缩放Picturebox不会改变图像

我正在使用图片框来创建我的桁架类的实例的视觉效果。我通过在绘画事件中直接绘制到图片框来创建视觉效果。该方法是这样的缩放Picturebox不会改变图像

private void pictureBox1_Paint(object sender, PaintEventArgs e) 
{ 
    if (isDraw) 
    { 
     //Preparing to draw 
     Graphics g = e.Graphics; 
     g.SmoothingMode = SmoothingMode.AntiAlias; 
     g.InterpolationMode = InterpolationMode.Bicubic; 
     RunEntry entry = this.passedHistory.SelectedItem as RunEntry; 
     AnsFile objToDraw = entry.FileRead; 
     Pen pen = new Pen(Color.Black); 

     //Getting size of bitmap 
     int maxWidth = 0, maxHeight = 0; 
     foreach (AnsJoint joint in objToDraw.AnsJoints) 
     { 
      if (joint.Location.X.Length > maxWidth) 
      { 
       maxWidth = (int)joint.Location.X.Length; 
      } 
      if (joint.Location.Y.Length > maxHeight) 
      { 
       maxHeight = (int)joint.Location.Y.Length; 
      } 
     } 

     //Drawing joints 
     foreach (AnsJoint joint in objToDraw.AnsJoints) 
     { 
      PointF jointPoint = this.ToCartesian(new PointF((float)joint.Location.X.Length - 4f, (float)joint.Location.Y.Length + 10f), maxHeight); 
      e.Graphics.DrawString(joint.JointID.ToString(), new Font(FontFamily.GenericMonospace, 6f, FontStyle.Regular, GraphicsUnit.Point, 1, false), Brushes.Black, jointPoint); 
     } 

     //Draw the panels and links 
     foreach (AnsMember member in objToDraw.AnsMembers) 
     { 
      List<AnsPanel> panels = member.Panels; //Drawing the panels 

      foreach (AnsPanel pan in panels) 
      { 
       pen.Color = Color.Red; 
       PointF p1 = this.ToCartesian(new PointF((float)pan.I.Location.X.Length, (float)pan.I.Location.Y.Length), maxHeight); 
       PointF p2 = this.ToCartesian(new PointF((float)pan.J.Location.X.Length, (float)pan.J.Location.Y.Length), maxHeight); 

       g.DrawEllipse(pen, p1.X - 2.5f, p1.Y - 2.5f, 5, 5); 
       g.DrawEllipse(pen, p2.X - 2.5f, p2.Y - 2.5f, 5, 5); 

       g.DrawEllipse(pen, p1.X - 3, p1.Y - 3.3f, 5, 5); 
       g.DrawEllipse(pen, p2.X - 3, p2.Y - 3.3f, 5, 5); 
       pen.Color = Color.Black; 
       g.DrawLine(pen, p1, p2); 
      } 
      List<AnsLink> links = member.Links; //Drawing the links 
      foreach (AnsLink link in links) 
      { 
       PointF p1 = this.ToCartesian(new PointF((float)link.I.Location.X.Length, (float)link.I.Location.Y.Length), maxHeight); 
       PointF p2 = this.ToCartesian(new PointF((float)link.J.Location.X.Length, (float)link.J.Location.Y.Length), maxHeight); 
       g.FillEllipse(Brushes.Green, p1.X - 1.5f, p1.Y - 1.5f, 3, 3); 
       g.FillEllipse(Brushes.Green, p2.X - 1.5f, p2.Y - 1.5f, 3, 3); 
       g.DrawLine(pen, p1, p2); 
      } 
     } 
     g.ScaleTransform(.5f, .5f); 
     pictureBox1.Tag = entry.FileName; 
    } 
}

其中产量我期待

，只是我想桁架图像缩放，填补了PictureBox的更多结果。我将ScaleTransform调用添加到绘制事件方法的末尾，但这看起来没有任何影响，因为图片的大小是相同的，无论是否有调用。我怎样才能将我在画框上画的东西缩放到画框的大小？

来源

2016-04-14 Nick Gilbert

我从来没有使用ScaleTransform，但这个问题的答案表明，它需要绘图调用之前设置：http://stackoverflow.com/questions/22615138/apply-scaletransform-to-graphics-gdi（此外，它看起来像你的变换将缩小图形，而不是up。） – adv12

修复它！够简单。添加它作为答案，我会接受它 –

在您绘制之前请致电ScaleTransform。你可以计算出所需的比例因子是这样的：

// place this code after the calculation of maxWidth and maxHeight 
// but before the drawing code 
PictureBox p = (PictureBox)sender; 
float scaleFactor = Math.Min(
    ((float)p.Width)/maxWidth, 
    ((float)p.Height)/maxHeight 
); 

g.ScaleTransform(scaleFactor, scaleFactor);

来源

2016-04-14 16:25:35 adv12

缩放Picturebox不会改变图像

回答

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