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CPlotView:GetY
The GetY method returns the y value of a point in the class data matrix.
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y = CPlotView:GetY( n ) |
n is the index of the point in the data array.
y is the point y coordinate.
On success,
this method returns the y coordinate.
On failure,
this method returns 0.
This method returns the y value of the specified point at index n. If n is out of range, the value 0 is returned. To remove ambiguity about whether the point truly has a value of 0 or is out of bounds, check the index before calling this method.
The following script fragment adds some points, then finds the nearest point and prints its x value:
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P = CPlotView:new() |
-- create a new CPlotView |
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P:Add( 11.82, 70.5, 10.25, 12.5) |
-- add a point |
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P:Add( 4.62, 90.5, 11.5, 10.2) |
-- add a point |
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n = P:FindPoint( 4, 72) |
-- get index of point nearest 4,72 |
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Printf("n=%d, y=%lg\n", n,P:GetY(n)) |
-- result: n = 1, y = 70.5 |