扩展的图像浏览器

{A}
{S0}目录 简介
前段时间，我是一个发展中的一个数字档案系统，为政府土地管理办公室的团队的一部分。基本上，系统将尝试做的是整理和数字化的管理提供了数字归档副本存档的​​物理文件。该系统有针对性地解决许多与文件流转速度，并发访问，和许多挂钩的问题。
发现这个系统的好处之一是进行全面细致的的访问该文件，系统的用户能够更好地查看文档比实际观看，而通过了一堆文件。由于这些文件的年龄到几十年，其中大部分是手写的，此功能是该系统的吸引力设施之一。 PictureBox控件。NET包中包含一个简单的形式显示在一个单一的形象完美，但我们需要一个更好的预览所显示的图像的实现还需要一个控制，可以处理多个图像增强的一个。
我经历了我的个人项目，并发现，我对我自己的开始，这个解决方案可能是一个起点。数字档案系统最后实施的版本功能更强大，复杂的，但依靠我转发的设计。
非常基本的需求时，观看一组图像进行彻底的访问，在小学原油条款，如下:泛变焦图像之间的导航旋转
我决定设计一个更精细的细节，可以执行这些任务很容易控制。这种控制的实施涉及未成年人基本上都是有限的坐标平移和缩放的计算。让我澄清的翻译和涉及的坐标系统。

坐标转换或到另一个。
{S2}
ImageViewer的组成部分，是大会的主要组成部分，因为这是所有的计算和命令实施。几乎每一个旋转，所有这些，我已减少到翻译中心的变焦值的显示和缩放功能，除了观看一个单独的图像时所需的命令。喜欢例如，抢夺和平移图像时，我们描述的中心和缩放功能的操作。
泛:缩放保持相同展示中心翻译在x坐标变化和y坐标的变化
下面是它是如何为所有的操作描述:

private void pic_MouseMove(object sender, MouseEventArgs e)

{

    //when a mouse is down and moving 

    //panning and region selection are posibilities

    switch (previewMode)

    {

        case PreviewMode.REGIONSELECTION:

            if (e.Button==MouseButtons.Left)

            {

                //display a rectangular region to the selected region 

                //to notify the user what he is selecting

                int w = Math.Abs(tempCenter.X - e.X), h = Math.Abs(tempCenter.Y - e.Y);

                if (w > 1 || h > 1)

                {

                    this.Refresh();

                    Graphics gr = pic.CreateGraphics();

                    gr.DrawString("(" + (tempCenter.X + e.X) / 2 + "," + 

                                 (tempCenter.Y + e.Y) / 2 + ")", this.Font, 

                                 Brushes.Khaki, new PointF((tempCenter.X + e.X) / 2, 

                                 (tempCenter.Y + e.Y) / 2));

                    gr.DrawRectangle(Pens.Red, new Rectangle((tempCenter.X + e.X - w) / 2, 

                                    (tempCenter.Y + e.Y - h) / 2, w, h));

                    gr.Dispose();

                }

            }

            break;

        case PreviewMode.PAN:

            if (e.Button==MouseButtons.Left&&(tempCenter.X != e.X || 

                                                      tempCenter.Y != e.Y))

            {

                displayCenter = new Point(displayCenter.X + 

                    (int)((tempCenter.X- e.X ) / mZoom),

                    displayCenter.Y + (int)((tempCenter.Y-e.Y) / mZoom));

                ZoomImage();

                tempCenter = e.Location;

            }

            break;

        default:

            break;

    }

}



private void pic_MouseUp(object sender, MouseEventArgs e)

{

    //when the mouse is up its when most of the previews are commited

    switch (previewMode)

    {

        case PreviewMode.REGIONSELECTION:

            displayCenter = new Point(displayCenter.X + 

                (int)(((double)(tempCenter.X + e.X - this.Width) / 2) / mZoom),

                displayCenter.Y + (int)(((double)(tempCenter.Y + 

                e.Y - this.Height) / 2) / mZoom));



    double z = mZoom * pic.Width / Math.Abs(tempCenter.X - e.X);

    if (mZoom * pic.Height / Math.Abs(tempCenter.Y - e.Y) < z)

        z = mZoom * pic.Height / Math.Abs(tempCenter.Y - e.Y);

    mZoom = z;

    ZoomImage();

    break;

        case PreviewMode.ZOOMIN:

            //when zoom in the zoom value is simply multiplied by two

            displayCenter=new Point(displayCenter.X+(int)((e.X-this.Width/2)/mZoom),

                displayCenter.Y+(int)((e.Y-this.Height/2)/mZoom));

            mZoom *= 2;

            //redraw the image with the new zoom value

            ZoomImage();

            break;

        case PreviewMode.ZOOMOUT:

            //when zoom out the zoom value is simply divided by two

            displayCenter = new Point(displayCenter.X + 

                (int)((e.X - this.Width / 2) / mZoom), 

                 displayCenter.Y + (int)((e.Y - this.Height / 2) / mZoom));

            mZoom /= 2;

            //redraw the image with the new zoom value

            ZoomImage();

            break;

        default:

            break;

    }

}

private void btn_Click(object sender, EventArgs e)

{

    img.ImagePreviewMode = (PreviewMode)Enum.Parse(typeof(PreviewMode), 

                           ((ToolStripButton)sender).Tag.ToString());

    btnPan.Checked = img.ImagePreviewMode == PreviewMode.PAN;

    btnRegionZoom.Checked = img.ImagePreviewMode == PreviewMode.REGIONSELECTION;

    btnZoomIn.Checked = img.ImagePreviewMode == PreviewMode.ZOOMIN;

    btnZoomOut.Checked = img.ImagePreviewMode == PreviewMode.ZOOMOUT;

    switch (img.ImagePreviewMode)

    {

        case PreviewMode.PAN:

            this.Cursor = Cursors.Hand;

            break;

        case PreviewMode.REGIONSELECTION:

            this.Cursor = Cursors.Cross;

            break;

        default:

            this.Cursor = Cursors.Default;

            break;



    }

}

/// <summary>

/// a signiture interface that when implemented by any object

/// enables it to utilize the image viewer component

/// </summary>

public interface IZImage

{

    //gets the number of images that are available for display

    int ImageCount{ get;}

    //gets the current index of the image that is being displayed



    int CurrentIndex { get;}

    //retreives the next available image

    Image GetNextImage();

    //retrieves the previously displayed image

    Image GetPreviousImage();

}

public class DirectoryImages:IZImage

{

    //path of the directory

    string m_DirectoryName;

    //number of the image files that are found

    int m_ImageFilesCount;



    int m_CurrentIndex=-1;

    string[] ImageFiles;



    public DirectoryImages(string str)

    {

        m_DirectoryName = str;

        ImageFiles = Directory.GetFiles(str, "*.jpg");

        m_ImageFilesCount = ImageFiles.Length;

    }



    #region IZImage Members



    public int ImageCount

    {

        get { return m_ImageFilesCount; }

    }



    public int CurrentIndex

    {

        get { return m_CurrentIndex; }

    }



    public System.Drawing.Image GetNextImage()

    {

        m_CurrentIndex++;

        if (m_CurrentIndex >= m_ImageFilesCount)

            throw new Exception("No More Images");

        return System.Drawing.Image.FromFile(ImageFiles[m_CurrentIndex]);

    }



    public System.Drawing.Image GetPreviousImage()

    {

        m_CurrentIndex--;

        if (m_CurrentIndex <= 0)

            throw new Exception("No More Images");

        return System.Drawing.Image.FromFile(ImageFiles[m_CurrentIndex]);

    }



    #endregion

}