@Override
public void compute() {
// check origin
if (!((GeoElement) origin).isDefined() || origin.isInfinite()) {
getQuadric().setUndefined();
return;
}
// check direction
Coords d = getDirection();
if (d.equalsForKernel(0, Kernel.STANDARD_PRECISION)) {
getQuadric().setUndefined();
return;
}
// check number
double r = getComputer().getNumber(((NumberValue) getNumber()).getDouble());
if (Double.isNaN(r)) {
getQuadric().setUndefined();
return;
}
// compute the quadric
getQuadric().setDefined();
getComputer().setQuadric(getQuadric(), origin.getInhomCoordsInD(3), d, r);
}
protected Coords getNormalProjectionParameters(Coords coords) {
Coords parameters = super.getNormalProjectionParameters(coords);
if (parameters.getY() < getMinParameter(1)) parameters.setY(getMinParameter(1));
else if (parameters.getY() > getMaxParameter(1)) parameters.setY(getMaxParameter(1));
return parameters;
}
protected void setColors(double alpha, Coords color, Coords colorHighlighted) {
Color c = getGeoElement().getObjectColor();
color.set(
new Coords(
(double) c.getRed() / 255,
(double) c.getGreen() / 255,
(double) c.getBlue() / 255,
alpha));
if (getView3D().isGrayScaled()) color.convertToGrayScale();
// creates corresponding color for highlighting
double r = color.getX();
double g = color.getY();
double b = color.getZ();
double d = r + g + b;
Coords color2;
double distance;
if (d > LIGHT_COLOR) { // color is closer to white : darken it
distance = Math.sqrt(r * r + g * g + b * b); // euclidian distance to black
color2 = new Coords(0, 0, 0, color.getW()); // black
} else { // color is closer to black : lighten it
r = 1 - r;
g = 1 - g;
b = 1 - b;
distance = Math.sqrt(r * r + g * g + b * b); // euclidian distance to white
color2 = new Coords(1, 1, 1, color.getW()); // white
}
double s = getColorShift() / distance;
colorHighlighted.set(color.mul(1 - s).add(color2.mul(s)));
// sufficient alpha to be seen
if (colorHighlighted.getW() < ALPHA_MIN_HIGHLIGHTING)
colorHighlighted.setW(ALPHA_MIN_HIGHLIGHTING);
}