[Scilab-users] Interactive zoom on plot with multiple axes

[DominicErnst]

Dear all,

I have successfully created a plot with two y-axes (left / right), including
some customization on axis labeling as well as legends. Now, if I try to
interactively zoom the plot, only the last active axis is zoom-able. I tried
to activate the other axis by issuing the gca(handle) command, but it did
not change anything.

Source:
t = linspace(0,10,1000);

P = 0.5*t;
alpha = 2.5*sin(0.2*t);

// Processed raw data figure
f_proc = scf(2);
f_proc.figure_name = "Processed raw Values";
f_proc.color_map = [get(sdf(),"color_map");[0,0.5,0]]; // add dark-green at
end of default color table
clf(f_proc);

plot(t,alpha,'b');  //first plot alpha blue
plot(t,P);          //dummy plot -> only for working legend

ax_Ang = gca();

ax_Ang.axes_visible = ['off','on','off'];       // hide 2nd x-axis
ax_Ang.y_location = 'left';                     // alpha axis left
ax_Ang.children.children(1).foreground = 33;    // assign green to dummy
plot -> correct display in legend
ax_Ang.children.children(1).visible = 'off';    // hide dummy plot
ax_Ang.filled = 'off';                          // no background for this
plot
ax_Ang.tight_limits = 'on';
ax_Ang.auto_scale = 'off';
ax_Ang.data_bounds = [min(t),min(alpha);max(t),max(alpha)]; // i dont quite
get why this line is necessary, since tight_limits is on
ax_Ang.font_size = 2;

ticks = ax_Ang.y_ticks;                                     // change y-axis
ticks to readable display
ticks.locations = [0;%pi/4;%pi/2;3*%pi/4;%pi;5*%pi/4];
ticks.labels =
['$0$';'$\frac{\pi}{4}$';'$\frac{\pi}{2}$';'$\frac{3\pi}{4}$';'$\pi$';'$\frac{5\pi}{4}$'];
ax_Ang.y_ticks = ticks;

ax_Y = newaxes();                               // create secondary axis
plot(t,P);                                      // plot second plot

ax_Y.axes_visible = ['on','on','off'];          // show x and y-axis
ax_Y.y_location = 'right';                      // y-axis right
ax_Y.children.children.foreground = ax_Ang.children.children(1).foreground;
// apply previously defined colors
ax_Y.filled = ax_Ang.filled;                                               
// apply previously defined background
ax_Y.tight_limits = ax_Ang.tight_limits;
ax_Y.font_size = ax_Ang.font_size;

title('Angle and Position vs Time','font_size',3);

xlabel(ax_Y,'Time [ms]','font_size',2);
ylabel(ax_Y,'Position [mm]','font_size',2);
ylabel(ax_Ang,'Angle [-]','font_size',2);
legend(ax_Ang,['Angle','Position']);

Has anyone some experience with that. Would be a great help to explore my
data a little easier.
Any help is greatly appreciated

Regards

Dominic



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Dominic Ernst

CNC-PLC Software Developer @ Bystronic Laser AG
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