I'm writing a program with a graph. You have to select
> segments of the graph, which requires 2 points.
> working with widgets is new to me and im used to working
> with while loops and what not. I've been just checking to
> see if i have 0 or 1 points in the on_point wxmpl code, and
> then if i have 1 and the next point is good opening a
> dialog to ask and then resetting number of pionts to 0.
> anyone have any better ideas of how to do this? the amount
> of "global"/"self.points" variables is driving me nuts
If you want to select a horizontal or vertical region of the graph,
eg, xmin, xmax, the SpanSelector widget is your friend. I believe
recent versions of the wxmpl code worth with mpl events and widgets,
but I haven't tested this.
The SpanSelector is a mouse widget to select a vmin/vmax
range. When you left click drag in the axes, a rectangle shows the
selected region. When you release, the rectangle disappears and a
callback is called with min/max.
from matplotlib.widgets import SpanSelector
fig = pylab.figure(figsize=(8,6))
ax = fig.add_subplot(211, axisbg='#FFFFCC')
x,y = 4*(pylab.rand(2,100)-.5)
ax.set_title('Press left mouse button and drag to test')
def onselect(vmin, vmax):
print vmin, vmax
# set useblit True on gtkagg for enhanced performance
span = SpanSelector(ax, onselect, 'horizontal', useblit=False,
rectprops=dict(alpha=0.5, facecolor='red') )
ax2 = fig.add_subplot(212)
span2 = SpanSelector(ax2, onselect, 'vertical')