generated from mwc/lab_scatter
79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# scatterplot.py
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# ------------
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# By MWC Contributors
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# Uses lots of helper functions in other modules to draw a scatter plot.
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from turtle import *
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from superturtle.movement import no_delay
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import constants
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from generate_data import generate_data
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from ticks import get_tick_values
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from plotting import (
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prepare_screen,
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draw_x_axis,
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draw_y_axis,
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draw_x_tick,
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draw_y_tick,
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draw_point,
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)
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from transform import (
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maximum,
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minimum,
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bounds,
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clamp,
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ratio,
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scale,
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get_x_values,
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get_y_values,
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)
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def draw_scatterplot(data, size=5, color="black"):
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"Draws a scatter plot, showing the data"
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prepare_screen()
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draw_axes(data)
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draw_points(data, color, size)
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def draw_axes(data):
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"Draws the scatter plot's axes."
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draw_x_axis()
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x_values = get_x_values(data)
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xmin, xmax = bounds(x_values)
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x_ticks = get_tick_values(xmin, xmax)
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for tick in x_ticks:
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screen_x_position = scale(tick, xmin, xmax, 0, constants.PLOT_WIDTH)
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draw_x_tick(screen_x_position, tick)
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draw_y_axis()
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y_values = get_y_values(data)
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ymin, ymax = bounds(y_values)
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y_ticks = get_tick_values(ymin, ymax)
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for tick in y_ticks:
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screen_y_position = scale(tick, ymin, ymax, 0, constants.PLOT_HEIGHT)
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draw_y_tick(screen_y_position, tick)
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def draw_points(data, color, size):
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"Draws the scatter plot's points."
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x_values = get_x_values(data)
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xmin, xmax = bounds(x_values)
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y_values = get_y_values(data)
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ymin, ymax = bounds(y_values)
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for point in data:
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"this will return a list with just one x and y value"
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"we are looking for one value of x and y as an integer."
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"look at how we wrote the get_x_values function, how did we extract the x or y value from the point?"
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x, y = point
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"So close! I have the same trouble with the domain and range."
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"domain is not x and range y as we normally think of it."
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"domain is the input values for this scale - the min and max x or y values"
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"range is the output values for the scatterplot - the min and max that can be displayed on our plot"
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"Look at your constants for the size of your plot. The range min for x values would be 0 and max would be what value in the constants file?"
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scaled_x = scale(x, xmin, xmax, 0, constants.PLOT_WIDTH)
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scaled_y = scale(y, ymin, ymax, 0, constants.PLOT_HEIGHT)
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draw_point(scaled_x, scaled_y, color, size)
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with no_delay():
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data = generate_data(50, 10, 500, 5, 400, 1000)
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draw_scatterplot(data, size=5, color="blue")
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hideturtle()
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done()
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