chaco.plots.scatterplot module

Defines the ScatterPlot class, and associated TraitsUI view and helper function.

class chaco.plots.scatterplot.ScatterPlot(**kwtraits)

Bases: chaco.base_xy_plot.BaseXYPlot

Renders a scatter plot, given an index and value arrays.

map_data(screen_pt, all_values=True)

Maps a screen space point into the “index” space of the plot.

Overrides the BaseXYPlot implementation, and always returns an array of (index, value) tuples.

map_index(screen_pt, threshold=0.0, outside_returns_none=True, index_only=False)

Maps a screen space point to an index into the plot’s index array(s).

Overrides the BaseXYPlot implementation..

map_screen(data_array)

Maps an array of data points into screen space and returns it as an array.

Implements the AbstractPlotRenderer interface.

class chaco.plots.scatterplot.ScatterPlotView

Bases: traitsui.view.View

TraitsUI View for customizing a scatter plot.

chaco.plots.scatterplot.render_markers(gc, points, marker, marker_size, color, line_width, outline_color, custom_symbol=None, debug=False, point_mask=None)

Helper function for a PlotComponent instance to render a set of (x,y) points onto a graphics context. Currently, it makes some assumptions about the attributes on the plot object; these may be factored out eventually.

Parameters

• gc (GraphicsContext) – The target for rendering the points

• points (array of (x,y) points) – The points to render

• marker (string, class, or instance) – The type of marker to use for the points

• marker_size (number) – The size of the markers

• color (RGB(A) color) – The color of the markers

• line_width (number) – The width, in pixels, of the marker outline

• outline_color (RGB(A) color) – The color of the marker outline

• custom_symbol (CompiledPath) – If the marker style is ‘custom’, this is the symbol

• point_mask (array of bools) – The mask specifying which points need to be rendered. The points array is already masked