I have a Form that contain a panel, and in this panel I draw shapes, like rectangles and circles, I need to zoom into this shapes, I saw couple options but most of them using PictureBox. Should I use Bitmap creating the panel area as a bitmap and change the zooming factor ?? would this help me also further if I want to have Panning and not draw images not into the fit in the panel size.
Here is a snapshot of my code
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);
}
}
Can a sample code be provided. Many Thanks
Jp
Here is a way to scale the drawing by scaling the Graphics object:
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);
}
Here we store the zoom level:
float zoom = 1f;
Here we set it and update the 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();
}
Two example screenshots:
Note how nicely this scales the Pen widths as well. Turning on antialiasing would be a good idea..: g.SmoothingMode = SmoothingMode.AntiAlias;
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