how to drawing with c#

If you want to draw simple and fixed shapes (like: lines, rectangle, ellipse, etc.) using .NET WinForms classes, you can try using the System.Drawing.Graphics class with methods like DrawRectangle, DrawPolygon, DrawLines, etc.
You can find more details here:
https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics?view=netframework-4.7.2

However, if you are looking for more advanced shapes including measuring specialized objects (like Ruler, Poly-Rulers, Rectangle, Text, Highlight, etc.) that can be edited by user dynamically at runtime, you can try the Annotations objects and functions from LEADTOOLS .NET SDK. Note that these objects are drawn on a different layer over the image. Also they can be realized to the image to become part of the its' pixel data.

For example, the following code shows how you can create a line and Ruler .NET objects at runtime:

// assumes _automation is valid
// Create Line object
AnnPolylineObject polyline = new AnnPolylineObject();
polyline.Points.Add(container.Mapper.PointToContainerCoordinates(new LeadPointD(100, 100)));
polyline.Points.Add(container.Mapper.PointToContainerCoordinates(new LeadPointD(300, 100)));
polyline.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("blue"), LeadLengthD.Create(2.0));
_automation.Container.Children.Add(polyline);
//Create Ruler object
double inch = 720.0;
AnnPolyRulerObject polyRulerObj = new AnnPolyRulerObject();
polyRulerObj.Points.Add(LeadPointD.Create(1 * inch, 1 * inch));
polyRulerObj.Points.Add(LeadPointD.Create(2 * inch, 2 * inch));
polyRulerObj.Points.Add(LeadPointD.Create(1 * inch, 5 * inch));
// Set the stroke
polyRulerObj.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("Red"), LeadLengthD.Create(2));
// Add the object to the automation container
_automation.Container.Children.Add(polyRulerObj);

More details can be found here:
https://www.leadtools.com/help/leadtools/v20/dh/to/implementing-annotations.html

4 Replies

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Maen Badwan7y ago
Accepted answer
If you want to draw simple and fixed shapes (like: lines, rectangle, ellipse, etc.) using .NET WinForms classes, you can try using the System.Drawing.Graphics class with methods like DrawRectangle, DrawPolygon, DrawLines, etc.
You can find more details here:
https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics?view=netframework-4.7.2

However, if you are looking for more advanced shapes including measuring specialized objects (like Ruler, Poly-Rulers, Rectangle, Text, Highlight, etc.) that can be edited by user dynamically at runtime, you can try the Annotations objects and functions from LEADTOOLS .NET SDK. Note that these objects are drawn on a different layer over the image. Also they can be realized to the image to become part of the its' pixel data.
For example, the following code shows how you can create a line and Ruler .NET objects at runtime:
// assumes _automation is valid
// Create Line object
AnnPolylineObject polyline = new AnnPolylineObject();
polyline.Points.Add(container.Mapper.PointToContainerCoordinates(new LeadPointD(100, 100)));
polyline.Points.Add(container.Mapper.PointToContainerCoordinates(new LeadPointD(300, 100)));
polyline.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("blue"), LeadLengthD.Create(2.0));
_automation.Container.Children.Add(polyline);

//Create Ruler object
double inch = 720.0;
AnnPolyRulerObject polyRulerObj = new AnnPolyRulerObject();
polyRulerObj.Points.Add(LeadPointD.Create(1 * inch, 1 * inch));
polyRulerObj.Points.Add(LeadPointD.Create(2 * inch, 2 * inch));
polyRulerObj.Points.Add(LeadPointD.Create(1 * inch, 5 * inch));
// Set the stroke
polyRulerObj.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("Red"), LeadLengthD.Create(2));
// Add the object to the automation container
_automation.Container.Children.Add(polyRulerObj);
More details can be found here:
https://www.leadtools.com/help/leadtools/v20/dh/to/implementing-annotations.html
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Mageshwaran R6y ago
Hi,
please refer this link:
https://www.c-sharpcorner.com/UploadFile/mahesh/drawing-lines-in-gdi/
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umut celik7y ago

Thank you for your interest.

I'll take care of what you say

Jignesh Kumar7y ago
Please find below vedio which will help you to start with drowning.

https://www.youtube.com/watch?v=PRpYDTegGyo
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