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-rw-r--r--tkblt/generic/tkbltGrMisc.C335
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diff --git a/tkblt/generic/tkbltGrMisc.C b/tkblt/generic/tkbltGrMisc.C
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-/*
- * Smithsonian Astrophysical Observatory, Cambridge, MA, USA
- * This code has been modified under the terms listed below and is made
- * available under the same terms.
- */
-
-/*
- * Copyright 1993-2004 George A Howlett.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include <limits.h>
-#include <float.h>
-#include <string.h>
-#include <stdlib.h>
-
-#include <cmath>
-
-#include <tk.h>
-#include <tkInt.h>
-
-#include "tkbltGraph.h"
-#include "tkbltGrMisc.h"
-
-using namespace Blt;
-
-char* Blt::dupstr(const char* str)
-{
- char* copy =NULL;
- if (str) {
- copy=new char[strlen(str)+1];
- strcpy(copy,str);
- }
-
- return copy;
-}
-
-int Blt::pointInPolygon(Point2d *s, Point2d *points, int nPoints)
-{
- int count = 0;
- for (Point2d *p=points, *q=p+1, *qend=p + nPoints; q < qend; p++, q++) {
- if (((p->y <= s->y) && (s->y < q->y)) ||
- ((q->y <= s->y) && (s->y < p->y))) {
- double b;
-
- b = (q->x - p->x) * (s->y - p->y) / (q->y - p->y) + p->x;
- if (s->x < b) {
- count++; /* Count the number of intersections. */
- }
- }
- }
- return (count & 0x01);
-}
-
-static int ClipTest (double ds, double dr, double *t1, double *t2)
-{
- double t;
-
- if (ds < 0.0) {
- t = dr / ds;
- if (t > *t2) {
- return 0;
- }
- if (t > *t1) {
- *t1 = t;
- }
- } else if (ds > 0.0) {
- t = dr / ds;
- if (t < *t1) {
- return 0;
- }
- if (t < *t2) {
- *t2 = t;
- }
- } else {
- /* d = 0, so line is parallel to this clipping edge */
- if (dr < 0.0) { /* Line is outside clipping edge */
- return 0;
- }
- }
- return 1;
-}
-
-/*
- *---------------------------------------------------------------------------
- * Clips the given line segment to a rectangular region. The coordinates
- * of the clipped line segment are returned. The original coordinates
- * are overwritten.
- *
- * Reference:
- * Liang, Y-D., and B. Barsky, A new concept and method for
- * Line Clipping, ACM, TOG,3(1), 1984, pp.1-22.
- *---------------------------------------------------------------------------
- */
-int Blt::lineRectClip(Region2d* regionPtr, Point2d *p, Point2d *q)
-{
- double t1, t2;
- double dx, dy;
-
- t1 = 0.0, t2 = 1.0;
- dx = q->x - p->x;
- if ((ClipTest (-dx, p->x - regionPtr->left, &t1, &t2)) &&
- (ClipTest (dx, regionPtr->right - p->x, &t1, &t2))) {
- dy = q->y - p->y;
- if ((ClipTest (-dy, p->y - regionPtr->top, &t1, &t2)) &&
- (ClipTest (dy, regionPtr->bottom - p->y, &t1, &t2))) {
- if (t2 < 1.0) {
- q->x = p->x + t2 * dx;
- q->y = p->y + t2 * dy;
- }
- if (t1 > 0.0) {
- p->x += t1 * dx;
- p->y += t1 * dy;
- }
- return 1;
- }
- }
- return 0;
-}
-
-/*
- *---------------------------------------------------------------------------
- * Clips the given polygon to a rectangular region. The resulting
- * polygon is returned. Note that the resulting polyon may be complex,
- * connected by zero width/height segments. The drawing routine (such as
- * XFillPolygon) will not draw a connecting segment.
- *
- * Reference:
- * Liang Y. D. and Brian A. Barsky, "Analysis and Algorithm for
- * Polygon Clipping", Communications of ACM, Vol. 26,
- * p.868-877, 1983
- *---------------------------------------------------------------------------
- */
-#define AddVertex(vx, vy) r->x=(vx), r->y=(vy), r++, count++
-#define LastVertex(vx, vy) r->x=(vx), r->y=(vy), count++
-
-int Blt::polyRectClip(Region2d *regionPtr, Point2d *points, int nPoints,
- Point2d *clipPts)
-{
- Point2d* r = clipPts;
- // Counts # of vertices in output polygon.
- int count = 0;
-
- points[nPoints] = points[0];
- for (Point2d *p=points, *q=p+1, *pend=p+nPoints; p<pend; p++, q++) {
- double dx, dy;
- double tin1, tin2, tinx, tiny;
- double xin, yin, xout, yout;
-
- dx = q->x - p->x; /* X-direction */
- dy = q->y - p->y; /* Y-direction */
-
- if (fabs(dx) < FLT_EPSILON)
- dx = (p->x > regionPtr->left) ? -FLT_EPSILON : FLT_EPSILON ;
-
- if (fabs(dy) < FLT_EPSILON)
- dy = (p->y > regionPtr->top) ? -FLT_EPSILON : FLT_EPSILON ;
-
- if (dx > 0.0) { /* Left */
- xin = regionPtr->left;
- xout = regionPtr->right + 1.0;
- }
- else { /* Right */
- xin = regionPtr->right + 1.0;
- xout = regionPtr->left;
- }
- if (dy > 0.0) { /* Top */
- yin = regionPtr->top;
- yout = regionPtr->bottom + 1.0;
- }
- else { /* Bottom */
- yin = regionPtr->bottom + 1.0;
- yout = regionPtr->top;
- }
-
- tinx = (xin - p->x) / dx;
- tiny = (yin - p->y) / dy;
-
- if (tinx < tiny) { /* Hits x first */
- tin1 = tinx;
- tin2 = tiny;
- }
- else { /* Hits y first */
- tin1 = tiny;
- tin2 = tinx;
- }
-
- if (tin1 <= 1.0) {
- if (tin1 > 0.0) {
- AddVertex(xin, yin);
- }
- if (tin2 <= 1.0) {
- double toutx = (xout - p->x) / dx;
- double touty = (yout - p->y) / dy;
- double tout1 = MIN(toutx, touty);
-
- if ((tin2 > 0.0) || (tout1 > 0.0)) {
- if (tin2 <= tout1) {
- if (tin2 > 0.0) {
- if (tinx > tiny) {
- AddVertex(xin, p->y + tinx * dy);
- } else {
- AddVertex(p->x + tiny * dx, yin);
- }
- }
- if (tout1 < 1.0) {
- if (toutx < touty) {
- AddVertex(xout, p->y + toutx * dy);
- } else {
- AddVertex(p->x + touty * dx, yout);
- }
- } else {
- AddVertex(q->x, q->y);
- }
- } else {
- if (tinx > tiny) {
- AddVertex(xin, yout);
- } else {
- AddVertex(xout, yin);
- }
-
- }
- }
- }
- }
- }
- if (count > 0) {
- LastVertex(clipPts[0].x, clipPts[0].y);
- }
- return count;
-}
-
-/*
- *---------------------------------------------------------------------------
- * Computes the projection of a point on a line. The line (given by two
- * points), is assumed the be infinite.
- *
- * Compute the slope (angle) of the line and rotate it 90 degrees. Using
- * the slope-intercept method (we know the second line from the sample
- * test point and the computed slope), then find the intersection of both
- * lines. This will be the projection of the sample point on the first
- * line.
- *---------------------------------------------------------------------------
- */
-Point2d Blt::getProjection(int x, int y, Point2d *p, Point2d *q)
-{
- double dx = p->x - q->x;
- double dy = p->y - q->y;
-
- /* Test for horizontal and vertical lines */
- Point2d t;
- if (fabs(dx) < DBL_EPSILON) {
- t.x = p->x;
- t.y = (double)y;
- }
- else if (fabs(dy) < DBL_EPSILON) {
- t.x = (double)x;
- t.y = p->y;
- }
- else {
- /* Compute the slope and intercept of PQ. */
- double m1 = (dy / dx);
- double b1 = p->y - (p->x * m1);
-
- /*
- * Compute the slope and intercept of a second line segment: one that
- * intersects through sample X-Y coordinate with a slope perpendicular
- * to original line.
- */
-
- /* Find midpoint of PQ. */
- double midX = (p->x + q->x) * 0.5;
- double midY = (p->y + q->y) * 0.5;
-
- /* Rotate the line 90 degrees */
- double ax = midX - (0.5 * dy);
- double ay = midY - (0.5 * -dx);
- double bx = midX + (0.5 * dy);
- double by = midY + (0.5 * -dx);
-
- double m2 = (ay - by) / (ax - bx);
- double b2 = y - (x * m2);
-
- /*
- * Given the equations of two lines which contain the same point,
- *
- * y = m1 * x + b1
- * y = m2 * x + b2
- *
- * solve for the intersection.
- *
- * x = (b2 - b1) / (m1 - m2)
- * y = m1 * x + b1
- *
- */
-
- t.x = (b2 - b1) / (m1 - m2);
- t.y = m1 * t.x + b1;
- }
-
- return t;
-}
-
-Graph* Blt::getGraphFromWindowData(Tk_Window tkwin)
-{
- while (tkwin) {
- TkWindow* winPtr = (TkWindow*)tkwin;
- if (winPtr->instanceData != NULL) {
- Graph* graphPtr = (Graph*)winPtr->instanceData;
- if (graphPtr)
- return graphPtr;
- }
- tkwin = Tk_Parent(tkwin);
- }
- return NULL;
-}
-
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