private void computeSpline(final ChartModel inputModel, DefaultChartModel splineModel) {
splineModel.clearPoints();
// Create some double arrays and populate them from the chart model
// TODO: xs and ys are assumed to be sorted in the call to computeSplineSlopes, which is not
// guaranteed
final int pointCount = inputModel.getPointCount();
double xs[] = new double[pointCount];
double ys[] = new double[pointCount];
for (int i = 0; i < pointCount; i++) {
Chartable p = inputModel.getPoint(i);
xs[i] = p.getX().position();
ys[i] = p.getY().position();
}
double[] slopes = SplineEngine.computeSplineSlopes(pointCount - 1, xs, ys);
// Number of divisions in each segment
int nDivs = 20;
double rx, ry;
for (int seg = 0; seg < pointCount - 1; seg++) {
double xstep = (xs[seg + 1] - xs[seg]) / nDivs;
for (int i = 0; i <= nDivs; i++) {
rx = xs[seg] + i * xstep;
ry =
SplineEngine.splineEval(
rx, xs[seg], xs[seg + 1], ys[seg], ys[seg + 1], slopes[seg], slopes[seg + 1]);
splineModel.addPoint(rx, ry);
}
}
}
