private void updateScale(double oldScale, double newScale, SVGElement svg, int cx, int cy) {
double zoomFactor = newScale / oldScale;
// (x in new coord system - x in old coord system)/x coordinate
SVGGElement g = m_svgViewPort.cast();
if (cx == 0) {
cx = (int) (Math.ceil(svg.getOffsetWidth() / 2.0) - 1);
}
if (cy == 0) {
cy = (int) (Math.ceil(svg.getOffsetHeight() / 2.0) - 1);
}
SVGPoint p = svg.createSVGPoint();
p.setX(cx);
p.setY(cy);
p = p.matrixTransform(g.getCTM().inverse());
SVGMatrix m =
svg.createSVGMatrix()
.translate(p.getX(), p.getY())
.scale(zoomFactor)
.translate(-p.getX(), -p.getY());
SVGMatrix ctm = g.getCTM().multiply(m);
consoleLog("zoomFactor: " + zoomFactor + " oldScale: " + oldScale + " newScale:" + newScale);
D3.d3()
.select(m_svgViewPort)
.transition()
.duration(1000)
.attr("transform", matrixTransform(ctm));
}
@Override
public void move() {
Event event = D3.getEvent().cast();
SVGPoint p = getEventPoint(event).matrixTransform(m_stateTf);
SVGElement svg = getContainerElement().cast();
SVGGElement g = getDraggableElement().cast();
SVGRect gBox = g.getBBox();
SVGMatrix m =
m_stateTf
.inverse()
.translate(p.getX() - m_stateOrigin.getX(), p.getY() - m_stateOrigin.getY());
double mapWidth = gBox.getWidth() * m.getA();
double mapHeight = gBox.getHeight() * m.getA();
double boundaryX = calculateBoundsX(mapWidth, svg.getOffsetWidth(), m.getE());
double boundaryY = calculateBoundsY(mapHeight, svg.getOffsetHeight(), m.getF());
String matrixTransform =
"matrix(" + m.getA() + ", " + m.getB() + ", " + m.getC() + ", " + m.getD() + ", "
+ boundaryX + ", " + boundaryY + ")";
getDraggableElement().setAttribute("transform", matrixTransform);
// Updating the reference map
// TODO: this needs to be reworked a little its off
double viewPortWidth = (getContainerElement().getOffsetWidth() / m.getA()) * 0.4;
double viewPortHeight = (getContainerElement().getOffsetHeight() / m.getA()) * 0.4;
m_referenceMapViewport.setAttribute("width", "" + viewPortWidth);
m_referenceMapViewport.setAttribute("height", "" + viewPortHeight);
m_referenceMapViewport.setAttribute("x", "" + (-boundaryX * 0.4));
m_referenceMapViewport.setAttribute("y", "" + (-boundaryY * 0.4));
}