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Tag Archives: ellipse
Use sines and cosines to draw circles and ellipses in C#
This example shows how you can use trigonometric functions to draw circles. It’s such a basic technique that I often forget that it’s not completely obvious to everyone. Given a radius R and an angle θ, the equations x = … Continue reading
Posted in drawing, graphics, mathematics
Tagged C#, C# programming, circle, draw circles, drawing, ellipse, example, example program, graphics, mathematics, Windows Forms programming
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Calculate where a line segment and an ellipse intersect in C#
Finding the intersection between a line segment and an ellipse requires a lot of mathematics. It’s not particularly hard mathematics, but if you’d rather skip it, you can use the following links to jump to the other parts of this … Continue reading
Posted in algorithms, drawing, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, drawing, ellipse, ellipse line intersection, ellipse/line intersection, example, example program, geometry, graphics, intersection, line, line ellipse intersection, line segment, line/ellipse intersection, mathematics, Windows Forms programming
6 Comments
Determine which pie slice is under the mouse in C#
When the program starts, the following code initializes the pie chart’s parameters. // The pie chart’s center. private Point EllipseCenter; // The pie chart’s drawing area. private Rectangle EllipseRect; // The ellipse’s X and Y radii. private float EllipseRx, EllipseRy; … Continue reading
Let the user draw rubber band ellipses (or other shapes) in C#
The following code shows how the program lets the user draw rubber band ellipses. // The ellipses to draw. private List<Rectangle> Ellipses = new List<Rectangle>(); // The points for the new ellipse we are drawing. private Point StartPoint, EndPoint; private … Continue reading
Posted in drawing, graphics
Tagged C#, C# programming, draw ellipse, ellipse, example, example program, graphics, rubber band, rubberband, Windows Forms programming
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Render an ellipse in a WPF program using C#
This example shows how you can render an ellipse in a WPF program. Normally to draw shapes in WPF you use some sort of object. You can add Ellipse, Line, Path, Polygon, Polyline, and Rectangle objects to a window and … Continue reading
Posted in drawing, geometry, graphics, wpf, XAML
Tagged C#, C# programming, drawing, ellipse, example, example program, geometry, graphics, OnRender, render, rendering, Windows Forms programming, WPF, XAML
2 Comments
Draw on a bitmap in C#
This example shows how you can draw on a bitmap and display the result on a form. The example Draw in a Paint event handler in C# shows how to draw in a form’s Paint event handler. This is simple, … Continue reading
Posted in drawing, graphics
Tagged Bitmap, C#, C# programming, drawing, ellipse, example, example program, graphics, smooth drawing, smoothing, smoothing mode, Windows Forms programming
4 Comments
Draw in a Paint event handler in C#
Using images and drawing in the Paint event handler are the two most common ways to display graphics. Drawing in the Paint event handler is easy, but there are a couple of things you should keep in mind when you … Continue reading
Posted in drawing, graphics
Tagged C#, C# programming, drawing, ellipse, example, example program, graphics, Paint event handler, smooth drawing, smoothing, smoothing mode, Windows Forms programming
22 Comments
See where a line intersects a conic section in C#
This example shows how you can see where a line intersects a conic section. You can use the more general method described in the post See where two conic sections intersect in C#. This example takes advantage of the simpler … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section intersection, conic sections, ellipse, example, example program, geometry, graphics, intersection, line intersection, line segments, lines, mathematics, Windows Forms programming
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See where two conic sections intersect in C#
This example uses techniques demonstrated in several earlier posts to let you see where two conic sections intersect. To use the example, click the left mouse button five times each to select one conic section> Then click the right mouse … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section, draw conic section, draw curve, draw ellipse, draw hyperbola, draw parabola, ellipse, equation, example, example program, geometry, graph equation, graphics, hyperbola, intersections, mathematics, parabola, points of intersection, Windows Forms programming
1 Comment
Select a conic section in C#
This example shows how you can let the user click five points to select a conic section. Recall that the equation for a conic section is: If you know the coordinates of some points on a conic section, then you … Continue reading
Posted in algorithms, geometry, graphics, mathematics
Tagged algorithms, C#, C# programming, conic section, draw conic section, draw curve, draw ellipse, draw hyperbola, draw parabola, ellipse, equation, example, example program, geometry, graph equation, graphics, hyperbola, mathematics, parabola, select conic section, select curve, Windows Forms programming
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