/**
* Align given bounds with square size and expand by given fraction
*
* @param bounds
* @param size
* @return
*/
private ReferencedEnvelope align(ReferencedEnvelope bounds, double size, double expand) {
bounds = new ReferencedEnvelope(bounds);
bounds.expandBy(expand * size);
double x = offset(bounds.getLowerCorner(), 0, size);
double y = offset(bounds.getLowerCorner(), 1, size);
bounds.translate(-x, -y);
return bounds;
}
/**
* Called after the base image has been dragged. Sets the new map area and transforms
*
* @param env the display area (world coordinates) prior to the image being moved
* @param paintArea the current drawing area (screen units)
*/
private void afterImageMove() {
final ReferencedEnvelope env = content.getViewport().getBounds();
if (env == null) return;
int dx = imageOrigin.x;
int dy = imageOrigin.y;
DirectPosition2D newPos = new DirectPosition2D(dx, dy);
screenToWorld.transform(newPos, newPos);
env.translate(env.getMinimum(0) - newPos.x, env.getMaximum(1) - newPos.y);
doSetDisplayArea(env);
imageOrigin.setLocation(0, 0);
redrawBaseImage = true;
}