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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@798 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart
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/*
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* File: xfspline.cc
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* Purpose:
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* Author: Julian Smart
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* Created: 1993
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* Updated: August 1994
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* RCS_ID: $Id$
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* Copyright: (c) 1993, AIAI, University of Edinburgh
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*/
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// Must be a comment as this file is #include\'d by wb_dc.cc
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/* static const char sccsid[] = "@(#)xfspline.cc 1.3 5/9/94"; */
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/*
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* FIG : Facility for Interactive Generation of figures
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* Copyright (c) 1985 by Supoj Sutanthavibul
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*/
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#if wxUSE_SPLINES
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////#define wx_round(a) (int)((a)+.5)
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//#define wx_round(a) (a)
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class wxSpline: public wxObject
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{
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public:
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int type;
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wxList *points;
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wxSpline(wxList *list);
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void DeletePoints(void);
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// Doesn't delete points
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~wxSpline(void);
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};
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void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
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#if wxUSE_POSTSCRIPT
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void wx_draw_open_spline_ps(wxPostScriptDC *dc, wxSpline *s);
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#endif
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void wx_quadratic_spline(double a1, double b1, double a2, double b2,
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double a3, double b3, double a4, double b4);
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void wx_clear_stack(void);
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int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
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double *y3, double *x4, double *y4);
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void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
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double x4, double y4);
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static bool wx_spline_add_point(double x, double y);
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static void wx_spline_draw_point_array(wxDC *dc);
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wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
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void wxDC::DrawSpline(int n, wxPoint points[])
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{
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wxList list;
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int i;
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for (i =0; i < n; i++)
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list.Append((wxObject*)&points[i]);
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DrawSpline((wxList *)&list);
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}
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void wxDC::DrawSpline(wxList *list)
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{
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wxSpline spline(list);
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wx_draw_open_spline(this, &spline);
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}
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wxList wx_spline_point_list;
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void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
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{
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wxPoint *p;
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double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
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double x1, y1, x2, y2;
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wxNode *node = spline->points->First();
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p = (wxPoint *)node->Data();
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x1 = p->x;
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y1 = p->y;
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node = node->Next();
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p = (wxPoint *)node->Data();
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x2 = p->x;
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y2 = p->y;
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cx1 = (double)((x1 + x2) / 2);
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cy1 = (double)((y1 + y2) / 2);
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cx2 = (double)((cx1 + x2) / 2);
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cy2 = (double)((cy1 + y2) / 2);
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wx_spline_add_point(x1, y1);
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while ((node = node->Next()) != NULL)
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{
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p = (wxPoint *)node->Data();
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x1 = x2;
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y1 = y2;
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x2 = p->x;
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y2 = p->y;
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cx4 = (double)(x1 + x2) / 2;
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cy4 = (double)(y1 + y2) / 2;
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cx3 = (double)(x1 + cx4) / 2;
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cy3 = (double)(y1 + cy4) / 2;
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wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
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cx1 = cx4;
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cy1 = cy4;
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cx2 = (double)(cx1 + x2) / 2;
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cy2 = (double)(cy1 + y2) / 2;
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}
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wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
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wx_spline_add_point(x2, y2);
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wx_spline_draw_point_array(dc);
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}
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#if wxUSE_POSTSCRIPT
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void wx_draw_open_spline_ps(wxPostScriptDC *dc, wxSpline *s)
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{
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double a, b, c, d, x1, y1, x2, y2, x3, y3;
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wxPoint *p, *q;
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wxNode *node = s->points->First();
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p = (wxPoint *)node->Data();
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x1 = p->x; y1 = p->y;
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node = node->Next();
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p = (wxPoint *)node->Data();
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c = p->x; d = p->y;
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x3 = a = (double)(x1 + c) / 2;
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y3 = b = (double)(y1 + d) / 2;
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*(dc->GetStream()) << "newpath " << x1 << " " << dc->GetYOrigin() - y1 << " moveto " << x3 << " " << dc->GetYOrigin() - y3;
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*(dc->GetStream()) << " lineto\n";
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dc->CalcBoundingBox((double)x1, (double)(dc->GetYOrigin() - y1));
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dc->CalcBoundingBox((double)x3, (double)(dc->GetYOrigin() - y3));
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while ((node = node->Next()) != NULL)
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{
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q = (wxPoint *)node->Data();
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x1 = x3; y1 = y3;
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x2 = c; y2 = d;
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c = q->x; d = q->y;
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x3 = (double)(x2 + c) / 2;
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y3 = (double)(y2 + d) / 2;
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*(dc->GetStream()) << x1 << " " << dc->GetYOrigin() - y1 << " " << x2 << " " << dc->GetYOrigin() - y2 << " ";
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*(dc->GetStream()) << x3 << " " << dc->GetYOrigin() - y3 << " DrawSplineSection\n";
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dc->CalcBoundingBox((double)x1, (double)(dc->GetYOrigin() - y1));
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dc->CalcBoundingBox((double)x3, (double)(dc->GetYOrigin() - y3));
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}
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/*
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* At this point, (x2,y2) and (c,d) are the position of the
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* next-to-last and last point respectively, in the point list
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*/
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*(dc->GetStream()) << c << " " << dc->GetYOrigin() - d << " lineto stroke\n";
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}
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#endif
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/********************* CURVES FOR SPLINES *****************************
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The following spline drawing routine is from
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"An Algorithm for High-Speed Curve Generation"
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by George Merrill Chaikin,
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Computer Graphics and Image Processing, 3, Academic Press,
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1974, 346-349.
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and
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"On Chaikin's Algorithm" by R. F. Riesenfeld,
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Computer Graphics and Image Processing, 4, Academic Press,
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1975, 304-310.
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***********************************************************************/
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#define half(z1, z2) ((z1+z2)/2.0)
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#define THRESHOLD 5
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/* iterative version */
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void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
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double b4)
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{
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register double xmid, ymid;
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double x1, y1, x2, y2, x3, y3, x4, y4;
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wx_clear_stack();
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wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
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while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
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xmid = (double)half(x2, x3);
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ymid = (double)half(y2, y3);
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if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
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fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
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wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
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wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
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} else {
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wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
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(double)half(x3, x4), (double)half(y3, y4), x4, y4);
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wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
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(double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
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}
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}
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}
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/* utilities used by spline drawing routines */
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typedef struct wx_spline_stack_struct {
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double x1, y1, x2, y2, x3, y3, x4, y4;
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}
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Stack;
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#define SPLINE_STACK_DEPTH 20
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static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
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static Stack *wx_stack_top;
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static int wx_stack_count;
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void wx_clear_stack(void)
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{
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wx_stack_top = wx_spline_stack;
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wx_stack_count = 0;
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}
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void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
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{
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wx_stack_top->x1 = x1;
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wx_stack_top->y1 = y1;
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wx_stack_top->x2 = x2;
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wx_stack_top->y2 = y2;
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wx_stack_top->x3 = x3;
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wx_stack_top->y3 = y3;
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wx_stack_top->x4 = x4;
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wx_stack_top->y4 = y4;
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wx_stack_top++;
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wx_stack_count++;
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}
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int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
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double *x3, double *y3, double *x4, double *y4)
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{
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if (wx_stack_count == 0)
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return (0);
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wx_stack_top--;
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wx_stack_count--;
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*x1 = wx_stack_top->x1;
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*y1 = wx_stack_top->y1;
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*x2 = wx_stack_top->x2;
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*y2 = wx_stack_top->y2;
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*x3 = wx_stack_top->x3;
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*y3 = wx_stack_top->y3;
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*x4 = wx_stack_top->x4;
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*y4 = wx_stack_top->y4;
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return (1);
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}
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static bool wx_spline_add_point(double x, double y)
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{
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wxPoint *point = new wxPoint ;
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point->x = (int) x;
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point->y = (int) y;
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wx_spline_point_list.Append((wxObject*)point);
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return TRUE;
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}
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static void wx_spline_draw_point_array(wxDC *dc)
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{
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dc->DrawLines(&wx_spline_point_list, (double)0.0, (double)0.0);
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wxNode *node = wx_spline_point_list.First();
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while (node)
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{
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wxPoint *point = (wxPoint *)node->Data();
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delete point;
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delete node;
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node = wx_spline_point_list.First();
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}
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}
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wxSpline::wxSpline(wxList *list)
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{
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points = list;
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}
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wxSpline::~wxSpline(void)
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{
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}
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void wxSpline::DeletePoints(void)
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{
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for(wxNode *node = points->First(); node; node = points->First())
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{
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wxPoint *point = (wxPoint *)node->Data();
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delete point;
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delete node;
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}
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delete points;
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}
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#if wxUSE_POSTSCRIPT
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// Make a 3-point spline
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void wxPostScriptDC::DrawSpline(long x1, long y1, long x2, long y2, long x3, long y3)
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{
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wxList *point_list = new wxList;
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wxPoint *point1 = new wxPoint;
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point1->x = x1; point1->y = y1;
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point_list->Append((wxObject*)point1);
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wxPoint *point2 = new wxPoint;
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point2->x = x2; point2->y = y2;
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point_list->Append((wxObject*)point2);
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wxPoint *point3 = new wxPoint;
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point3->x = x3; point3->y = y3;
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point_list->Append((wxObject*)point3);
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wxSpline spline(point_list);
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wx_draw_open_spline_ps(this, &spline);
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spline.DeletePoints();
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}
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void wxPostScriptDC::DrawSpline(wxList *list)
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{
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wxSpline spline(list);
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wx_draw_open_spline_ps(this, &spline);
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}
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void wxPostScriptDC::DrawSpline(int n, wxPoint points[])
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{
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wxList list;
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int i;
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for (i =0; i < n; i++)
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list.Append((wxObject*)&points[i]);
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DrawSpline((wxList *)&list);
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}
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#endif // wxUSE_POSTSCRIPT
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#endif // wxUSE_SPLINES
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