面板绘图放大C#

Question

我有一个包含面板的表单,在这个面板中我绘制形状,如矩形和圆形,我需要放大这些形状,我看到几个选项,但大多数使用PictureBox.我应该使用位图创建面板区域作为位图并更改缩放系数?? 如果我想要进行平移并且不能在面板尺寸中绘制图像,这对我的帮助也会更大.

这是我的代码的快照

  private void panel1_Paint(object sender, PaintEventArgs e)
    {
        Graphics g = panel1.CreateGraphics();
        SolidBrush myBrush = new SolidBrush(Color.Black);
        Pen p = new Pen(Color.Black);
        int RecScale = 1;
        foreach (CircuitData.ResistorRow resistorRow in ResistorData.Resistor)
        {
            RectangleF rec = new RectangleF((float)(resistorRow.CenterX - resistorRow.Length / 2), (float)(resistorRow.CenterY - resistorRow.Width/ 2), (float)resistorRow.Length, (float)resistorRow.Width);
            float orientation = 360 - (float)resistorRow.Orientation;
            PointF center = new PointF((float)resistorRow.CenterX, (float)resistorRow.CenterY);
            PointF[] points = CreatePolygon(rec, center, orientation);
            if (!Double.IsNaN(resistorRow.HiX) && !Double.IsNaN(resistorRow.HiY))
            {
                g.FillEllipse(myBrush, (float)resistorRow.HiX - 5 , (float)resistorRow.HiY - 5, 10, 10);
                g.DrawLine(p, new PointF((float)resistorRow.HiX, (float)resistorRow.HiY), center);
            }
            g.FillPolygon(myBrush, points);
        }
    }

可以提供示例代码.非常感谢

J.P

Answer 1

这是一种通过缩放Graphics对象来缩放绘图的方法:

private void panel1_Paint(object sender, PaintEventArgs e)
{
    Graphics g = e.Graphics;
    g.ScaleTransform(zoom, zoom);

    // some demo drawing:
    Rectangle rect = panel1.ClientRectangle;
    g.DrawEllipse(Pens.Firebrick, rect);
    using (Pen pen = new Pen(Color.DarkBlue, 4f)) g.DrawLine(pen, 22, 22, 88, 88);

}

这里我们存储缩放级别:

float zoom = 1f;

在这里我们设置它并更新Panel:

private void trackBar1_Scroll(object sender, EventArgs e)
{
   // for zooming between, say 5% - 500%
   // let the value go from 50-50000, and initialize to 100 !
    zoom = trackBar1.Value / 100f;  
    panel1.Invalidate();
}

两个示例屏幕截图:

请注意,这也很好地缩放了笔的宽度.打开抗锯齿将是一个好主意..:g.SmoothingMode = SmoothingMode.AntiAlias;