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Loops to be used in Processing

Loops to be used in Processing

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Loops to be used in Processing 

Exercise 4. Computers do not draw perfect circles. Because there is only a limited number of pixels, a circle in a computer can only be an approximation of a perfect circle. Usually, any smart program does a good job and uses a lot of tricks to make it look good enough that you see it as a perfect circle. At the right, you see a circle approximated by 9 line segments (a 9-sided polygon). As more sides are added, the circle gets smoother. In this exercise you will draw polygons of various sizes, controlled by the mouse, to approximate a circle. Use a radius of 100 (diameter 200) as shown a. First, use a for loop to draw the example given here, with exactly 9 points. The starting point for the first is at angle 0 (straight out to the right). Every point after that will be at an angle of, in this example, 1/9th, 2/9ths, 9/9ths of the way around the whole circle (21 radians). Use a for loop to go through the point numbers (use integers!) then calculate the radians from that number. Use a line to connect each point to the previous point. You will have to keep track of the previous point using variables. Remember that for a circle with centre (xc, yo), radius r. the point at an angle of 8 radians around the circle is ( X +r cos(@), y. + r sin(@). b. Onc a is working, use the value mousex/20 to determine the value of points instead. In the draw() block, orase the window and draw a new polygon every time. Watch what happens as you move the mouse from left to right.
Transcribed Image Text:Exercise 4. Computers do not draw perfect circles. Because there is only a limited number of pixels, a circle in a computer can only be an approximation of a perfect circle. Usually, any smart program does a good job and uses a lot of tricks to make it look good enough that you see it as a perfect circle. At the right, you see a circle approximated by 9 line segments (a 9-sided polygon). As more sides are added, the circle gets smoother. In this exercise you will draw polygons of various sizes, controlled by the mouse, to approximate a circle. Use a radius of 100 (diameter 200) as shown a. First, use a for loop to draw the example given here, with exactly 9 points. The starting point for the first is at angle 0 (straight out to the right). Every point after that will be at an angle of, in this example, 1/9th, 2/9ths, 9/9ths of the way around the whole circle (21 radians). Use a for loop to go through the point numbers (use integers!) then calculate the radians from that number. Use a line to connect each point to the previous point. You will have to keep track of the previous point using variables. Remember that for a circle with centre (xc, yo), radius r. the point at an angle of 8 radians around the circle is ( X +r cos(@), y. + r sin(@). b. Onc a is working, use the value mousex/20 to determine the value of points instead. In the draw() block, orase the window and draw a new polygon every time. Watch what happens as you move the mouse from left to right.
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