Help with function that plots a specific shape and fills with specific color

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Ali
Ali 2014-2-8
回答： Image Analyst 2014-2-8
Create a MATLAB function called drawShape() that performs the following:
a. Displays a numbered list of shapes as shown below
b. Uses the inbuilt MATLAB function input()to request the user to
i. select a shape from this list, and
ii. a letter to indicate the color to fill the shape (for example: `r’ for red)
You should decide the dimensions of the shapes.
1. Right angled Triangle
2. Circle
3. Square
for example, drawShape(2,g) should plot a green circle.
The only thing I'm struggling with is ,for example, in drawShape(a,b) , how can the function be written for "a" to pull the specific shape plot, and "b" to fill the shape with a specific color.

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回答（2 个）

Walter Roberson
Walter Roberson 2014-2-8
A shape with N sides can be built by taking points 360/N degrees apart on a circle.
When you create a shape, the operation you use will probably have a FaceColor property.
Image Analyst
Image Analyst 2014-2-8
See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
A triangle can be plotted with plot() or line().
A square can be plotted with plot(), line() or rectangle().
For any of them, you can use fill() or patch() to get solid shapes instead of just the perimeter.

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