public Arc2D evaluate(Arc2D v0, Arc2D v1, float fraction) {
double x = v0.getX() + ((v1.getX() - v0.getX()) * fraction);
double y = v0.getY() + ((v1.getY() - v0.getY()) * fraction);
double w = v0.getWidth() + ((v1.getWidth() - v0.getWidth()) * fraction);
double h = v0.getHeight() + ((v1.getHeight() - v0.getHeight()) * fraction);
double start = v0.getAngleStart() + ((v1.getAngleStart() - v0.getAngleStart()) * fraction);
double extent = v0.getAngleExtent() + ((v1.getAngleExtent() - v0.getAngleExtent()) * fraction);
Arc2D value = (Arc2D) v0.clone();
value.setArc(x, y, w, h, start, extent, v0.getArcType());
return value;
}
/** @param arc the Arc2D object to be converted */
public Element toSVG(Arc2D arc) {
double ext = arc.getAngleExtent();
double width = arc.getWidth();
double height = arc.getHeight();
if (width == 0 || height == 0) {
Line2D line =
new Line2D.Double(arc.getX(), arc.getY(), arc.getX() + width, arc.getY() + height);
if (svgLine == null) {
svgLine = new SVGLine(generatorContext);
}
return svgLine.toSVG(line);
}
if (ext >= 360 || ext <= -360) {
Ellipse2D ellipse = new Ellipse2D.Double(arc.getX(), arc.getY(), width, height);
if (svgEllipse == null) {
svgEllipse = new SVGEllipse(generatorContext);
}
return svgEllipse.toSVG(ellipse);
}
Element svgPath = generatorContext.domFactory.createElementNS(SVG_NAMESPACE_URI, SVG_PATH_TAG);
StringBuffer d = new StringBuffer("");
Point2D startPt = arc.getStartPoint();
Point2D endPt = arc.getEndPoint();
int type = arc.getArcType();
d.append(PATH_MOVE);
d.append(doubleString(startPt.getX()));
d.append(SPACE);
d.append(doubleString(startPt.getY()));
d.append(SPACE);
d.append(PATH_ARC);
d.append(doubleString(width / 2));
d.append(SPACE);
d.append(doubleString(height / 2));
d.append(SPACE);
d.append("0"); // no rotation with J2D arc.
d.append(SPACE);
if (ext > 0) {
// CCW sweep case, ext > 0
if (ext > 180) d.append("1"); // use large arc.
else d.append("0"); // use small arc.
d.append(SPACE);
d.append("0"); // sweep ccw
} else {
// CW sweep case, ext < 0
if (ext < -180) d.append("1"); // use large arc.
else d.append("0"); // use small arc.
d.append(SPACE);
d.append("1"); // sweep cw
}
d.append(SPACE);
d.append(doubleString(endPt.getX()));
d.append(SPACE);
d.append(doubleString(endPt.getY()));
if (type == Arc2D.CHORD) {
d.append(PATH_CLOSE);
} else if (type == Arc2D.PIE) {
double cx = arc.getX() + width / 2;
double cy = arc.getY() + height / 2;
d.append(PATH_LINE_TO);
d.append(SPACE);
d.append(doubleString(cx));
d.append(SPACE);
d.append(doubleString(cy));
d.append(SPACE);
d.append(PATH_CLOSE);
}
svgPath.setAttributeNS(null, SVG_D_ATTRIBUTE, d.toString());
return svgPath;
}