In my previous article, I have given you an overview of our .NET Graphics API - Aspose.Drawing for .NET. Along with that, we have seen how to create images from scratch or draw graphics on existing images using C#. In this article, we’ll go one step ahead and learn how to create 2D drawings by drawing various graphical objects within the .NET applications such as ASP.NET web application, Windows application, and etc.
The following are the vector graphics that we are going to draw within our drawings using .NET Graphics API.
- Create a Drawing using C#
- Draw an Arc in the Drawing
- Draw a Bezier Spline in a Drawing
- Draw a Cardinal Spline in a Drawing
- Draw a Closed Curve in a Drawing
- Draw an Ellipse in a Drawing
- Draw Lines in a Drawing
- Draw a Path in a Drawing
- Draw a Polygon in a Drawing
- Draw Rectangle in a Drawing
Before we start, make sure you have installed Aspose.Drawing for .NET within your .NET application. You can read about the installation methods in this post.
Create a Drawing from Scratch using C#
First of all, let’s have a look at how to create an empty drawing and save it as a PNG image. The steps are as simple as pie.
- Create a new Bitmap object.
- Save the drawing in PNG format using Bitmap.Save(string) method.
You can save the drawing in other image formats as well. The following code sample shows how to create a drawing from scratch using C#.
Draw an Arc in Drawing using C#
Let’s check out how to draw an arc within the drawing. The following are the steps to perform this operation.
- Define an instance of the Bitmap class.
- Initialize an object of Graphics class from the Bitmap object.
- Create a Pen object to draw the arc with.
- Use Graphics.DrawArc(Pen, Single, Single, Single, Single, Single, Single) method to draw an arc.
- Save the drawing as an image using Bitmap.Save(string) method.
The following code sample shows how to draw an arc in the drawing using C#.
Draw a Bezier Spline in Drawing using C#
The following are the steps to draw a bezier spline within a drawing.
- Create an object of the Bitmap class.
- Initialize an object of Graphics class from the Bitmap object.
- Create a Pen object to draw the graphics.
- Use Graphics.DrawBezier(Pen, PointF, PointF, PointF, PointF) method to draw Bezier Spline.
- Save the drawing using Bitmap.Save(string) method.
The following code sample creates a Bezier Spline using C#.
Add a Cardinal Spline in Drawing using C#
Use the following steps to draw a cardinal spline using our .NET Graphics API.
- Instantiate an object of the Bitmap class.
- Create an object of Graphics class from the Bitmap object.
- Create a Pen object for drawing.
- Draw cardinal spline using Graphics.DrawCurve(Pen,Point[]) method.
- Save the drawing as an image using Bitmap.Save(string) method.
The following C# code sample draws a cardinal spline using Aspose.Drawing for .NET.
Add a Closed Curve in Drawing using C#
You can also draw a closed curve in the same way you have drawn the other graphical objects. The following are the steps for this.
- Instantiate a Bitmap object.
- Create an object of Graphics class and initialize it from the Bitmap object.
- Create a Pen object for drawing the closed curve.
- Draw a closed curve using Graphics.DrawClosedCurve(Pen,Point[]) method.
- Save the drawing using Bitmap.Save(string) method.
You can draw a closed curve using the following C# code sample.
Draw an Ellipse in a Drawing using C#
The following are the steps to draw an ellipse in a drawing using Aspose.Drawing for .NET.
- Create an instance of the Bitmap class.
- Define an instance of the Graphics class and initialize it from the Bitmap object.
- Use a Pen object to draw the ellipse.
- Draw an ellipse using Graphics.DrawEllipse(Pen, Single, Single, Single, Single) method.
- Save the drawing as an image using Bitmap.Save(string) method.
The following code sample shows how to draw an ellipse using C#.
Draw Lines in a Drawing using C#
Lines are one of the basic objects for creating the drawings. The following are the steps to draw the lines in a drawing using Aspose’ Graphics API.
- Instantiate the Bitmap object.
- Create a new Graphics object and initialize it from the Bitmap object.
- Define a Pen object to draw the line.
- Draw a line using Graphics.DrawLine(Pen, Int32, Int32, Int32, Int32) method.
- Save the drawing using Bitmap.Save(string) method.
The following code sample shows how to draw lines within a drawing using C#.
Draw a Path in the Drawing using C#
The following are the steps to draw a path within a drawing using C#.
- Instantiate the Bitmap object.
- Create an object of Graphics class and initialize it from the Bitmap object.
- Define a Pen object to draw the path.
- Create an instance of GraphicsPath class.
- Add graphics to the path collection.
- Draw the path using Graphics.DrawPath(Pen, GraphicsPath) method.
- Save the drawing using Bitmap.Save(string) method.
The following code sample shows how to draw a path within a drawing using C#.
Draw a Polygon in a Drawing using C#
The following are the steps to draw a polygon within a drawing using Aspose.Drawing for .NET.
- Instantiate the Bitmap object.
- Define a Graphics object and initialize it from the Bitmap object.
- Define a Pen object to draw the polygon.
- Draw a polygon using Graphics.DrawPolygon(Pen,Point[]) method.
- Save the drawing using Bitmap.Save(string) method.
This is how you can draw a polygon within a drawing using C#.
Draw a Rectangle within the Drawing using C#
Last but not the least, drawing a rectangle. The following are the steps to draw a rectangle.
- Create a Bitmap object.
- Create a Graphics object and initialize it from the Bitmap object.
- Define a Pen object to draw the rectangle.
- Draw a rectangle using Graphics.DrawRectangle(Pen, Int32, Int32, Int32, Int32) method.
- Save the drawing using Bitmap.Save(string) method.
The following C# code sample draws a rectangle within a drawing.
Conclusion
In this article, we have seen how various graphical objects can be drawn within a drawing programmatically using C#. The step by step guide and code samples demonstrated how to draw lines, rectangles, polygons, arcs, bezier spline, cardinal spline, curves and ellipses within the drawings. You can learn more about our .NET Graphics API using the documentation.