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Diffstat (limited to 'helpers.py')
| -rw-r--r-- | helpers.py | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/helpers.py b/helpers.py new file mode 100644 index 0000000..87dd4f7 --- /dev/null +++ b/helpers.py @@ -0,0 +1,22 @@ +#================================================================== +# Physics.activity +# Helper classes and functions +# By Alex Levenson +#================================================================== +import math +# distance calculator, pt1 and pt2 are ordred pairs +def distance(pt1, pt2): + return math.sqrt((pt1[0] - pt2[0]) ** 2 + (pt1[1] -pt2[1]) ** 2) + +# returns the angle between the line segment from pt1 --> pt2 and the x axis, from -pi to pi +def getAngle(pt1,pt2): + xcomp = pt2[0] - pt1[0] + ycomp = pt1[1] - pt2[1] + return math.atan2(ycomp,xcomp) + +# returns a list of ordered pairs that describe an equilteral triangle around the segment from pt1 --> pt2 +def constructTriangleFromLine(p1,p2): + halfHeightVector = (0.57735*(p2[1] - p1[1]), 0.57735*(p2[0] - p1[0])) + p3 = (p1[0] + halfHeightVector[0], p1[1] - halfHeightVector[1]) + p4 = (p1[0] - halfHeightVector[0], p1[1] + halfHeightVector[1]) + return [p2,p3,p4] |