void PageBoundary::drawClipped (
Canvas* c, Coord l, Coord b, Coord r, Coord t, Graphic* gs
) {
Coord x0, y0, x1, y1, x2, y2;
BoxObj clipBox(l, b, r, t);
transform(0, 0, x0, y0, gs);
transform(border, pageheight, x1, y1, gs);
transform(pagewidth, border, x2, y2, gs);
BoxObj lbox(x0, y0, x1, y1);
BoxObj bbox(x0, y0, x2, y2);
transform(pagewidth - border, 0, x0, y0, gs);
transform(0, pageheight - border, x1, y1, gs);
transform(pagewidth, pageheight, x2, y2, gs);
BoxObj rbox(x0, y0, x2, y2);
BoxObj tbox(x1, y1, x2, y2);
update(gs);
if (lbox.Intersects(clipBox)) {
pFillRect(c, 0, 0, border, pageheight);
}
if (bbox.Intersects(clipBox)) {
pFillRect(c, 0, 0, pagewidth, border);
}
if (rbox.Intersects(clipBox)) {
pFillRect(c, pagewidth - border, 0, pagewidth, pageheight);
}
if (tbox.Intersects(clipBox)) {
pFillRect(c, 0, pageheight - border, pagewidth, pageheight);
}
}
boolean BoxObj::Intersects (LineObj& l) {
Coord x1 = min(l._p1._x, l._p2._x);
Coord x2 = max(l._p1._x, l._p2._x);
Coord y1 = min(l._p1._y, l._p2._y);
Coord y2 = max(l._p1._y, l._p2._y);
BoxObj lbox(x1, y1, x2, y2);
boolean intersects = false;
if (Intersects(lbox)) {
intersects = Contains(l._p1) || Contains(l._p2);
if (!intersects) {
LineObj l0 (_left, _bottom, _right, _bottom);
LineObj l1 (_right, _bottom, _right, _top);
LineObj l2 (_right, _top, _left, _top);
LineObj l3 (_left, _top, _left, _bottom);
intersects =
l.Intersects(l0) || l.Intersects(l1) ||
l.Intersects(l2) || l.Intersects(l3);
}
}
return intersects;
}
