915d6c643a
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11432 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
//
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// "$Id$"
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//
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// Portable drawing routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2016 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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/**
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\file Fl_Xlib_Graphics_Driver_vertex.cxx
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\brief Portable drawing code for drawing arbitrary shapes with
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simple 2D transformations, implemented for X11 Xlib.
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*/
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#include <config.h>
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#include "Fl_Xlib_Graphics_Driver.H"
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#include <FL/fl_draw.H>
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#include <FL/x.H>
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#include <FL/math.h>
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void Fl_Xlib_Graphics_Driver::transformed_vertex(double xf, double yf) {
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transformed_vertex0(short(rint(xf)), short(rint(yf)));
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}
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void Fl_Xlib_Graphics_Driver::vertex(double x,double y) {
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transformed_vertex0(short(x*m.a + y*m.c + m.x), short(x*m.b + y*m.d + m.y));
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}
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void Fl_Xlib_Graphics_Driver::end_points() {
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if (n>1) XDrawPoints(fl_display, fl_window, gc_, (XPoint*)p, n, 0);
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}
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void Fl_Xlib_Graphics_Driver::end_line() {
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if (n < 2) {
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end_points();
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return;
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}
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if (n>1) XDrawLines(fl_display, fl_window, gc_, (XPoint*)p, n, 0);
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}
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void Fl_Xlib_Graphics_Driver::end_loop() {
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fixloop();
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if (n>2) transformed_vertex((short)p[0].x, (short)p[0].y);
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end_line();
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}
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void Fl_Xlib_Graphics_Driver::end_polygon() {
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fixloop();
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if (n < 3) {
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end_line();
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return;
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}
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if (n>2) XFillPolygon(fl_display, fl_window, gc_, (XPoint*)p, n, Convex, 0);
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}
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void Fl_Xlib_Graphics_Driver::begin_complex_polygon() {
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begin_polygon();
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gap_ = 0;
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}
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void Fl_Xlib_Graphics_Driver::gap() {
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while (n>gap_+2 && p[n-1].x == p[gap_].x && p[n-1].y == p[gap_].y) n--;
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if (n > gap_+2) {
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transformed_vertex((short)p[gap_].x, (short)p[gap_].y);
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gap_ = n;
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} else {
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n = gap_;
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}
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}
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void Fl_Xlib_Graphics_Driver::end_complex_polygon() {
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gap();
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if (n < 3) {
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end_line();
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return;
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}
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if (n>2) XFillPolygon(fl_display, fl_window, gc_, (XPoint*)p, n, 0, 0);
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}
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// shortcut the closed circles so they use XDrawArc:
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// warning: these do not draw rotated ellipses correctly!
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// See fl_arc.c for portable version.
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void Fl_Xlib_Graphics_Driver::circle(double x, double y,double r) {
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double xt = transform_x(x,y);
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double yt = transform_y(x,y);
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double rx = r * (m.c ? sqrt(m.a*m.a+m.c*m.c) : fabs(m.a));
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double ry = r * (m.b ? sqrt(m.b*m.b+m.d*m.d) : fabs(m.d));
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int llx = (int)rint(xt-rx);
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int w = (int)rint(xt+rx)-llx;
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int lly = (int)rint(yt-ry);
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int h = (int)rint(yt+ry)-lly;
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(what == POLYGON ? XFillArc : XDrawArc)
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(fl_display, fl_window, gc_, llx, lly, w, h, 0, 360*64);
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}
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//
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// End of "$Id$".
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//
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