/**
* Clip all segments at screen to make sure we don't have to render huge coordinates. This is
* especially important for fill the GeneralPath.
*/
private void addClippedSegments() {
geogebra.common.awt.GRectangle viewRect =
AwtFactory.prototype.newRectangle(0, 0, view.getWidth(), view.getHeight());
MyPoint curP = null, prevP;
int size = pathPoints.size();
for (int i = 0; i < size; i++) {
prevP = curP;
curP = pathPoints.get(i);
if (!curP.getLineTo() || prevP == null) {
// moveTo point, make sure it is only slightly outside screen
geogebra.common.awt.GPoint2D p = getPointCloseToScreen(curP.getX(), curP.getY());
addToGeneralPath(p, false);
} else {
// clip line at screen
addClippedLine(prevP, curP, viewRect);
}
}
if (needClosePath) {
// line from last point to first point
addClippedLine(curP, pathPoints.get(0), viewRect);
gp.closePath();
}
}
private void addSimpleSegments() {
int size = pathPoints.size();
for (int i = 0; i < size; i++) {
MyPoint curP = pathPoints.get(i);
addToGeneralPath(curP, curP.getLineTo());
}
if (needClosePath) gp.closePath();
}
private void updateBounds(MyPoint p) {
if (bounds == null) {
bounds = AwtFactory.prototype.newRectangle();
bounds.setBounds((int) p.getX(), (int) p.getY(), 0, 0);
}
if (Math.abs(p.getX()) > largestCoord) largestCoord = Math.abs(p.getX());
if (Math.abs(p.getY()) > largestCoord) largestCoord = Math.abs(p.getY());
bounds.add(p.getX(), p.getY());
}
private void addClippedLine(
MyPoint prevP, MyPoint curP, geogebra.common.awt.GRectangle viewRect) {
// check if both points on screen
if (viewRect.contains(prevP) && viewRect.contains(curP)) {
// draw line to point
addToGeneralPath(curP, true);
return;
}
// at least one point is not on screen: clip line at screen
geogebra.common.awt.GPoint2D[] clippedPoints =
ClipLine.getClipped(
prevP.getX(),
prevP.getY(),
curP.getX(),
curP.getY(),
-10,
view.getWidth() + 10,
-10,
view.getHeight() + 10);
if (clippedPoints != null) {
// we have two intersection points with the screen
// get closest clip point to prevP
int first = 0;
int second = 1;
if (clippedPoints[first].distance(prevP.getX(), prevP.getY())
> clippedPoints[second].distance(prevP.getX(), prevP.getY())) {
first = 1;
second = 0;
}
// draw line to first clip point
addToGeneralPath(clippedPoints[first], true);
// draw line between clip points: this ensures high quality
// rendering
// which Java2D doesn't deliver with the regular float GeneralPath
// and huge coords
addToGeneralPath(clippedPoints[second], true);
// draw line to end point if not already there
addToGeneralPath(getPointCloseToScreen(curP.getX(), curP.getY()), true);
} else {
// line is off screen
// draw line to off screen end point
addToGeneralPath(getPointCloseToScreen(curP.getX(), curP.getY()), true);
}
}
