Section 312: Reflected movement

If mouseX = 40, then 400-mouseX must equal ____

Tags

CCSS.6.EE.A.2C

If mouseX = 300, then 400-mouseX must equal ____

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.5

CCSS.6.EE.B.6

How wide is the canvas?

Tags

CCSS.2.MD.B.5

What is the height of the canvas?

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CCSS.3.MD.D.8

When you move the mouse from left to right...

• mouseX goes from 0 to 400

• mouseX goes from 400 to 0

• mouseY goes from 0 to 400

• mouseY goes from 400 to 0

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSF.IF.C.7

If you want reflect a shape on the canvas and you draw it at mouseX, then it will be ____ from the left edge of the canvas.

• mouseX

• mouseY

• 400-mouseX

• There is no way of knowing

• I'm really not sure

Answer explanation

See the black dot in the image? Remember, wherever the mouse cursor is, mouseX and mouseY will be the x and y value of the canvas. If the mouse cursor is at 120, then it is 120 from the left edge. If the mouse cursor is at 270, then it is 270 from the left edge. So, if the mouse is at mouseX, then it is mouseX from the left edge.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

The red dot is at (mouseX, 240), the reflected dot (the blue one) is at...

• (mouseX, 240)

• (mouseX-400, 240)

• (133, 240)

• (400-mouseX,240)

• I'm really not sure

Answer explanation

Notice the red dot is mouseX from the left edge. Notice that when the blue dot is the same distance from the right edge, the blue dot will be 400-mouseX from the left edge. So, if we want the blue dot to be a reflection of the red dot, then the x position of the blue dot can be described as 400-mouseX. So, the position of the blue dot must be (400-mouseX, 240).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If your code draws a red circle where you click on the canvas, then the blue dot that is reflected across the middle of the canvas will be at:

• (mouseX, mouseY)

• (400-mouseX, 400-mouseY)

• (400-mouseX, mouseY)

• (mouseX, 400-mouseY)

• I'm really not sure

Answer explanation

The reflected dot will be at (400-mouseX, mouseY) because the mouseY will be the same for both dots.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If the green dot is a reflection of the red dot and the red dot is drawn at (mouseX, mouseY), then the centerX of the green dot is...

• 400-mouseX

• mouseX-400

• 400-mouseY

• mouseY-400

• None of these are correct

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

If the green dot is a reflection of the red dot and the red dot is drawn at (mouseX, mouseY), then the centerX of the green dot is...

• 400-mouseX

• mouseX-400

• mouseX

• mouseY

• I'm really not sure

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5