Young Wu's Homepage

# QS2: Week 2 Survey Questions

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📗 Question 0

📗 Question 1

Question 2

📗 Question 3

Question 4

📗 Question 5

Question 6

📗 Question 7

Question 8

📗 Question 9

# Grade

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📗 [1 points] Which ones of the following functions have values between 0 and 500 for every t?

250 + 250 * Math.sin(t)
500 * Math.abs(Math.cos(t))
t % 500
250 + 250 * Math.abs(Math.cos(t))
500 * Math.sin(t)
None of the above.

📗 [1 points] Which ones of the following animation functions (position of a object as a function of time t) make the object move in a circle?

[Math.sin(t), Math.cos(t)]
[Math.sin(2 * t), Math.cos(2 * t)]
[Math.sin(t), Math.cos(2 * t)]
[Math.sin(2 * t), 2 * Math.cos(t)]
[Math.sin(2 * t), Math.sin(2 * t)]
None of the above.

📗 [1 points] Given a mouse click event at the top left corner of an HTML Canvas, and define let box = event.target.getBoundingClientRect();, which ones of the following will return 0?

event.clientX - box.left
event.clientX - box.top
event.clientX - box.width
event.clientX
box.left
None of the above.

📗 [1 points] Suppose the position of mouse click on an HTML Canvas is [x, y], which ones of the following draw a square centered at the mouse position.

context.fillRect(x - 5, y - 5, 10, 10)
context.fillRect(x, y, 10, 10)
context.fillRect(x + 5, y + 5, 10, 10)
context.fillRect(x + 5, y - 5, 10, 10)
context.fillRect(x - 5, y + 5, 10, 10)
None of the above.

📗 [1 points] Which ones of the following transformation combination is equivalent to context.translate(4, 4); context.scale(2, 2); if followed by context.fillRect(0, 0, 1, 1)?

context.scale(2, 2); context.translate(2, 2);
context.scale(2, 2); context.translate(1, 1);
context.scale(2, 2); context.translate(8, 8);
context.scale(4, 4); context.translate(2, 2);
context.scale(4, 4);
None of the above.

📗 [1 points] What is the area of a rectangle (number of pixels) drawn by context.scale(2, -3); context.fillRect(0, 0, 1, 2); context.scale(-1, 2); assuming no other transformations are done.

12
24
6
2
0
None of the above.

📗 [1 points] Which ones of the following transformations mirror reflects a drawing vertically (for example, letter b to letter p)?

context.scale(1, -1)
context.scale(-1, 1)
context.rotate(Math.PI)
context.rotate(-Math.PI)
context.translate(-1, -1)
None of the above.

📗 [1 points] Which ones of the following are rigid transformations?

Scaling by -1
None of the above.

📗 [1 points] Please provide additional comments, questions, or feedback:

📗 [1 points] Have you completed the in-class quiz on TopHat?

Note: if you selected the second or third choice, you will get the same grade from this survey for the in-class quiz; if you selected the forth choice, you only have to complete the last question.

# QS2: Week 2 Survey Questions

# Grade

# Submission