/** Turns a List<CubicCurve2D.Float> into a SVG Element representing a sketch of that spline. */
Element splineToSketch(SVGDocument document, List<CubicCurve2D.Float> spline) {
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
// <g> is an SVG group
// TODO: add a random(ish) rotation to the group
Element group = document.createElementNS(svgNS, "g");
// For each curve in the path, draw along it using a "brush". In
// our case the brush is a simple circle, but this could be changed
// to something more advanced.
for (CubicCurve2D.Float curve : spline) {
// TODO: magic number & step in loop guard
for (double i = 0.0; i <= 1.0; i += 0.01) {
Point2D result = evalParametric(curve, i);
// Add random jitter at some random positive or negative
// distance along the unit normal to the tangent of the
// curve
Point2D n = vectorUnitNormal(evalParametricTangent(curve, i));
float dx = (float) ((Math.random() - 0.5) * n.getX());
float dy = (float) ((Math.random() - 0.5) * n.getY());
Element brush = document.createElementNS(svgNS, "circle");
brush.setAttribute("cx", Double.toString(result.getX() + dx));
brush.setAttribute("cy", Double.toString(result.getY() + dy));
// TODO: magic number for circle radius
brush.setAttribute("r", Double.toString(1.0));
brush.setAttribute("fill", "green");
brush.setAttributeNS(null, "z-index", Integer.toString(zOrder.CONTOUR.ordinal()));
group.appendChild(brush);
}
}
return group;
}
/**
* Draws a concreteDiagram as an SVG.
*
* <p>This approach is wholly declarative. It currently knows nothing about the on screen
* rendering of the diagram. To make decisions based on the on screen rendering (such as better
* label placement) we will, in future, have to build a GVT (from the Batik library) of the
* SVGDocument.
*
* @returns An SVGDocument DOM structure representing the SVG.
*/
@Override
public SVGDocument toSVG(ConcreteDiagram cd) {
// Get a DOMImplementation.
DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
// Create an instance of org.w3c.dom.Document.
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
SVGDocument document = (SVGDocument) domImpl.createDocument(svgNS, "svg", null);
// Get the root element (the 'svg' element).
Element svgRoot = document.getDocumentElement();
// Set the width and height attributes on the root 'svg' element.
svgRoot.setAttributeNS(null, "width", Integer.toString(cd.getSize()));
svgRoot.setAttributeNS(null, "height", Integer.toString(cd.getSize()));
// Draw the shaded zones
for (ConcreteZone z : cd.getShadedZones()) {
Element path = document.createElementNS(svgNS, "path");
path.setAttributeNS(null, "d", toSVGPath(z.getShape(cd.getBox())));
path.setAttributeNS(null, "fill", "#cccccc"); // grey
path.setAttributeNS(null, "z-index", Integer.toString(zOrder.SHADING.ordinal()));
svgRoot.appendChild(path);
}
// TODO: Concrete* should return themselves as DocumentFragments
for (CircleContour c : cd.getCircles()) {
// Draw the circle
Element circle = document.createElementNS(svgNS, "circle");
circle.setAttributeNS(null, "cx", Double.toString(c.get_cx()));
circle.setAttributeNS(null, "cy", Double.toString(c.get_cy()));
circle.setAttributeNS(null, "r", Double.toString(c.get_radius()));
circle.setAttributeNS(null, "z-index", Integer.toString(zOrder.CONTOUR.ordinal()));
// Not pretty, but it works.
Color strokeColor = c.color();
circle.setAttributeNS(
null, "stroke", (null == strokeColor) ? "black" : "#" + toHexString(c.color()));
circle.setAttributeNS(null, "stroke-width", "2");
circle.setAttributeNS(null, "fill", "none");
svgRoot.appendChild(circle);
// TODO: Put this text in a path around the circle
// alternatively come up with some better label placement
// algorithm
Element text = document.createElementNS(svgNS, "text");
text.setAttributeNS(null, "x", Double.toString(c.get_cx()));
text.setAttributeNS(null, "y", Double.toString(c.get_cy() + c.get_radius()));
text.setAttributeNS(null, "text-anchor", "middle");
text.setAttributeNS(
null, "fill", (null == strokeColor) ? "black" : "#" + toHexString(c.color()));
text.setAttributeNS(null, "z-index", Integer.toString(zOrder.LABEL.ordinal()));
Text textNode = document.createTextNode(c.ac.getLabel().getLabel());
text.appendChild(textNode);
svgRoot.appendChild(text);
}
for (ConcreteSpider cs : cd.getSpiders()) {
for (ConcreteSpiderFoot f : cs.feet) {
// Draw the foot
Element circle = document.createElementNS(svgNS, "circle");
circle.setAttributeNS(null, "cx", Double.toString(f.getX()));
circle.setAttributeNS(null, "cy", Double.toString(f.getY()));
circle.setAttributeNS(null, "r", Double.toString(ConcreteSpiderFoot.FOOT_RADIUS));
circle.setAttributeNS(null, "z-index", Integer.toString(zOrder.SPIDER.ordinal()));
circle.setAttributeNS(null, "stroke", "black");
circle.setAttributeNS(null, "stroke-width", "2");
circle.setAttributeNS(null, "fill", "black");
svgRoot.appendChild(circle);
}
for (ConcreteSpiderLeg l : cs.legs) {
Element line = document.createElementNS(svgNS, "line");
line.setAttributeNS(null, "x1", Double.toString(l.from.getX()));
line.setAttributeNS(null, "y1", Double.toString(l.from.getY()));
line.setAttributeNS(null, "x2", Double.toString(l.to.getX()));
line.setAttributeNS(null, "y2", Double.toString(l.to.getY()));
line.setAttributeNS(null, "z-index", Integer.toString(zOrder.SPIDER.ordinal()));
line.setAttributeNS(null, "stroke", "black");
line.setAttributeNS(null, "stroke-width", "2");
line.setAttributeNS(null, "fill", "black");
svgRoot.appendChild(line);
}
}
return document;
}