private GeoElement[] processParametric(Parametric par) throws CircularDefinitionException {
/*
ExpressionValue temp = P.evaluate();
if (!temp.isVectorValue()) {
String [] str = { "VectorExpected", temp.toString() };
throw new MyParseError(kernel.getApplication(), str);
}
v.resolveVariables();
temp = v.evaluate();
if (!(temp instanceof VectorValue)) {
String [] str = { "VectorExpected", temp.toString() };
throw new MyParseError(kernel.getApplication(), str);
} */
// point and vector are created silently
boolean oldMacroMode = cons.isSuppressLabelsActive();
cons.setSuppressLabelCreation(true);
// get point
ExpressionNode node = par.getP();
node.setForcePoint();
GeoElement[] temp = processExpressionNode(node);
GeoPoint P = (GeoPoint) temp[0];
// get vector
node = par.getv();
node.setForceVector();
temp = processExpressionNode(node);
GeoVector v = (GeoVector) temp[0];
// switch back to old mode
cons.setSuppressLabelCreation(oldMacroMode);
// Line through P with direction v
GeoLine line;
// independent line
if (P.isConstant() && v.isConstant()) {
line = new GeoLine(cons);
line.setCoords(-v.y, v.x, v.y * P.inhomX - v.x * P.inhomY);
}
// dependent line
else {
line = kernel.Line(par.getLabel(), P, v);
}
line.setToParametric(par.getParameter());
line.updateRepaint();
GeoElement[] ret = {line};
return ret;
}
protected GeoElement[] processLine(Equation equ, boolean inequality) {
double a = 0, b = 0, c = 0;
GeoLine line;
GeoElement[] ret = new GeoElement[1];
String label = equ.getLabel();
Polynomial lhs = equ.getNormalForm();
boolean isExplicit = equ.isExplicit("y");
boolean isIndependent = lhs.isConstant();
if (isIndependent) {
// get coefficients
a = lhs.getCoeffValue("x");
b = lhs.getCoeffValue("y");
c = lhs.getCoeffValue("");
line = kernel.Line(label, a, b, c);
} else line = kernel.DependentLine(label, equ);
if (isExplicit) {
line.setToExplicit();
line.updateRepaint();
}
ret[0] = line;
return ret;
}
@Override
public final String toString() {
// Michael Borcherds 2008-03-30
// simplified to allow better Chinese translation
return app.getPlain("DistanceOfAandB", g.getLabel(), h.getLabel());
}
// calc length of vector v
@Override
public final void compute() {
dist.setValue(g.distance(h));
}
public final void update() {
isVisible = geo.isEuclidianVisible();
if (isVisible) {
if (!geo.getDrawAlgorithm().equals(geo.getParentAlgorithm())) init();
int slopeTriangleSize = slope.getSlopeTriangleSize();
double rwHeight = slope.getValue() * slopeTriangleSize;
double height = view.yscale * rwHeight;
if (Math.abs(height) > Float.MAX_VALUE) {
isVisible = false;
return;
}
// get point on line g
g.getInhomPointOnLine(coords);
if (g.getStartPoint() == null) {
// get point on y-axis and line g
coords[0] = 0.0d;
coords[1] = -g.z / g.y;
}
view.toScreenCoords(coords);
// draw slope triangle
double x = coords[0];
double y = coords[1];
double xright = x + view.xscale * slopeTriangleSize;
if (gp == null) gp = new GeneralPathClipped(view);
gp.reset();
gp.moveTo(x, y);
gp.lineTo(xright, y);
gp.lineTo(xright, y - height);
// gp on screen?
if (!gp.intersects(0, 0, view.width, view.height)) {
isVisible = false;
// don't return here to make sure that getBounds() works for offscreen points too
}
// label position
labelVisible = geo.isLabelVisible();
if (labelVisible) {
if (slopeTriangleSize > 1) {
StringBuilder sb = new StringBuilder();
switch (slope.getLabelMode()) {
case GeoElement.LABEL_NAME_VALUE:
sb.append(slopeTriangleSize);
sb.append(' ');
sb.append(geo.getLabel());
sb.append(" = ");
sb.append(kernel.format(rwHeight));
break;
case GeoElement.LABEL_VALUE:
sb.append(kernel.format(rwHeight));
break;
default: // case GeoElement.LABEL_NAME:
sb.append(slopeTriangleSize);
sb.append(' ');
sb.append(geo.getLabel());
break;
}
labelDesc = sb.toString();
} else {
labelDesc = geo.getLabelDescription();
}
yLabel = (int) (y - height / 2.0f + 6);
xLabel = (int) (xright) + 5;
addLabelOffset();
// position off horizontal label (i.e. slopeTriangleSize)
xLabelHor = (int) ((x + xright) / 2.0);
yLabelHor = (int) (y + view.fontSize + 2);
StringBuilder sb = new StringBuilder();
sb.append(slopeTriangleSize);
horLabel = sb.toString();
}
updateStrokes(slope);
}
}