""" Render a graph on a QPainter. """

import contextlib

from ..qtapi import QtGui, QtCore, Qt

from ...chart import Chart

from ...utils import bench_it, clip

from ...tsdb.metrics import Metrics

from .layout import ChartLayout

from .chart import ChartRenderer

from .options import ChartOptions

class Renderer:

""" Render a chart.

Optionally include a minimap?

"""

def __init__(

self, painter: QtGui.QPainter, chart: Chart, layout: ChartLayout, options

):

self.painter = painter

self.chart = chart

self.layout = layout

self.options = options

def render(self):

chart_renderer = ChartRenderer(

self.painter, self.chart, self.layout, self.options

)

chart_renderer.render()

# self.render_minimap(rect)

def render_minimap(self, rect: QtCore.QRect):

""" Render a minimap in the top corner, with an overview where the viewport is. """

# Create a new chart with the whole thing zoomed

minimap_chart = Chart(self.chart.db)

for curve in self.chart.curves:

minimap_chart.add_curve(curve.name, curve.color)

minimap_chart.zoom_fit()

# Now render minimap in top left corner.

minimap_options = ChartOptions()

minimap_options.padding = 2

minimap_options.show_axis = False

minimap_rect = QtCore.QRect(rect.x() + 40, rect.y() + 40, 120, 80)

minimap_layout = ChartLayout(minimap_rect, minimap_options)

self.painter.fillRect(minimap_rect, Qt.yellow)

minimap_chart_renderer = ChartRenderer(

self.painter, minimap_chart, minimap_layout, minimap_options

)

minimap_chart_renderer.render()

region = self.chart.get_region()

minimap_chart_renderer.shade_region(region)