Head over to views.py, where we'll create the LineChartView class:
class LineChartView(tk.Canvas):
margin = 20
def __init__(self, parent, chart_width, chart_height,
x_axis, y_axis, x_max, y_max):
self.max_x = max_x
self.max_y = max_y
self.chart_width = chart_width
self.chart_height = chart_height
LineChartView is a subclass of Canvas, so we'll be able to draw items directly on it. We'll accept a parent widget, height, and width for the chart portion, labels for the x and y axes as arguments, and the maximum values for x and y to display. We'll save the chart dimensions and maximum values for later use, and set a class property of 20 pixels for the margin width.
Let's start setting up this Canvas:
view_width = chart_width ...
