MATLAB: Patch Multiple Specified Colors

Question

Is there a way to create more than one polygon and fill them with different colors specified by the user? I know that with patch function, there is a way to create random colors for them, and there is a way to create just one color for all the polygons, but I don't know how to specify that, for instance, I want the first polygon to be red and the second to be green. For example:

X = [0 0; 0 0; 4 4];

Y = [0 4; 3 7; 0 4];

C = [.25; .75]

p = patch(X,Y,C)

This creates two triangles, with the triangle on top as yellow and the triangle on the bottom as purple. But how do I make it such that the triangle on top is red, and the triangle on the bottom is green? Ideally, this would be accomplished without a loop?

Long story short: I want to be able to apply conditional formatting to a wide array of values. But it seems cumbersome to do them one color at a time.

Answer 1

The simplest way is probably to define a colormap for the figure.

Try this:

X = [0 0; 0 0; 4 4];
Y = [0 4; 3 7; 0 4];
C = [.25; .75];
colormap([0 1 0; 1 0 0]);
p = patch(X,Y,C);

There are likely a number of differnt ways to do this, depending on the result you want. I encourage you to experiment.