private Handle[] getHandleArray(HandleGesture gesture) {
if (gesture == null) {
return new Handle[] { new Handle(this, p0), new Handle(this, p1),
new Handle(this, p2) };
} else {
Handle g = gesture.getHandle();
int gx = g.getX() + gesture.getDeltaX();
int gy = g.getY() + gesture.getDeltaY();
Handle[] ret = { new Handle(this, p0), new Handle(this, p1),
new Handle(this, p2) };
if (g.isAt(p0)) {
if (gesture.isShiftDown()) {
Location p = LineUtil.snapTo8Cardinals(p2, gx, gy);
ret[0] = new Handle(this, p);
} else {
ret[0] = new Handle(this, gx, gy);
}
} else if (g.isAt(p2)) {
if (gesture.isShiftDown()) {
Location p = LineUtil.snapTo8Cardinals(p0, gx, gy);
ret[2] = new Handle(this, p);
} else {
ret[2] = new Handle(this, gx, gy);
}
} else if (g.isAt(p1)) {
if (gesture.isShiftDown()) {
double x0 = p0.getX();
double y0 = p0.getY();
double x1 = p2.getX();
double y1 = p2.getY();
double midx = (x0 + x1) / 2;
double midy = (y0 + y1) / 2;
double dx = x1 - x0;
double dy = y1 - y0;
double[] p = LineUtil.nearestPointInfinite(gx, gy,
midx, midy, midx - dy, midy + dx);
gx = (int) Math.round(p[0]);
gy = (int) Math.round(p[1]);
}
if (gesture.isAltDown()) {
double[] e0 = { p0.getX(), p0.getY() };
double[] e1 = { p2.getX(), p2.getY() };
double[] mid = { gx, gy };
double[] ct = CurveUtil.interpolate(e0, e1, mid);
gx = (int) Math.round(ct[0]);
gy = (int) Math.round(ct[1]);
}
ret[1] = new Handle(this, gx, gy);
}
return ret;
}
}
@Override
public Handle moveHandle(HandleGesture gesture) {
Handle[] hs = getHandleArray(gesture);
Handle ret = null;
if (!hs[0].equals(p0)) {
p0 = hs[0].getLocation();
ret = hs[0];
}
if (!hs[1].equals(p1)) {
p1 = hs[1].getLocation();
ret = hs[1];
}
if (!hs[2].equals(p2)) {
p2 = hs[2].getLocation();
ret = hs[2];
}
bounds = CurveUtil.getBounds(toArray(p0), toArray(p1), toArray(p2));
return ret;
}
@Override
public boolean contains(Location loc, boolean assumeFilled) {
Object type = getPaintType();
if (assumeFilled && type == DrawAttr.PAINT_STROKE) {
type = DrawAttr.PAINT_STROKE_FILL;
}
if (type != DrawAttr.PAINT_FILL) {
int stroke = getStrokeWidth();
double[] q = toArray(loc);
double[] p0 = toArray(this.p0);
double[] p1 = toArray(this.p1);
double[] p2 = toArray(this.p2);
double[] p = CurveUtil.findNearestPoint(q, p0, p1, p2);
if (p == null) {
return false;
}
int thr;
if (type == DrawAttr.PAINT_STROKE) {
thr = Math.max(Line.ON_LINE_THRESH, stroke / 2);
} else {
thr = stroke / 2;
}
if (LineUtil.distanceSquared(p[0], p[1], q[0], q[1]) < thr * thr) {
return true;
}
}
if (type != DrawAttr.PAINT_STROKE) {
QuadCurve2D curve = getCurve(null);
if (curve.contains(loc.getX(), loc.getY())) {
return true;
}
}
return false;
}
public Curve(Location end0, Location end1, Location ctrl) {
this.p0 = end0;
this.p1 = ctrl;
this.p2 = end1;
bounds = CurveUtil.getBounds(toArray(p0), toArray(p1), toArray(p2));
}