Chapter 13: Problem 21

How is the canvas widget's screen coordinate system different from the Cartesian coordinate system used by the turtle graphics library?

Short Answer

Expert verified

The main differences between the canvas widget's screen coordinate system and the Cartesian coordinate system used by the turtle graphics library are the origin points and the Y-axis orientation. In the canvas widget's system, the origin (0,0) is located at the top-left corner of the screen, with positive Y values extending downwards. On the other hand, in the turtle graphics library, the origin (0,0) is at the center of the screen, with positive Y values extending upwards.

Step by step solution

Describe the canvas widget's screen coordinate system

The canvas widget's screen coordinate system is used in graphical applications to position elements (like shapes, text, images, etc.) on the screen. In this system, the origin (0,0) is located in the top-left corner of the screen or the canvas area. As we move towards the right side of the screen, the X-coordinate increases, and as we move towards the bottom side of the screen, the Y-coordinate increases. Essentially, the X-axis extends horizontally, and the Y-axis extends vertically downwards.

Describe the Cartesian coordinate system used by the turtle graphics library

The Cartesian coordinate system used by the turtle graphics library is also based on X and Y-axis; however, the origin (0,0) is located at the center of the screen (or the turtle window). The X-axis extends horizontally, with positive values towards the right and negative values towards the left. The Y-axis in this system extends vertically, with positive values upwards and negative values downwards. In this way, the turtle graphics library uses a more traditional Cartesian coordinate system.

Identify the differences between the two coordinate systems

There are two primary differences between the canvas widget's screen coordinate system and the Cartesian coordinate system used by the turtle graphics library: 1. Origin point: In the canvas widget's screen coordinate system, the origin (0,0) is located at the top-left corner of the screen, while in the turtle graphics Cartesian coordinate system, the origin (0,0) is at the center of the screen. 2. Y-axis orientation: The Y-axis in the canvas widget's screen coordinate system has positive values extending downwards, while the Y-axis in the Cartesian coordinate system used by the turtle graphics library has positive values extending upwards.

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How is the canvas widget's screen coordinate system different from the Cartesian coordinate system used by the turtle graphics library?

Short Answer

Step by step solution

Describe the canvas widget's screen coordinate system

Describe the Cartesian coordinate system used by the turtle graphics library

Identify the differences between the two coordinate systems

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