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320 lines
9.5 KiB
320 lines
9.5 KiB
/* This file is part of the KDE project
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Copyright (C) 2001 Laurent MONTEL <lmontel@mandrakesoft.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "KoPointArray.h"
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#include <KoRect.h>
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#include <stdarg.h>
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#include <KoZoomHandler.h>
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void KoPointArray::translate( double dx, double dy )
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{
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KoPoint *p = data();
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int i = size();
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KoPoint pt( dx, dy );
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while ( i-- ) {
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*p += pt;
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p++;
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}
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}
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void KoPointArray::point( uint index, double *x, double *y ) const
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{
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KoPoint p = TQMemArray<KoPoint>::at( index );
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if ( x )
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*x = (double)p.x();
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if ( y )
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*y = (double)p.y();
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}
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KoPoint KoPointArray::point( uint index ) const
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{ // #### index out of bounds
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return TQMemArray<KoPoint>::at( index );
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}
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void KoPointArray::setPoint( uint index, double x, double y )
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{ // #### index out of bounds
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TQMemArray<KoPoint>::at( index ) = KoPoint( x, y );
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}
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bool KoPointArray::putPoints( int index, int nPoints, double firstx, double firsty,
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... )
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{
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va_list ap;
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if ( index + nPoints > (int)size() ) { // extend array
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if ( !resize(index + nPoints) )
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return FALSE;
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}
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if ( nPoints <= 0 )
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return TRUE;
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setPoint( index, firstx, firsty ); // set first point
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int i = index + 1;
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double x, y;
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nPoints--;
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va_start( ap, firsty );
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while ( nPoints-- ) {
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x = va_arg( ap, double );
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y = va_arg( ap, double );
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setPoint( i++, x, y );
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}
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va_end( ap );
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return TRUE;
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}
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void split(const double *p, double *l, double *r)
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{
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double tmpx;
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double tmpy;
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l[0] = p[0];
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l[1] = p[1];
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r[6] = p[6];
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r[7] = p[7];
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l[2] = (p[0]+ p[2])/2;
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l[3] = (p[1]+ p[3])/2;
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tmpx = (p[2]+ p[4])/2;
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tmpy = (p[3]+ p[5])/2;
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r[4] = (p[4]+ p[6])/2;
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r[5] = (p[5]+ p[7])/2;
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l[4] = (l[2]+ tmpx)/2;
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l[5] = (l[3]+ tmpy)/2;
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r[2] = (tmpx + r[4])/2;
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r[3] = (tmpy + r[5])/2;
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l[6] = (l[4]+ r[2])/2;
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l[7] = (l[5]+ r[3])/2;
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r[0] = l[6];
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r[1] = l[7];
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}
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// Based on:
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//
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// A Fast 2D Point-On-Line Test
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// by Alan Paeth
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// from "Graphics Gems", Academic Press, 1990
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static
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int pnt_on_line( const int* p, const int* q, const int* t )
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{
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/*
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* given a line through P:(px,py) Q:(qx,qy) and T:(tx,ty)
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* return 0 if T is not on the line through <--P--Q-->
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* 1 if T is on the open ray ending at P: <--P
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* 2 if T is on the closed interior along: P--Q
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* 3 if T is on the open ray beginning at Q: Q-->
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*
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* Example: consider the line P = (3,2), Q = (17,7). A plot
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* of the test points T(x,y) (with 0 mapped onto '.') yields:
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*
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* 8| . . . . . . . . . . . . . . . . . 3 3
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* Y 7| . . . . . . . . . . . . . . 2 2 Q 3 3 Q = 2
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* 6| . . . . . . . . . . . 2 2 2 2 2 . . .
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* a 5| . . . . . . . . 2 2 2 2 2 2 . . . . .
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* x 4| . . . . . 2 2 2 2 2 2 . . . . . . . .
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* i 3| . . . 2 2 2 2 2 . . . . . . . . . . .
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* s 2| 1 1 P 2 2 . . . . . . . . . . . . . . P = 2
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* 1| 1 1 . . . . . . . . . . . . . . . . .
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* +--------------------------------------
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* 1 2 3 4 5 X-axis 10 15 19
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*
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* Point-Line distance is normalized with the Infinity Norm
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* avoiding square-root code and tightening the test vs the
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* Manhattan Norm. All math is done on the field of integers.
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* The latter replaces the initial ">= MAX(...)" test with
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* "> (ABS(qx-px) + ABS(qy-py))" loosening both inequality
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* and norm, yielding a broader target line for selection.
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* The tightest test is employed here for best discrimination
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* in merging collinear (to grid coordinates) vertex chains
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* into a larger, spanning vectors within the Lemming editor.
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*/
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// if all points are coincident, return condition 2 (on line)
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if(q[0]==p[0] && q[1]==p[1] && q[0]==t[0] && q[1]==t[1]) {
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return 2;
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}
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if ( TQABS((q[1]-p[1])*(t[0]-p[0])-(t[1]-p[1])*(q[0]-p[0])) >=
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(TQMAX(TQABS(q[0]-p[0]), TQABS(q[1]-p[1])))) return 0;
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if (((q[0]<p[0])&&(p[0]<t[0])) || ((q[1]<p[1])&&(p[1]<t[1])))
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return 1 ;
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if (((t[0]<p[0])&&(p[0]<q[0])) || ((t[1]<p[1])&&(p[1]<q[1])))
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return 1 ;
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if (((p[0]<q[0])&&(q[0]<t[0])) || ((p[1]<q[1])&&(q[1]<t[1])))
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return 3 ;
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if (((t[0]<q[0])&&(q[0]<p[0])) || ((t[1]<q[1])&&(q[1]<p[1])))
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return 3 ;
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return 2 ;
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}
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static
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void polygonizeTQBezier( double* acc, int& accsize, const double ctrl[],
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int maxsize )
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{
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if ( accsize > maxsize / 2 )
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{
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// This never happens in practice.
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if ( accsize >= maxsize-4 )
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return;
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// Running out of space - approximate by a line.
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acc[accsize++] = ctrl[0];
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acc[accsize++] = ctrl[1];
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acc[accsize++] = ctrl[6];
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acc[accsize++] = ctrl[7];
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return;
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}
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//intersects:
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double l[8];
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double r[8];
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split( ctrl, l, r);
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// convert to integers for line condition check
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int c0[2]; c0[0] = int(ctrl[0]); c0[1] = int(ctrl[1]);
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int c1[2]; c1[0] = int(ctrl[2]); c1[1] = int(ctrl[3]);
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int c2[2]; c2[0] = int(ctrl[4]); c2[1] = int(ctrl[5]);
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int c3[2]; c3[0] = int(ctrl[6]); c3[1] = int(ctrl[7]);
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// #### Duplication needed?
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if ( TQABS(c1[0]-c0[0]) <= 1 && TQABS(c1[1]-c0[1]) <= 1
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&& TQABS(c2[0]-c0[0]) <= 1 && TQABS(c2[1]-c0[1]) <= 1
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&& TQABS(c3[0]-c1[0]) <= 1 && TQABS(c3[1]-c0[1]) <= 1 )
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{
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// Approximate by one line.
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// Dont need to write last pt as it is the same as first pt
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// on the next segment
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acc[accsize++] = l[0];
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acc[accsize++] = l[1];
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return;
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}
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if ( ( pnt_on_line( c0, c3, c1 ) == 2 && pnt_on_line( c0, c3, c2 ) == 2 )
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|| ( TQABS(c1[0]-c0[0]) <= 1 && TQABS(c1[1]-c0[1]) <= 1
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&& TQABS(c2[0]-c0[0]) <= 1 && TQABS(c2[1]-c0[1]) <= 1
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&& TQABS(c3[0]-c1[0]) <= 1 && TQABS(c3[1]-c0[1]) <= 1 ) )
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{
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// Approximate by one line.
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// Dont need to write last pt as it is the same as first pt
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// on the next segment
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acc[accsize++] = l[0];
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acc[accsize++] = l[1];
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return;
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}
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// Too big and too curved - recusively subdivide.
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polygonizeTQBezier( acc, accsize, l, maxsize );
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polygonizeTQBezier( acc, accsize, r, maxsize );
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}
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KoRect KoPointArray::boundingRect() const
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{
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if ( isEmpty() )
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return KoRect( 0, 0, 0, 0 ); // null rectangle
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KoPoint *pd = data();
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double minx, maxx, miny, maxy;
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minx = maxx = pd->x();
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miny = maxy = pd->y();
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pd++;
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for ( int i=1; i<(int)size(); i++ ) { // find min+max x and y
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if ( pd->x() < minx )
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minx = pd->x();
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else if ( pd->x() > maxx )
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maxx = pd->x();
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if ( pd->y() < miny )
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miny = pd->y();
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else if ( pd->y() > maxy )
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maxy = pd->y();
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pd++;
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}
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return KoRect( KoPoint(minx,miny), KoPoint(maxx,maxy) );
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}
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KoPointArray KoPointArray::cubicBezier() const
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{
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if ( size() != 4 ) {
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#if defined(TQT_CHECK_RANGE)
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tqWarning( "TQPointArray::bezier: The array must have 4 control points" );
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#endif
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KoPointArray pa;
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return pa;
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} else {
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KoRect r = boundingRect();
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int m = (int)(4+2*TQMAX(r.width(),r.height()));
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double *p = new double[m];
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double ctrl[8];
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int i;
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for (i=0; i<4; i++) {
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ctrl[i*2] = at(i).x();
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ctrl[i*2+1] = at(i).y();
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}
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int len=0;
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polygonizeTQBezier( p, len, ctrl, m );
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KoPointArray pa((len/2)+1); // one extra point for last point on line
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int j=0;
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for (i=0; j<len; i++) {
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double x = tqRound(p[j++]);
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double y = tqRound(p[j++]);
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pa[i] = KoPoint(x,y);
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}
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// add last pt on the line, which will be at the last control pt
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pa[(int)pa.size()-1] = at(3);
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delete[] p;
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return pa;
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}
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}
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TQPointArray KoPointArray::zoomPointArray( const KoZoomHandler* zoomHandler ) const
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{
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TQPointArray tmpPoints(size());
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for ( uint i= 0; i<size();i++ ) {
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KoPoint p = at( i );
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tmpPoints.putPoints( i, 1, zoomHandler->zoomItX(p.x()),zoomHandler->zoomItY(p.y()) );
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}
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return tmpPoints;
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}
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TQPointArray KoPointArray::zoomPointArray( const KoZoomHandler* zoomHandler, int penWidth ) const
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{
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double fx;
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double fy;
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KoSize ext = boundingRect().size();
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int pw = zoomHandler->zoomItX( penWidth ) / 2;
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fx = (double)( zoomHandler->zoomItX(ext.width()) - 2 * pw ) / ext.width();
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fy = (double)( zoomHandler->zoomItY(ext.height()) - 2 * pw ) / ext.height();
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unsigned int index = 0;
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TQPointArray tmpPoints;
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KoPointArray::ConstIterator it;
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for ( it = begin(); it != end(); ++it, ++index ) {
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int tmpX = tqRound((*it).x() * fx + pw);
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int tmpY = tqRound((*it).y() * fy + pw);
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tmpPoints.putPoints( index, 1, tmpX, tmpY );
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}
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return tmpPoints;
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}
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