chaco.examples.demo.basic.hittest_tool module

Draws a random x-y lineplot and makes a tool which shows the closet point on the lineplot to the mouse position.

class chaco.examples.demo.basic.hittest_tool.Demo

Bases: traits.has_traits.HasTraits

class chaco.examples.demo.basic.hittest_tool.HittestTool(component=None, **traits)

Bases: enable.base_tool.BaseTool, chaco.abstract_overlay.AbstractOverlay

This tool uses LinePlot.hittest() to get the closest point on the line to the mouse position and to draw it to the screen. Also implements an Overlay in order to draw the point.

normal_mouse_move(event)

overlay(plot, gc, view_bounds=None, mode='normal')

Draws this component overlaid on another component.

chaco.examples.demo.basic.hittest_tool.random_sample(size=None)

Return random floats in the half-open interval [0.0, 1.0).

Results are from the “continuous uniform” distribution over the stated interval. To sample \(Unif[a, b), b > a\) multiply the output of random_sample by (b-a) and add a:

(b - a) * random_sample() + a

Parameters

size (int or tuple of ints, optional) – Output shape. If the given shape is, e.g., (m, n, k), then m * n * k samples are drawn. Default is None, in which case a single value is returned.

Returns

out – Array of random floats of shape size (unless size=None, in which case a single float is returned).

Return type

float or ndarray of floats

Examples

>>> np.random.random_sample()
0.47108547995356098 # random
>>> type(np.random.random_sample())
<class 'float'>
>>> np.random.random_sample((5,))
array([ 0.30220482,  0.86820401,  0.1654503 ,  0.11659149,  0.54323428]) # random

Three-by-two array of random numbers from [-5, 0):

>>> 5 * np.random.random_sample((3, 2)) - 5
array([[-3.99149989, -0.52338984], # random
       [-2.99091858, -0.79479508],
       [-1.23204345, -1.75224494]])