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Given a set of points, (x1, y1), (x2, y2), etc.
Take the absolute value of each point's x and y values, and replace those.
Take the inverse point of each point, e.x. (x1, y1) -> (y1, x1)
Apply the signs that correspond to the quadrant counterclockwise of the quadrant the point was in.
e.x. (3, 5) is in the First Quadrant. The Second Quadrant is counterclockwise of the First, so we will have the x-value of the point negative: (-3, 5).
Do that for all points.
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How do you rotate a polygon 90 degrees counterclockwise about the origin?
{1 0} {0 -1}
How do you rotate a figure 90 degrees counterclockwise about origin?
Ex: -1,-2 Switch the numbers, so with the example it would be -2,-1. Next multiply your x coordinate by -1,so the example would be 2,-1
How do you rotate a figure about the origin?
The x,y origin is 0,0
How do you rotate a figure 90 degrees counterclockwise?
The formula is (x,y) -> (y,-x). Verbal : switch the coordinates ; then change the sign of the new x coordinate. Example : (2,1) -> (1,-2)
How do you rotate 270 degrees about origin?
You rotate everything to the left, 3/4 of a full turn.As an example of the result, the positive x-axis winds uppointing down from the origin.
