I want to plot a transparent triangle

I have the coordinates for the triangle, and I want to plot a triangle. I have been doing like this.

W = 0.5;

L = 0.3;

Patch = [-0.3, -W/2; -0.3, W/2; L, 0];

triangle_local = Patch;

triangle_handle = fill(triangle_local(:, 1), triangle_local(:, 2),'green');

With the above command, I am getting a triangle filled with green color. I want to get a transparent triangle, because I want to plot a point inside the triangle. How can I get a transparent triangle?

Answer 1

[Dyuman Joshi]

Use the color 'white'

W = 0.5;
L = 0.3;
Patch = [-0.3, -W/2; -0.3, W/2; L, 0];
triangle_local = Patch;
triangle_handle = fill(triangle_local(:, 1), triangle_local(:, 2),'white');

[Dyuman Joshi]

or set 'FaceColor' to 'none' for any color -

W = 0.5;
L = 0.3;
Patch = [-0.3, -W/2; -0.3, W/2; L, 0];
triangle_handle = fill(Patch(:, 1), Patch(:, 2),'green','FaceColor','none');

Answer 2

[Bruno Luong]

Semi transparent, set FaceAlpha from 0 (100%transparent) to 1 (opaque)

W = 0.5;
L = 0.3;
Patch = [-0.3, -W/2; -0.3, W/2; L, 0];
plot3([0 0], 0.3*[-1 1], -0.1+[0 0], 'k', 'Linewidth', 2)
hold on
fill(Patch(:, 1), Patch(:, 2),'green','FaceAlpha',0.2)
axis equal