@Override
public void remove() {
if (removed) return;
super.remove();
f.removeAlgorithm(algo);
f.removeAlgorithm(cv);
A.removeAlgorithm(algo);
A.removeAlgorithm(cv);
// make sure all AlgoCASDerivatives get removed
cv.remove();
}
// calc tangent at x=a
public final void compute() {
if (!(f.isDefined() && P.isDefined() && deriv.isDefined())) {
tangent.setUndefined();
return;
}
// calc the tangent;
double a = P.inhomX;
double fa = f.evaluate(a);
double slope = deriv.evaluate(a);
tangent.setCoords(-slope, 1.0, a * slope - fa);
if (!pointOnFunction) T.setCoords(a, fa, 1.0);
}
@Override
public final void update() {
isVisible = geo.isEuclidianVisible();
if (!isVisible) return;
labelVisible = geo.isLabelVisible();
updateStrokes(n);
if (!geo.getDrawAlgorithm().equals(geo.getParentAlgorithm())) init();
if (gp == null) gp = new GeneralPathClipped(view);
else gp.reset();
// init gp
double aRW = a.getDouble();
double bRW = b.getDouble();
// for DrawParametricCurve.plotCurve to work with special values,
// these changes are needed (also filter out out of screen integrals)
// see #1234
aRW = Math.max(aRW, view.getXmin() - EuclidianStatic.CLIP_DISTANCE);
if (aRW > view.getXmax() + EuclidianStatic.CLIP_DISTANCE) return;
bRW = Math.min(bRW, view.getXmax() + EuclidianStatic.CLIP_DISTANCE);
if (bRW < view.getXmin() - EuclidianStatic.CLIP_DISTANCE) return;
double ax = view.toScreenCoordXd(aRW);
double bx = view.toScreenCoordXd(bRW);
float y0 = (float) view.getyZero();
// plot definite integral
if (Kernel.isEqual(aRW, bRW)) {
gp.moveTo(ax, y0);
gp.lineTo(ax, view.toScreenCoordYd(f.evaluate(aRW)));
gp.lineTo(ax, y0);
return;
}
gp.moveTo(ax, y0);
DrawParametricCurve.plotCurve(f, aRW, bRW, view, gp, false, DrawParametricCurve.GAP_LINE_TO);
gp.lineTo(bx, y0);
gp.lineTo(ax, y0);
// gp on screen?
if (!gp.intersects(0, 0, view.getWidth(), view.getHeight())) {
isVisible = false;
// don't return here to make sure that getBounds() works for
// offscreen points too
}
if (labelVisible) {
xLabel = (int) Math.round((ax + bx) / 2) - 6;
yLabel = (int) view.getyZero() - view.getFontSize();
labelDesc = geo.getLabelDescription();
addLabelOffset();
}
}
@Override
public final void compute() {
size = inputList.size();
if (!inputList.isDefined() || !function.toGeoElement().isDefined()) {
r2.setUndefined();
return;
}
GeoFunction funGeo = function.getGeoFunction();
// Calculate errorsum and ssy:
double sumyy = 0.0d;
double sumy = 0.0d;
double syy = 0.0d;
double errorsum = 0.0d;
GeoElement geo = null;
GeoPoint point = null;
double x, y, v;
for (int i = 0; i < size; i++) {
geo = inputList.get(i);
if (geo.isGeoPoint()) {
point = (GeoPoint) geo;
x = point.getX();
y = point.getY();
v = funGeo.evaluate(x);
errorsum += (v - y) * (v - y);
sumy += y;
sumyy += y * y;
} else {
r2.setUndefined();
return;
} // if calculation is possible
} // for all points
syy = sumyy - sumy * sumy / size;
// calculate RSquare
r2.setValue(1 - errorsum / syy);
} // compute()
@Override
public final void compute() {
// bugfix Michael Borcherds
// undefined unless A is a point on f
if (!f.isOnPath(A, Kernel.MIN_PRECISION)) {
circle.setUndefined();
return;
}
double radius = 1 / Math.abs(curv.getValue());
double r2 = radius * radius;
double x = r2 * v.x;
double y = r2 * v.y;
R.setCoords(A.inhomX + x, A.inhomY + y, 1.0);
circle.setCircle(R, A);
}
public final String toString() {
// Michael Borcherds 2008-03-30
// simplified to allow better Chinese translation
return app.getPlain("TangentToAatB", f.getLabel(), "x = x(" + P.getLabel() + ")");
}