/// <summary>
/// 改变放大倍率时的放大区域自调整，为了提高精度，插件设置范围是10-100，对应1-10倍，这样可以0.1倍精度调整
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Magnivalue_ValueChanged(object sender, EventArgs e)
{
//直接根据放大区域的图的中心找到左上角
float target_X = Mouse_X - magniBox.Width / (2 * (magnivalue.Value / 10));
float target_Y = Mouse_Y - magniBox.Height / (2 * (magnivalue.Value / 10));
#region 提取根据放大倍数得到的区域图片
//建立新的图片
Bitmap b = new Bitmap(magniBox.Width / (magnivalue.Value / 10), magniBox.Height / (magnivalue.Value / 10));
//建立画布，在画布上建立图形
Graphics g = Graphics.FromImage((System.Drawing.Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
RectangleF srcRect = new RectangleF(target_X, target_Y, target_X + magniBox.Width / (magnivalue.Value / 10),
target_Y + magniBox.Height / (magnivalue.Value / 10)); //显示图像那一部分
GraphicsUnit units = GraphicsUnit.Pixel; //源矩形的度量单位设置为像素
//绘制图像，可用的方法有很多
g.DrawImage(origin_Pic.GetImage, 0, 0, srcRect, units);
//释放内存
g.Dispose();
GC.Collect();
#endregion
//将整个区域的图调整大小
magniBox.Image = PicFunction.resizeImage((System.Drawing.Image)b, magniBox.Size);
}
/// <summary>
/// //获取鼠标所在的位置并提取图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>鼠标数据，X、Y从中提取
private void OriPicBox_MouseMove(object sender, MouseEventArgs e)
{
//无图片时不提取
if (origin_Pic == null)
{
return;
}
Mouse_X = e.X;
Mouse_Y = e.Y;
//根据鼠标位置反推计算原图上对应的位置，并根据放大倍数来确定对应矩形的左上角顶点，
float target_X = e.X / nPercentW - magniBox.Width / (2 * (magnivalue.Value / 10));
float target_Y = e.Y / nPercentH - magniBox.Height / (2 * (magnivalue.Value / 10));
#region 提取根据放大倍数得到的区域图片
//建立新的图片
Bitmap b = new Bitmap(magniBox.Width / (magnivalue.Value / 10), magniBox.Height / (magnivalue.Value / 10));
//建立画布，在画布上建立图形
Graphics g = Graphics.FromImage((System.Drawing.Image)b);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
RectangleF srcRect = new RectangleF(target_X, target_Y, target_X + magniBox.Width / (magnivalue.Value / 10),
target_Y + magniBox.Height / (magnivalue.Value / 10)); //显示图像那一部分
GraphicsUnit units = GraphicsUnit.Pixel; //源矩形的度量单位设置为像素
//绘制图像，可用的方法有很多
g.DrawImage(origin_Pic.GetImage, 0, 0, srcRect, units);
//释放内存
g.Dispose();
GC.Collect();
#endregion
//将整个区域的图调整大小
magniBox.Image = PicFunction.resizeImage((System.Drawing.Image)b, magniBox.Size);
}
/// <summary>
/// 读取图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ReadButton_Click(object sender, EventArgs e)
{
#region 读取图片
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "图像文件|*.jpg;*.bmp;*.png;*.jpeg";
openFileDialog1.Title = "打开图像";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
//以前用的Image img,然后origin_Image=img
//并在最后img.dipose释放后，因为指向的同一个对象，此时origin_Image也没有东西了
//为了提高内存使用率，就不再单独声明一个Image，如果一定要生命的话，就必须使用Clone
//Image img = (Image)origin_Image.Clone();
origin_Pic = new PicProperty(openFileDialog1.FileName, Image.FromFile(openFileDialog1.FileName, true));
oriPicBox.Image = PicFunction.resizeImage(origin_Pic.GetImage, oriPicBox.Size);
//计算宽度的缩放比例
nPercentW = oriPicBox.Width / (float)origin_Pic.Width;
//计算高度的缩放比例
nPercentH = oriPicBox.Height / (float)origin_Pic.Height;
//显示数据
PicPropertyGrid.SelectedObject = origin_Pic;
}
#endregion
}
