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Snapping Tile Renderer User Defined Model
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from bokeh.plotting import figure, output_file, show | |
from bokeh.models.renderers import TileRenderer | |
from bokeh.tile_providers import STAMEN_TONER | |
from bokeh.models import Range1d | |
output_file('snap_tiles.html') | |
class SnappingTileRenderer(TileRenderer): | |
__implementation__ = """ | |
_ = require "underscore" | |
$ = require "jquery" | |
Util = require "util/util" | |
TileRenderer = require "renderer/tile/tile_renderer" | |
class SnappingTileRendererView extends TileRenderer.View | |
type: "SnappingTileRendererView" | |
_set_data: () -> | |
super | |
@plot_view.$el.dblclick(@on_double_click) | |
on_double_click: (e) => | |
extent = @get_extent() | |
[xmin, ymin, xmax, ymax] = extent | |
center_x = (xmax - xmin) / 2 | |
center_y = (ymax - ymin) / 2 | |
x_percent = .5 | |
y_percent = .5 | |
zoom_level = @mget('tile_source').get_closest_level_by_extent(extent, @map_frame.get('height'), @map_frame.get('width')) | |
if e.shiftKey | |
zoom_level = zoom_level - 1 | |
else | |
zoom_level = zoom_level + 1 | |
new_resolution = @mget('tile_source').get_resolution(zoom_level) | |
new_xrange = new_resolution * @map_frame.get('width') | |
new_yrange = new_resolution * @map_frame.get('height') | |
nxmin = center_x - (x_percent * new_xrange) | |
nymin = center_y - (y_percent * new_yrange) | |
nxmax = xmin + new_xrange | |
nymax = ymin + new_yrange | |
new_extent = @mget('tile_source').snap_to_zoom([nxmin, nymin, nxmax, nymax], @map_frame.get('height'), @map_frame.get('width'), zoom_level) | |
@x_range.set('start', new_extent[0]) | |
@y_range.set('start', new_extent[1]) | |
@x_range.set('end', new_extent[2]) | |
@y_range.set('end', new_extent[3]) | |
class SnappingTileRenderer extends TileRenderer.Model | |
default_view: SnappingTileRendererView | |
type: 'SnappingTileRenderer' | |
module.exports = | |
Model: SnappingTileRenderer | |
View: SnappingTileRendererView | |
""" | |
def create_plot(): | |
axis_range = [-20000000, 20000000] | |
x_range = Range1d(*axis_range) | |
y_range = Range1d(*axis_range) | |
p = figure(tools='pan,wheel_zoom', x_range=x_range, y_range=y_range, plot_height=800, plot_width=800) | |
p.axis.visible = False | |
p.renderers.append(SnappingTileRenderer(tile_source=STAMEN_TONER)) | |
return p | |
p = create_plot() | |
show(p) |
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