a = 0 (slider from -1 to 1, step 0.0010)
h = 0 (slider from 0 to 30, step 0.01)
k = 0 (slider from 0 to 30, step 0.01)
c: y = a * (x - h)^(2.0) + k
text1: "y = " + a + "(x - " + h + ") + " + k
C = Point(yAxis)
b: y = y(C)
D = Point(b)