/**
* Compute a transformation matrix that pass from graph units (user space) to pixel units (device
* space) so that the whole graph is visible.
*
* @param g2 The Swing graphics.
*/
protected void autoFitView(Graphics2D g2) {
double sx, sy;
double tx, ty;
double padXgu = getPaddingXgu() * 2;
double padYgu = getPaddingYgu() * 2;
double padXpx = getPaddingXpx() * 2;
double padYpx = getPaddingYpx() * 2;
sx = (metrics.viewport[2] - padXpx) / (metrics.size.data[0] + padXgu); // Ratio
// along
// X
sy = (metrics.viewport[3] - padYpx) / (metrics.size.data[1] + padYgu); // Ratio
// along
// Y
tx = metrics.lo.x + (metrics.size.data[0] / 2); // Centre of graph in X
ty = metrics.lo.y + (metrics.size.data[1] / 2); // Centre of graph in Y
if (sx <= 0) {
sx =
(metrics.viewport[2] - Math.min(metrics.viewport[2] - 1, padXpx))
/ (metrics.size.data[0] + padXgu);
}
if (sy <= 0) {
sy =
(metrics.viewport[3] - Math.min(metrics.viewport[3] - 1, padYpx))
/ (metrics.size.data[1] + padYgu);
}
if (sx > sy) // The least ratio.
sx = sy;
else sy = sx;
g2.translate(metrics.viewport[2] / 2, metrics.viewport[3] / 2);
if (rotation != 0) g2.rotate(rotation / (180 / Math.PI));
g2.scale(sx, -sy);
g2.translate(-tx, -ty);
Tx = g2.getTransform();
xT = new AffineTransform(Tx);
try {
xT.invert();
} catch (NoninvertibleTransformException e) {
logger.warning("Cannot inverse gu2px matrix.");
}
zoom = 1;
center.set(tx, ty, 0);
metrics.setRatioPx2Gu(sx);
metrics.loVisible.copy(metrics.lo);
metrics.hiVisible.copy(metrics.hi);
}
/**
* Enable or disable automatic adjustment of the view to see the entire graph.
*
* @param on If true, automatic adjustment is enabled.
*/
public void setAutoFitView(boolean on) {
if (autoFit && (!on)) {
// We go from autoFit to user view, ensure the current centre is at
// the
// middle of the graph, and the zoom is at one.
zoom = 1;
center.set(
metrics.lo.x + (metrics.size.data[0] / 2), metrics.lo.y + (metrics.size.data[1] / 2), 0);
}
autoFit = on;
}
/*
* (non-Javadoc)
*
* @see org.graphstream.ui.swingViewer.util.Camera#setViewCenter(double,
* double, double)
*/
public void setViewCenter(double x, double y, double z) {
setAutoFitView(false);
center.set(x, y, z);
graph.graphChanged = true;
}