Editing Recap of the hierarchy of each plot element
Jump to navigation
Jump to search
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 1: | Line 1: | ||
Octave aims at being compatible with Matlab as much as possible, so the graphics part is very similar too to Matlab. In Octave the first choice to make is the {{Codeline|graphics_toolkit ()}}. | First of all, Octave aims at being compatible with Matlab (TM) as much as possible, so the graphics part is very similar too to Matlab. In Octave the first choice to make is the {{Codeline|graphics_toolkit()}}. Standard is the 'gnuplot' toolkit using the [http://www.gnuplot.info Gnuplot] software package . The second choice is 'fltk' [http://www.fltk.org fltk]. You might want to try to test both of them for your plotting aims to see which solves your problem. | ||
You might want to try to test | |||
After the choice of the {{Codeline|graphics_toolkit('gnuplot')}} or {{Codeline|graphics_toolkit('fltk')}}, there is the following hierarchy to address when make/adapting your plot: | |||
* root | * root (any hierarchy needs to start somewhere) | ||
* figure: | * gcf() (the handle to your figure: one for every figure) | ||
* | * gca() (the handle to the axes inside a particular figure (several if you have subplots) | ||
* p=plot(x,y) (p is the handle (inside the current axes handle) to the data, data symbols, data line thickness, etc) | |||
* | |||
Let's do an example: | |||
graphics_toolkit('gnuplot'); | |||
x=0:0.1:3; | |||
y=sin(x); | |||
p=plot(x,y,'b'); | |||
This should get you a plot of a part of a sine wave. Octave has used all standard properties like line widths, fonts, etc, except for the line color which was forced to be blue (via the {{Codeline|'b'}}). | This should get you a plot of a part of a sine wave. Octave has used all standard properties like line widths, fonts, etc, except for the line color which was forced to be blue (via the {{Codeline|'b'}}). | ||
Line 32: | Line 19: | ||
Before going into the hierarchy and how to change things, let's make things more complicated: | Before going into the hierarchy and how to change things, let's make things more complicated: | ||
graphics_toolkit ( | graphics_toolkit('gnuplot'); | ||
figure (1) | figure(1) | ||
x = 0:0.1:3; | x=0:0.1:3; | ||
y = sin (x); | y=sin(x); | ||
p = plot (x, y, | p=plot(x,y,'b'); | ||
figure (2) | figure(2) | ||
subplot (2, 1, 1); | subplot(2,1,1); | ||
r = plot (x, y.^2, | r=plot(x,y.^2,'og'); | ||
subplot (2, 1, 2); | subplot(2,1,2); | ||
q = plot (x, x.^2, | q=plot(x,x.^2,'k'); | ||
* You now have 2 windows that popped up on your screen: figure1 and figure2. | |||
* figure2 has 2 axes objects inside: a 'y=(sin(x))^2' and a 'y=x^2' | |||
* the actual data and data-plot-properties are inside the handles {{Codeline|p}} and {{Codeline|r}}. | |||
So let's say you want to change the line thickness of the data in the first figure: | |||
figure(1) | |||
figure (1) | set(p,'linewidth',3) | ||
set (p, | |||
You can get the color of the two other plots by referring to their handles: | You can get the color of the two other plots by referring to their handles: | ||
get (q, | get(q,'color') | ||
get (r, | get(r,'color') | ||
Which will give you the RGB code for black (0,0,0) and green (0,1,0). | Which will give you the RGB code for black (0,0,0) and green (0,1,0). | ||
Have a look at all the | Have a look at all the things you can change with: | ||
get | get(q) | ||
And {{Codeline|set}} anything that is not to your taste to something else (for what's available see the [http://www.gnu.org/software/octave/doc/interpreter/ manual]). | And {{Codeline|set}} anything that is not to your taste to something else (for what's available see the [http://www.gnu.org/software/octave/doc/interpreter/ manual]). | ||
set (p, | set(p,'marker','*') | ||
Adding {{Codeline|text()}} inside an {{Codeline|axes()}} object is done by | Adding {{Codeline|text()}} inside an {{Codeline|axes()}} object is done by | ||
text (2, 0.8, | text(2,0.8,'HERE'); | ||
... but it now | ... but it now inserted in figure1, which ''might NOT be want you anticipated''. | ||
The {{Codeline|text()}} command does ''not'' have the option to tell it in which figure or axes object to write the text. | |||
Make sure you have moved current figure and axes ''before'' calling {{Codeline|text()}} to insert text: | |||
figure(2) | |||
get(gcf(),'children') % which two axes objects are there inside figure(2) | |||
set(gcf(),'currentaxes',(get(gcf(),'children'))(2)) % chose the second one | |||
figure (2 | text(1.0,0.5,'THIS IS WHAT I WANTED') | ||
set (gcf (), | |||
text (1.0, 0.5, | |||
text(1,0.5,"This is where I wanted my text"); |