Category Archives: graphics

Use the predefined Action, Func, and EventHandler delegate types in C#

This and the next couple of posts discuss delegates and the somewhat related topics of anonymous methods and lambda expressions. Briefly, delegate types are programmer-defined data types that represent methods. For example, the following code declares a delegate type. // … Continue reading

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Make a button display the picture beneath slightly grayed it in C#

The example Make a button display the picture beneath it in C# shows how to make a button display the picture that lies below it. Unfortunately, the button only adds a border as decoration and the border doesn’t have a … Continue reading

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Make a button display the picture beneath it in C#

This example makes a button display copies of the picture on which it sits, making it appear that the button is part of the underlying image. The key to this example is the following SetButtonBackground method. // Make the Button … Continue reading

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Draw a picture-filled histogram in C#

The example Make a simple histogram in C# shows how to draw a histogram. This example shows how to fill the histogram’s bars with pictures. The following TileRectangle method fills a rectangle with an image. // Tile an area from … Continue reading

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Make a dice-rolling simulation in C#

This example performs a simulation of rolling two six-sided dice. It’s related to my book Interview Puzzles Dissected, which includes several examples that involve rolling dice. When you enter a number of trials and click Roll, the program uses the … Continue reading

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Tile a PictureBox in C#

If you set a form’s BackgroundImageLayout property Tile, then the control fills itself with copies of its background image. Strangely the PictureBox control does not have a corresponding Tile property. This example shows one way you can tile images on … Continue reading

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Use a symbiote to graphically select hours in C#

This example modifies the previous example Graphically select hours in C# so it uses a symbiote class. That example shows how to use a PictureBox to let the user select a range of hours. If you want to let the … Continue reading

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Graphically select hours in C#

The DateTimePicker control lets you select dates and date ranges, but there’s no standard control that lets you select hours. This example shows one way to do this with a PictureBox. A big part of this program is the DrawHours … Continue reading

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Draw the Weierstrass function in C#

The Weierstrass function was discovered by Karl Weierstrass in 1872. It’s an odd function that is continuous everywhere but differentiable nowhere. I’ll explain what that means shortly. Here’s the function: Here: The following two sections explain what it means to … Continue reading

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Recursively draw equations in C#

The basic idea for recursively drawing equations is simple. Well, sort of simple. Classes represent different kinds of equations. A particular class knows how to draw its kind of equation. It uses other classes to draw its pieces. For example, … Continue reading

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