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//
// "$Id$"
//
// Portable drawing routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
/**
\file Fl_Xlib_Graphics_Driver_vertex.cxx
\brief Portable drawing code for drawing arbitrary shapes with
simple 2D transformations, implemented for X11 Xlib.
*/
#include <config.h>
#include "Fl_Xlib_Graphics_Driver.H"
#include <FL/fl_draw.H>
#include <FL/x.H>
#include <FL/math.h>
void Fl_Xlib_Graphics_Driver::transformed_vertex(double xf, double yf) {
transformed_vertex0(COORD_T(rint(xf)), COORD_T(rint(yf)));
}
void Fl_Xlib_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_Xlib_Graphics_Driver::end_points() {
if (n>1) XDrawPoints(fl_display, fl_window, gc_, p, n, 0);
}
void Fl_Xlib_Graphics_Driver::end_line() {
if (n < 2) {
end_points();
return;
}
if (n>1) XDrawLines(fl_display, fl_window, gc_, p, n, 0);
}
void Fl_Xlib_Graphics_Driver::end_loop() {
fixloop();
if (n>2) transformed_vertex((COORD_T)p[0].x, (COORD_T)p[0].y);
end_line();
}
void Fl_Xlib_Graphics_Driver::end_polygon() {
fixloop();
if (n < 3) {
end_line();
return;
}
if (n>2) XFillPolygon(fl_display, fl_window, gc_, p, n, Convex, 0);
}
void Fl_Xlib_Graphics_Driver::begin_complex_polygon() {
begin_polygon();
gap_ = 0;
}
void Fl_Xlib_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) {
transformed_vertex((COORD_T)p[gap_].x, (COORD_T)p[gap_].y);
gap_ = n;
} else {
n = gap_;
}
}
void Fl_Xlib_Graphics_Driver::end_complex_polygon() {
gap();
if (n < 3) {
end_line();
return;
}
if (n>2) XFillPolygon(fl_display, fl_window, gc_, p, n, 0, 0);
}
// 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_Xlib_Graphics_Driver::circle(double x, double y,double r) {
double xt = transform_x(x,y);
double yt = 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;
(what == POLYGON ? XFillArc : XDrawArc)
(fl_display, fl_window, gc_, llx, lly, w, h, 0, 360*64);
}
//
// End of "$Id$".
//
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