How do I change color of a text in a given subplot?

I have a given figure which contains 2 subplots. the first subplot has a text on it. I want to change the text color and size using set/get parent/children commands... I already have the handle to the line in the top subplot(which is the first subplot as well). how can I do that? Is 'text' a parent or a child off the line in the top figure?

[Image Analyst]

Please attach the fig file if you can.

Answer 1

[sixwwwwww]

you can change text color as follow:

x = -pi:.1:pi;
y = sin(x);
plot(x,y)
text(-pi/4, sin(-pi/4), '\leftarrow sin(-\pi\div4)', 'HorizontalAlignment','left', 'Color', 'r')

Or if you wanted to use set command then you can do it as follow:

h = text(-pi/4, sin(-pi/4), '\leftarrow sin(-\pi\div4)', 'HorizontalAlignment','left');
set(h, 'Color',[1, 0 ,0])

[ilona]

it doesn't work since I don't know the equation that created the text(someone already gave me a figure and I am not allowed to look in the function they wrote just to call it from mine... I must use parent/children and only change the color and the font size, is it possible?

[sixwwwwww]

Iy you already have handler 'h' for object whose color and font property you want to set then use:

set(h, 'Color',[1, 0 ,0], 'FontSize', 20)

Which text you want to change in that figure? Is it title or xlabel or ylabel?

Also in order to find some specific object in figure you can use 'findobj'. See for more information:

http://www.mathworks.com/help/matlab/ref/findobj.html

[ilona]

there is just a text in the middle of the 1st graph... its not a title or axis lable! and I only have the handle to the line in the top subplot so I need to find the handle for the text object(also located in the top subplot) and change it, this is my main problam actually... I don't now even if a text object is a child/parent... and how to access its handle

thank you for your help :)

Answer 2

[Johannes Hougaard]

Every text in a figure has a handle which has a 'Color' property you can set individually for each of them or for all of them in one go

The easiest way to detect if something is a text is to check whether it contains a string. So I'd do it something like this to set them all in one go

figure; 
subplot(2,1,1)
plot(1:999,sin(linspace(-8*pi,12*pi,999)));
text(200,0,"This is a text in subplot 1");
xlabel("X-axis 1")
ylabel("Y-axis 1")
subplot(2,1,2)
plot(1:999,cos(linspace(-4*pi,4*pi,999)));
text(200,0,"This is a text in subplot 2");
xlabel("X-axis 2")
ylabel("Y-axis 2")

all_handles = findall(gcf);
set(all_handles(isprop(all_handles,'String')),'Color',"#F76806");

And if you want to set them one by one you just go in a for loop or look for a specific string

e.g.

figure; 
subplot(2,1,1)
plot(1:999,sin(linspace(-8*pi,12*pi,999)));
text(200,0,"This is a text in subplot 1");
xlabel("X-axis 1")
ylabel("Y-axis 1")
subplot(2,1,2)
plot(1:999,cos(linspace(-4*pi,4*pi,999)));
text(200,0,"This is a text in subplot 2");
xlabel("X-axis 2")
ylabel("Y-axis 2")

all_handles = findall(gcf);
string_handles = all_handles(isprop(all_handles,'String'));
subplot2text = contains({string_handles.String},"subplot 2");
set(string_handles(subplot2text),'Color',"#FD5E53");