ICT - Stretching and Mirroring

Which of the following represents the correct signature for the function “scaled”?

• scaled :: (Picture, Number, Number) -> Picture

• scaled :: (Number, Number, Number) -> Picture

• scaled :: (Picture, Picture, Number) -> Picture

• scaled :: (Picture, Picture, Picture) -> Picture

The “horizontal factor” can be defined as which of the following?

• The second Number within the function “scaled,” which specifies how many times larger the copy should be in the horizontal direction

• The first Number within the function “scaled,” which specifies how many times larger the copy should be in the horizontal direction

• The second Number within the function “scaled,” which specifies how many times larger the copy should be in the vertical direction

• The first Number within the function “scaled,” which specifies how many times larger the copy should be in the vertical direction

The “vertical factor” can be defined as which of the following?

• The second Number within the function “scaled,” which specifies how many times larger the copy should be in the horizontal direction

• The first Number within the function “scaled,” which specifies how many times larger the copy should be in the horizontal direction

• The second Number within the function “scaled,” which specifies how many times larger the copy should be in the vertical direction

• The first Number within the function “scaled,” which specifies how many times larger the copy should be in the vertical direction

When using the function “scaled,” if the two Numbers given are not equal, what will happen to the copy of the Picture?

• Unequal numbers do not impact the copy

• The copy will be deformed unevenly in the horizontal direction only

• The copy will be deformed unevenly in either the horizontal or the vertical direction.

• The copy will be deformed unevenly in the vertical direction only

If we wanted to triple the size of the original bird, we could use which of the following codes? (Multiple answers possible)

• 
• 
• 
• 

What happens when you use 0 as a scaling factor?

• The Picture will become anchored around the origin

• The Picture will not stretch in either the horizontal or vertical direction

• The Picture will maintain the size of the original Picture

• The Picture will completely disappear

Which of the following can be used to create a mirror image (without resizing it)?

• birdMirrored = scaled(solidPolygon(birdPoints), 1, -1)

• birdMirrored = scaled(solidPolygon(birdPoints), -1, -1)

• birdMirrored = scaled(solidPolygon(birdPoints), -1, 1)

• birdMirrored = scaled(solidPolygon(birdPoints), 1, 1)

Which of the following would create a mirror image AND resize it?

• birdMirrored = scaled(solidPolygon(birdPoints), -1, -1)

• birdMirrored = scaled(solidPolygon(birdPoints), -2, -2)

• birdMirrored = scaled(solidPolygon(birdPoints), -1, 2)

• birdMirrored = scaled(solidPolygon(birdPoints), 2, 2)

Which of the following would create an ellipse? (Multiple answers possible)

• elongatedCircle = scaled(solidCircle(1), 1, -2)

• elongatedCircle = scaled(solidCircle(1), 1, 1)

• elongatedCircle = scaled(solidCircle(1), -1, -2)

• elongatedCircle = scaled(solidCircle(1), 1, 2)

Which of the following statements is true about the output of the following two lines of code:

1) specialShape = scaled(solidCircle(1), 3, -2)

2) specialShape = scaled(solidCircle(1), -3, -2)

• The code on Line 1 will elongate the solidCircle by 3 units in the positive horizontal direction, with no stretching happening in the negative horizontal direction. Also, solidCircle will elongate by -2 units in the negative vertical direction.

• The code on Line 2 will elongate the solidCircle by -3 units in the negative horizontal direction, with no stretching happening in the positive horizontal direction. Also, solidCircle will elongate by -2 units in the negative vertical direction.

• The outputs will be different, but only in the horizontal direction in which solidCircle is stretched.

• Both outputs will be identical, because a negative or positive Number that stretches a solidCircle will stretch it in both the positive and negative directions.