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- //
- // "$Id: fl_vertex.cxx 8621 2011-04-23 15:46:30Z AlbrechtS $"
- //
- // Portable drawing routines for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-2011 by Bill Spitzak and others.
- //
- // This library is free software; you can redistribute it and/or
- // modify it under the terms of the GNU Library General Public
- // License as published by the Free Software Foundation; either
- // version 2 of the License, or (at your option) any later version.
- //
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // Library General Public License for more details.
- //
- // You should have received a copy of the GNU Library General Public
- // License along with this library; if not, write to the Free Software
- // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- // USA.
- //
- // Please report all bugs and problems on the following page:
- //
- // http://www.fltk.org/str.php
- //
-
- /**
- \file fl_vertex.cxx
- \brief Portable drawing code for drawing arbitrary shapes with
- simple 2D transformations.
- */
-
- // Portable drawing code for drawing arbitrary shapes with
- // simple 2D transformations. See also fl_arc.cxx
-
- // matt: the Quartz implementation purposely doesn't use the Quartz matrix
- // operations for reasons of compatibility and maintainability
-
- #include <config.h>
- #include <FL/fl_draw.H>
- #include <FL/x.H>
- #include <FL/Fl.H>
- #include <FL/math.h>
- #include <stdlib.h>
-
- void Fl_Graphics_Driver::push_matrix() {
- if (sptr==matrix_stack_size)
- Fl::error("fl_push_matrix(): matrix stack overflow.");
- else
- stack[sptr++] = m;
- }
-
- void Fl_Graphics_Driver::pop_matrix() {
- if (sptr==0)
- Fl::error("fl_pop_matrix(): matrix stack underflow.");
- else
- m = stack[--sptr];
- }
-
- void Fl_Graphics_Driver::mult_matrix(double a, double b, double c, double d, double x, double y) {
- matrix o;
- o.a = a*m.a + b*m.c;
- o.b = a*m.b + b*m.d;
- o.c = c*m.a + d*m.c;
- o.d = c*m.b + d*m.d;
- o.x = x*m.a + y*m.c + m.x;
- o.y = x*m.b + y*m.d + m.y;
- m = o;
- }
-
- void Fl_Graphics_Driver::rotate(double d) {
- if (d) {
- double s, c;
- if (d == 0) {s = 0; c = 1;}
- else if (d == 90) {s = 1; c = 0;}
- else if (d == 180) {s = 0; c = -1;}
- else if (d == 270 || d == -90) {s = -1; c = 0;}
- else {s = sin(d*M_PI/180); c = cos(d*M_PI/180);}
- mult_matrix(c,-s,s,c,0,0);
- }
- }
-
- void Fl_Graphics_Driver::begin_points() {n = 0; what = POINT_;}
-
- void Fl_Graphics_Driver::begin_line() {n = 0; what = LINE;}
-
- void Fl_Graphics_Driver::begin_loop() {n = 0; what = LOOP;}
-
- void Fl_Graphics_Driver::begin_polygon() {n = 0; what = POLYGON;}
-
- double Fl_Graphics_Driver::transform_x(double x, double y) {return x*m.a + y*m.c + m.x;}
-
- double Fl_Graphics_Driver::transform_y(double x, double y) {return x*m.b + y*m.d + m.y;}
-
- double Fl_Graphics_Driver::transform_dx(double x, double y) {return x*m.a + y*m.c;}
-
- double Fl_Graphics_Driver::transform_dy(double x, double y) {return x*m.b + y*m.d;}
-
- void Fl_Graphics_Driver::transformed_vertex0(COORD_T x, COORD_T y) {
- if (!n || x != p[n-1].x || y != p[n-1].y) {
- if (n >= p_size) {
- p_size = p ? 2*p_size : 16;
- p = (XPOINT*)realloc((void*)p, p_size*sizeof(*p));
- }
- p[n].x = x;
- p[n].y = y;
- n++;
- }
- }
-
- void Fl_Graphics_Driver::transformed_vertex(double xf, double yf) {
- #ifdef __APPLE_QUARTZ__
- transformed_vertex0(COORD_T(xf), COORD_T(yf));
- #else
- transformed_vertex0(COORD_T(rint(xf)), COORD_T(rint(yf)));
- #endif
- }
-
- void Fl_Graphics_Driver::vertex(double x,double y) {
- transformed_vertex0(COORD_T(x*m.a + y*m.c + m.x), COORD_T(x*m.b + y*m.d + m.y));
- }
-
- void Fl_Graphics_Driver::end_points() {
- #if defined(USE_X11)
- if (n>1) XDrawPoints(fl_display, fl_window, fl_gc, p, n, 0);
- #elif defined(WIN32)
- for (int i=0; i<n; i++) SetPixel(fl_gc, p[i].x, p[i].y, fl_RGB());
- #elif defined(__APPLE_QUARTZ__)
- if (fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, true);
- for (int i=0; i<n; i++) {
- CGContextMoveToPoint(fl_gc, p[i].x, p[i].y);
- CGContextAddLineToPoint(fl_gc, p[i].x, p[i].y);
- CGContextStrokePath(fl_gc);
- }
- if (fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, false);
- #else
- # error unsupported platform
- #endif
- }
-
- void Fl_Graphics_Driver::end_line() {
- if (n < 2) {
- fl_end_points();
- return;
- }
- #if defined(USE_X11)
- if (n>1) XDrawLines(fl_display, fl_window, fl_gc, p, n, 0);
- #elif defined(WIN32)
- if (n>1) Polyline(fl_gc, p, n);
- #elif defined(__APPLE_QUARTZ__)
- if (n<=1) return;
- CGContextSetShouldAntialias(fl_gc, true);
- CGContextMoveToPoint(fl_gc, p[0].x, p[0].y);
- for (int i=1; i<n; i++)
- CGContextAddLineToPoint(fl_gc, p[i].x, p[i].y);
- CGContextStrokePath(fl_gc);
- CGContextSetShouldAntialias(fl_gc, false);
- #else
- # error unsupported platform
- #endif
- }
-
- void Fl_Graphics_Driver::fixloop() { // remove equal points from closed path
- while (n>2 && p[n-1].x == p[0].x && p[n-1].y == p[0].y) n--;
- }
-
- void Fl_Graphics_Driver::end_loop() {
- fixloop();
- if (n>2) fl_transformed_vertex((COORD_T)p[0].x, (COORD_T)p[0].y);
- fl_end_line();
- }
-
- void Fl_Graphics_Driver::end_polygon() {
- fixloop();
- if (n < 3) {
- fl_end_line();
- return;
- }
- #if defined(USE_X11)
- if (n>2) XFillPolygon(fl_display, fl_window, fl_gc, p, n, Convex, 0);
- #elif defined(WIN32)
- if (n>2) {
- SelectObject(fl_gc, fl_brush());
- Polygon(fl_gc, p, n);
- }
- #elif defined(__APPLE_QUARTZ__)
- if (n<=1) return;
- CGContextSetShouldAntialias(fl_gc, true);
- CGContextMoveToPoint(fl_gc, p[0].x, p[0].y);
- for (int i=1; i<n; i++)
- CGContextAddLineToPoint(fl_gc, p[i].x, p[i].y);
- CGContextClosePath(fl_gc);
- CGContextFillPath(fl_gc);
- CGContextSetShouldAntialias(fl_gc, false);
- #else
- # error unsupported platform
- #endif
- }
-
- void Fl_Graphics_Driver::begin_complex_polygon() {
- fl_begin_polygon();
- gap_ = 0;
- #if defined(WIN32)
- numcount = 0;
- #endif
- }
-
- void Fl_Graphics_Driver::gap() {
- while (n>gap_+2 && p[n-1].x == p[gap_].x && p[n-1].y == p[gap_].y) n--;
- if (n > gap_+2) {
- fl_transformed_vertex((COORD_T)p[gap_].x, (COORD_T)p[gap_].y);
- #if defined(WIN32)
- counts[numcount++] = n-gap_;
- #endif
- gap_ = n;
- } else {
- n = gap_;
- }
- }
-
- void Fl_Graphics_Driver::end_complex_polygon() {
- fl_gap();
- if (n < 3) {
- fl_end_line();
- return;
- }
- #if defined(USE_X11)
- if (n>2) XFillPolygon(fl_display, fl_window, fl_gc, p, n, 0, 0);
- #elif defined(WIN32)
- if (n>2) {
- SelectObject(fl_gc, fl_brush());
- PolyPolygon(fl_gc, p, counts, numcount);
- }
- #elif defined(__APPLE_QUARTZ__)
- if (n<=1) return;
- CGContextSetShouldAntialias(fl_gc, true);
- CGContextMoveToPoint(fl_gc, p[0].x, p[0].y);
- for (int i=1; i<n; i++)
- CGContextAddLineToPoint(fl_gc, p[i].x, p[i].y);
- CGContextClosePath(fl_gc);
- CGContextFillPath(fl_gc);
- CGContextSetShouldAntialias(fl_gc, false);
- #else
- # error unsupported platform
- #endif
- }
-
- // shortcut the closed circles so they use XDrawArc:
- // warning: these do not draw rotated ellipses correctly!
- // See fl_arc.c for portable version.
-
- void Fl_Graphics_Driver::circle(double x, double y,double r) {
- double xt = fl_transform_x(x,y);
- double yt = fl_transform_y(x,y);
- double rx = r * (m.c ? sqrt(m.a*m.a+m.c*m.c) : fabs(m.a));
- double ry = r * (m.b ? sqrt(m.b*m.b+m.d*m.d) : fabs(m.d));
- int llx = (int)rint(xt-rx);
- int w = (int)rint(xt+rx)-llx;
- int lly = (int)rint(yt-ry);
- int h = (int)rint(yt+ry)-lly;
-
- #if defined(USE_X11)
- (what == POLYGON ? XFillArc : XDrawArc)
- (fl_display, fl_window, fl_gc, llx, lly, w, h, 0, 360*64);
- #elif defined(WIN32)
- if (what==POLYGON) {
- SelectObject(fl_gc, fl_brush());
- Pie(fl_gc, llx, lly, llx+w, lly+h, 0,0, 0,0);
- } else
- Arc(fl_gc, llx, lly, llx+w, lly+h, 0,0, 0,0);
- #elif defined(__APPLE_QUARTZ__)
- // Quartz warning: circle won't scale to current matrix!
- // Last argument must be 0 (counter-clockwise) or it draws nothing under __LP64__ !!!!
- CGContextSetShouldAntialias(fl_gc, true);
- CGContextAddArc(fl_gc, xt, yt, (w+h)*0.25f, 0, 2.0f*M_PI, 0);
- (what == POLYGON ? CGContextFillPath : CGContextStrokePath)(fl_gc);
- CGContextSetShouldAntialias(fl_gc, false);
- #else
- # error unsupported platform
- #endif
- }
-
- //
- // End of "$Id: fl_vertex.cxx 8621 2011-04-23 15:46:30Z AlbrechtS $".
- //
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