)
{
Rectangle dest = new Rectangle(
TranslateCenterImageMousePosition(_startPoint),
_selection.Size);
int useColor = System.Drawing.ColorTranslator.ToWin32(base.Pen.Color);
IntPtr pen = GDI32.CreatePen(PS_SOLID, (int)base.Pen.Width, (uint)useColor);
IntPtr hDC = g.GetHdc();
IntPtr xDC = GDI32.SelectObject(hDC, pen);
GDI32.SetROP2(hDC, R2_MASKPEN);
GDI32.Rectangle(hDC, dest.Left, dest.Top, dest.Right, dest.Bottom);
GDI32.SetROP2(hDC, R2_COPYPEN);
GDI32.SelectObject(hDC, xDC);
GDI32.DeleteObject(pen);
g.ReleaseHdc(hDC);
}
#endregion Methods
}
}
使用系统；
使用System.Collections.Generic；
使用系统图；
使用System.Linq；
使用系统文本；
使用System.Windows.Forms；
使用Sicon.Snipper.Enums；
使用Sicon.Snipper.Tools；
命名空间Sicon.Snipper.Annotations
{
///
///突出显示注释
///
公共类HighlightAnnotation:BaseAnnotation
{
#区域成员
受保护矩形_selection=Rectangle.Empty；
保护常数int_transparancyAlpha=110；
私有shapenum _shape=shapenum.Rectangle；
列表点=新列表（）；
私有常量int PS_SOLID=0；
私有常量int R2_MASKPEN=9；
私有常量int R2_COPYPEN=13；
#端区成员
#区域属性
///
///获取或设置形状
///
公共形状
{
获取{return\u shape；}
设置{u shape=value；}
}
///
///获取所选内容
///
公共矩形选择
{
获取{return\u selection；}
受保护集{u selection=value；}
}
#端域属性
#区域构造函数
///
///建造师
///
///对图像的引用
公共HighlightAnnotation（图像imageRef、控件主机、ShapeEnum形状）
：底座（imageRef，新笔（颜色：黄色，16），主机）
{
_形状=形状；
}
#端域构造函数
#区域方法
///
///把手放在鼠标下
///
///args
MouseDown上的公共覆盖无效（MouseEventArgs e）
{
如果（基本启用）
{
//开始剪断鼠标
如果（e.Button！=MouseButtons.Left）返回；
_起始点=e.位置；
_选择=新矩形（例如位置，新大小（0,0））；
}
}
///
///控制鼠标移动
///
///args
mouseMove上的公共覆盖无效（MouseEventArgs e）
{
如果（基本启用）
{
//在鼠标移动时修改选择
如果（e.Button！=MouseButtons.Left）返回；
//添加徒手点
增加（新点（e.X，e.Y））；
//更新选择矩形
int x1=数学最小值（e.X，_startPoint.X）；
int y1=数学最小值（e.Y，_startPoint.Y）；
int x2=数学最大值（e.X，_startPoint.X）；
int y2=数学最大值（e.Y，_startPoint.Y）；
_选择=新矩形（x1，y1，x2-x1，y2-y1）；
}
}
///
///鼠标上的手柄向上
///
///args
MouseUp上的公共覆盖无效（MouseEventArgs e）
{
如果（基本启用）
{
如果（_selection.Width，则不能使用alpha通道，因为那样会使黄色褪色
我认为您必须走老路，为此使用WIN32 API：
[DllImport("gdi32.dll")]
static extern int SetROP2(IntPtr hdc, int fnDrawMode);
[DllImport("gdi32.dll")]
static extern IntPtr CreatePen(int fnPenStyle, int nWidth, uint crColor);
[DllImport("gdi32.dll")]
static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
[DllImport("gdi32.dll")]
static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
static extern bool MoveToEx(IntPtr hdc, int X, int Y, IntPtr lpPoint);
[DllImport("gdi32.dll")]
static extern bool LineTo(IntPtr hdc, int nXEnd, int nYEnd);
private const int PS_SOLID = 0;
private const int R2_MASKPEN = 9;
private const int R2_COPYPEN = 13;
Bitmap bmp = (Bitmap)Image.FromFile(@"c:\....png");
List<Point> points = new List<Point>();
结果是：
要直接在图像上而不是在控件的图形对象上绘制，需要进行更多的API调用：
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hdcDst, int x1, int y1, int cx, int cy,
IntPtr hdcSrc, int x2, int y2, int rop);
[DllImport("gdi32.dll")]
static extern IntPtr CreateCompatibleDC(IntPtr hdc);
[DllImport("gdi32.dll")]
static extern bool DeleteDC(IntPtr hdc);
private const int SRCCOPY = 0x00CC0020;
这是修改后的代码：
private void DrawHighlight(Point[] usePoints, int brushSize, Color brushColor) {
using (Graphics gBMP = Graphics.FromImage(bmp)) {
IntPtr hBMP = bmp.GetHbitmap();
IntPtr bDC = gBMP.GetHdc();
IntPtr mDC = CreateCompatibleDC(bDC);
IntPtr oDC = SelectObject(mDC, hBMP);
int useColor = System.Drawing.ColorTranslator.ToWin32(brushColor);
IntPtr pen = CreatePen(PS_SOLID, brushSize, (uint)useColor);
IntPtr xDC = SelectObject(mDC, pen);
SetROP2(mDC, R2_MASKPEN);
for (int i = 1; i <= usePoints.Length - 1; i++) {
Point p1 = usePoints[i - 1];
Point p2 = usePoints[i];
MoveToEx(mDC, p1.X, p1.Y, IntPtr.Zero);
LineTo(mDC, p2.X, p2.Y);
}
SetROP2(mDC, R2_COPYPEN);
BitBlt(bDC, 0, 0, bmp.Width, bmp.Height, mDC, 0, 0, SRCCOPY);
SelectObject(mDC, xDC);
DeleteObject(pen);
gBMP.ReleaseHdc(bDC);
SelectObject(mDC, oDC);
DeleteDC(mDC);
DeleteObject(hBMP);
}
}
private void DrawHighlight（点[]usePoints，int-brushSize，Color-brushColor）{
使用（Graphics gBMP=Graphics.FromImage（bmp））{
IntPtr hBMP=bmp.GetHbitmap（）；
IntPtr bDC=gBMP.GetHdc（）；
IntPtr mDC=CreateCompatibleDC（bDC）；
IntPtr oDC=选择对象（mDC、hBMP）；
int useColor=System.Drawing.ColorTranslator.ToWin32（brushColor）；
IntPtr pen=CreatePen（PS_实体，笔刷大小，（uint）使用颜色）；
IntPtr xDC=选择对象（mDC、笔）；
SetROP2（mDC，R2_MASKPEN）；
对于（int i=1；我哇，谢谢，看起来它会起作用！我会尽快做一些更改，然后再联系你嗨，我有点进一步，但现在有另外两个问题，我喜欢你的徒手画想法，所以添加了一个形状枚举来绘制徒手画或矩形。我已经添加了一个更新的问题。你介意再看一看吗和我一起？我可以发送整个源代码，但我使用的是devexpress组件，所以不确定你是否有这些组件？@WraithNath我更新了帖子以在位图上绘制。太棒了！在徒手和矩形模式下都能正常工作。感谢你坚持使用此组件：）。如果你能推荐一些阅读资料，我不介意再学习一些dgi绘图？@LarsTech你能给我发邮件吗？我知道这是一个老帖子，但我想问你一些关于你发布的代码的问题。
protected override void OnMouseMove(MouseEventArgs e) {
base.OnMouseMove(e);
if (e.Button == MouseButtons.Left) {
points.Add(new Point(e.X, e.Y));
this.Invalidate();
}
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
e.Graphics.Clear(Color.White);
e.Graphics.DrawImage(bmp, Point.Empty);
DrawHighlight(e.Graphics, points.ToArray(), 16, Color.Yellow);
}
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hdcDst, int x1, int y1, int cx, int cy,
IntPtr hdcSrc, int x2, int y2, int rop);
[DllImport("gdi32.dll")]
static extern IntPtr CreateCompatibleDC(IntPtr hdc);
[DllImport("gdi32.dll")]
static extern bool DeleteDC(IntPtr hdc);
private const int SRCCOPY = 0x00CC0020;
private void DrawHighlight(Point[] usePoints, int brushSize, Color brushColor) {
using (Graphics gBMP = Graphics.FromImage(bmp)) {
IntPtr hBMP = bmp.GetHbitmap();
IntPtr bDC = gBMP.GetHdc();
IntPtr mDC = CreateCompatibleDC(bDC);
IntPtr oDC = SelectObject(mDC, hBMP);
int useColor = System.Drawing.ColorTranslator.ToWin32(brushColor);
IntPtr pen = CreatePen(PS_SOLID, brushSize, (uint)useColor);
IntPtr xDC = SelectObject(mDC, pen);
SetROP2(mDC, R2_MASKPEN);
for (int i = 1; i <= usePoints.Length - 1; i++) {
Point p1 = usePoints[i - 1];
Point p2 = usePoints[i];
MoveToEx(mDC, p1.X, p1.Y, IntPtr.Zero);
LineTo(mDC, p2.X, p2.Y);
}
SetROP2(mDC, R2_COPYPEN);
BitBlt(bDC, 0, 0, bmp.Width, bmp.Height, mDC, 0, 0, SRCCOPY);
SelectObject(mDC, xDC);
DeleteObject(pen);
gBMP.ReleaseHdc(bDC);
SelectObject(mDC, oDC);
DeleteDC(mDC);
DeleteObject(hBMP);
}
}