Matplotlib Arrows Tutorial: Creating Directed Lines with Quiz and Flashcards

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Questions and Answers

What happens when you set arrowEnd to True in a Line function?

Does not draw any arrow heads

Draws two arrow heads at both ends of the line

Draws an arrow head at the start of the line

Draws an arrow head at the end of the line (correct)

What is the purpose of the arrowStart property in a Line function?

Draws a line with two arrow heads

Draws a line with an arrow head at the start (correct)

Draws a line with an arrow head at the end

Draws a line with no arrow head

What is the difference between the lines drawn by Line(100, 175, 300, 175, arrowStart=True) and Line(100, 175, 300, 175, arrowEnd=True)?

The direction of the arrow head

The position of the arrow head (correct)

The color of the arrow head

The size of the arrow head

What is the effect of setting both arrowStart and arrowEnd to True in a Line function?

Draws a line with arrow heads at both ends Signup and view all the answers

What is the purpose of the Line function?

To draw a line with optional arrow heads Signup and view all the answers

Which of the following code snippets will draw a line with an arrow head at the start?

Line(100, 175, 300, 175, arrowStart=True) Signup and view all the answers

What is an arc in the context of shapes?

A part of an oval shape Signup and view all the answers

What determines the direction of an arc in a shape?

The startAngle and sweepAngle Signup and view all the answers

What is the unit of measurement for angles in this course?

Degrees Signup and view all the answers

What is the direction of 90 degrees?

To the right Signup and view all the answers

What is the purpose of the first 4 values in the Arc function?

To specify the centerX, centerY, width, and height of the oval Signup and view all the answers

What is the relationship between an arc and an oval?

An arc is part of an oval Signup and view all the answers

What is the most common use of arcs?

To draw a part of a circle Signup and view all the answers

What determines the size of an arc?

The width and height of the arc Signup and view all the answers

What is the purpose of the arrowStart property?

To draw an arrow head at the start of a line Signup and view all the answers

What is the difference between an arc and an arrow?

An arc is a part of a circle, while an arrow is a line with a triangular head Signup and view all the answers

What will draw an arc that looks the same as the arc in the example?

Arc(200, 200, 250, 250, 0, 90, fill='navy') Signup and view all the answers

What do we use to draw an arrow?

A line shape with a triangular head Signup and view all the answers

Study Notes

Arcs and Arrows

Arcs

An arc is a part of an oval.
To draw an arc, we specify the oval it is part of, then the start angle and sweep angle.
The first 4 values in the Arc function specify the centerX, centerY, width, and height of the oval.
The two additional values specify the startAngle and sweepAngle of the arc.
Angles are measured in degrees, with 0 degrees heading straight up, and increasing clockwise.
To make an arc that is part of a circle, we set both its width and height to the diameter of the circle (twice its radius).

Arrows

An arrow is a line with a triangular arrow head at one or both ends.
We use a line and set the arrowStart property to True to draw an arrow head at the start of the line.
We set arrowEnd to True to draw an arrow head at the end of the line.
We can set both arrowStart and arrowEnd to True to draw an arrow head at both ends of the line.

Examples

The code Line(100, 175, 300, 175, arrowStart=True) draws a line with an arrow head at the start.
The code Line(100, 175, 300, 175, arrowEnd=True) draws a line with an arrow head at the end.
The code Arc(200, 200, 400, 150, 0, 90, fill='navy') draws an arc that is part of an oval.

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Description

Learn how to draw lines with arrows in Matplotlib. This quiz covers the usage of arrowStart and arrowEnd parameters to customize line plots. Test your understanding of Matplotlib's line drawing features.