/**
* 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);
}
/**
* Compute a transformation that pass from graph units (user space) to a pixel units (device
* space) so that the view (zoom and centre) requested by the user is produced.
*
* @param g2 The Swing graphics.
*/
protected void userView(Graphics2D g2) {
double sx, sy;
double tx, ty;
double padXgu = getPaddingXgu() * 2;
double padYgu = getPaddingYgu() * 2;
double padXpx = getPaddingXpx() * 2;
double padYpx = getPaddingYpx() * 2;
double gw = gviewport != null ? gviewport[2] - gviewport[0] : metrics.size.data[0];
double gh = gviewport != null ? gviewport[3] - gviewport[1] : metrics.size.data[1];
sx = (metrics.viewport[2] - padXpx) / ((gw + padXgu) * zoom);
sy = (metrics.viewport[3] - padYpx) / ((gh + padYgu) * zoom);
tx = center.x;
ty = center.y;
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.log(Level.WARNING, "Cannot inverse gu2px matrix.", e);
}
metrics.setRatioPx2Gu(sx);
double w2 = (metrics.viewport[2] / sx) / 2;
double h2 = (metrics.viewport[3] / sx) / 2;
metrics.loVisible.set(center.x - w2, center.y - h2);
metrics.hiVisible.set(center.x + w2, center.y + h2);
}