控件实现了截图、绘制矩形、圆形、箭头、线条、文字，还需要可以撤销绘制步骤、保存图形等功能，基本实现了跟QQ2008截图一样的功能，还可以更换颜色样式和鼠标的样式。截图时候的效果图如下：


相关文章：

1、C# 实现完整功能的截图控件(1)-实现绘图工具栏控件

2、C# 实现完整功能的截图控件(2)-实现颜色和字体选择控件

3、C# 实现完整功能的截图控件(3)-实现漂亮的快捷菜单

4、C# 实现完整功能的截图控件(4)-完整版

C# 实现完整功能的截图控件(1)-实现绘图工具栏控件

之前写了一篇关于截图的文章(查看)，只实现了简单的截图，接下的文章将介绍怎样一步步的实现一个完整的截图控件。这篇文章将介绍怎样实现绘图工具栏控件DrawToolsControl，先来了解一下这个工具栏控件包含些什么内容。因为只对截图实现添加一些简单的图形和文字绘制，所以只实现了添加矩形、椭圆、箭头、文字和线条，所以工具栏需要包含绘制矩形、椭圆、箭头、文字和线条按钮。因为还要实现撤销、保存截图等，所以工具栏还要添加撤销、保存、退出和保存当前图形的按钮。需要的按钮就这么多了，我们可以用ToolStrip来添加这些按钮，但是为了控件看起来更漂亮，需要对ToolStrip进行重绘，下面就具体怎样实现DrawToolsControl控件。

第一步：继承UserControl控件，在上面添加一个ToolStrip，然后添加前面所说的所有按钮，调整好UserControl控件的大小，让它刚好可以显示完整的ToolStrip。

第二步：添加相应按钮的点击事件，具体就不一一列出了。

第三步：对UserControl进行重绘。先改变UserControl的Region，让它为圆角的样式，然后重绘背景和边框。

第四步：对ToolStrip进行重绘。这是比较重要的，绘制好的ToolStrip还可以在其他地方使用。对ToolStrip实现重绘，需要继承ToolStripRenderer类实现一个新的ToolStripRendererEx类，根据需要，对OnRenderToolStripBackground、OnRenderButtonBackground和OnRenderSeparator方法进行重写，然后把ToolStrip的Renderer属性设置为新的ToolStripRendererEx就行了。

来看看实现的关键代码:

1、  UserControl设置Region和绘制代码：

        protected override void OnPaint(PaintEventArgs e)

        {

            base.OnPaint(e);

 

            Graphics g = e.Graphics;

            g.SmoothingMode = SmoothingMode.AntiAlias;

 

            using (GraphicsPath path = GraphicsPathHelper.CreatePath(

               ClientRectangle, 8, RoundStyle.All, false))

            {

                using (SolidBrush brush = new SolidBrush(ColorTable.BackColorNormal))

                {

                    g.FillPath(brush, path);

                }

                using (Pen pen = new Pen(ColorTable.BorderColor))

                {

                    g.DrawPath(pen, path);

 

                    using (GraphicsPath innerPath = GraphicsPathHelper.CreatePath(

                        ClientRectangle, 8, RoundStyle.All, true))

                    {

                        g.DrawPath(pen, innerPath);

                    }

                }

            }

        }

 

        private void SetRegion()

        {

            using (GraphicsPath path = GraphicsPathHelper.CreatePath(

                ClientRectangle, 8, RoundStyle.All, false))

            {

                if (base.Region != null)

                {

                    base.Region.Dispose();

                }

                base.Region = new Region(path);

            }

        }

 

2、  ToolStripRendererEx重绘代码：

        protected override void OnRenderToolStripBackground(

            ToolStripRenderEventArgs e)

        {

            Graphics g = e.Graphics;

            g.SmoothingMode = SmoothingMode.AntiAlias;

 

            LinearGradientMode mode =

                    e.ToolStrip.Orientation == Orientation.Horizontal ?

                    LinearGradientMode.Vertical : LinearGradientMode.Horizontal;

            RenderBackgroundInternal(

               g,

               e.AffectedBounds,

               ColorTable.BackColorHover,

               ColorTable.BorderColor,

               ColorTable.BackColorNormal,

               RoundStyle.All,

               false,

               true,

               mode);

        }

 

        protected override void OnRenderButtonBackground(

            ToolStripItemRenderEventArgs e)

        {

            ToolStripButton item = e.Item as ToolStripButton;

            if (item != null)

            {

                LinearGradientMode mode =

                    e.ToolStrip.Orientation == Orientation.Horizontal ?

                    LinearGradientMode.Vertical : LinearGradientMode.Horizontal;

                Graphics g = e.Graphics;

                g.SmoothingMode = SmoothingMode.AntiAlias;

                Rectangle bounds = new Rectangle(Point.Empty, item.Size);

 

                if (item.BackgroundImage != null)

                {

                    Rectangle clipRect = item.Selected ? item.ContentRectangle : bounds;

                    ControlPaintEx.DrawBackgroundImage(

                        g,

                        item.BackgroundImage,

                        ColorTable.BackColorNormal,

                        item.BackgroundImageLayout,

                        bounds,

                        clipRect);

                }

 

                if (item.CheckState == CheckState.Unchecked)

                {

                    if (item.Selected)

                    {

                        Color color = ColorTable.BackColorHover;

                        if (item.Pressed)

                        {

                            color = ColorTable.BackColorPressed;

                        }

                        RenderBackgroundInternal(

                            g,

                            bounds,

                            color,

                            ColorTable.BorderColor,

                            ColorTable.BackColorNormal,

                            RoundStyle.All,

                            true,

                            true,

                            mode);

                        return;

                    }

                    else

                    {

                        if (e.ToolStrip is ToolStripOverflow)

                        {

                            using (Brush brush = new SolidBrush(ColorTable.BackColorNormal))

                            {

                                g.FillRectangle(brush, bounds);

                            }

                            return;

                        }

                    }

                }

                else

                {

                    Color color = ControlPaint.Light(ColorTable.BackColorHover);

                    if (item.Selected)

                    {

                        color = ColorTable.BackColorHover;

                    }

                    if (item.Pressed)

                    {

                        color = ColorTable.BackColorPressed;

                    }

                    RenderBackgroundInternal(

                        e.Graphics,

                        bounds,

                        color,

                        ColorTable.BorderColor,

                        ColorTable.BackColorNormal,

                        RoundStyle.All,

                        true,

                        true,

                        mode);

                    return;

                }

            }

 

            base.OnRenderButtonBackground(e);

        }

 

        protected override void OnRenderSeparator(

            ToolStripSeparatorRenderEventArgs e)

        {

            Rectangle rect = e.Item.ContentRectangle;

            if (e.ToolStrip is ToolStripDropDown)

            {

                if (e.Item.RightToLeft == RightToLeft.Yes)

                {

                    //rect.X -= OffsetMargin + 4;

                }

                else

                {

                    rect.X += OffsetMargin + 4;

                }

                rect.Width -= OffsetMargin + 8;

            }

            RenderSeparatorLine(

               e.Graphics,

               rect,

               ColorTable.BackColorPressed,

               ColorTable.BackColorNormal,

               SystemColors.ControlLightLight,

               e.Vertical);

        }

    单独的源码就先不传上来提供下载了，等整个项目写好后一起提供吧，看看DrawToolsControl的效果：

 

声明：

本文版权归作者和CS 程序员之窗所有，欢迎转载，转载必须保留以下版权信息，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。

作者：Starts_2000

出处：CS 程序员之窗 http://www.csharpwin.com。

你可以免费使用或修改提供的源代码，但请保留源代码中的版权信息，详情请查看：

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