From 2b3567c83ca18b5dad62be7f10cc71446c028164 Mon Sep 17 00:00:00 2001
From: Matthias Melcher <fltk@matthiasm.com>
Date: Tue, 26 Jan 2016 20:48:21 +0000
Subject: OpenGL new naming scheme.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11055 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 .../OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx      | 70 ++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx

(limited to 'src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx')

diff --git a/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx b/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx
new file mode 100644
index 000000000..15ec4cf36
--- /dev/null
+++ b/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_arci.cxx
@@ -0,0 +1,70 @@
+//
+// "$Id$"
+//
+// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2010 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
+//
+
+#ifndef FL_CFG_GFX_OPENGL_ARCI_CXX
+#define FL_CFG_GFX_OPENGL_ARCI_CXX
+
+/**
+  \file opengl_arci.cxx
+  \brief Utility functions for drawing circles using integers
+*/
+
+#include <FL/gl.h>
+#define _USE_MATH_DEFINES
+#include <math.h>
+
+void Fl_OpenGL_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
+  if (w <= 0 || h <= 0) return;
+  while (a2<a1) a2 += 360.0;  // TODO: write a sensible fmod angle alignment here
+  a1 = a1/180.0f*M_PI; a2 = a2/180.0f*M_PI;
+  double cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
+  double rMax; if (w<h) rMax = h/2; else rMax = w/2;
+  int nSeg = (int)(10 * sqrt(rMax))+1;
+  double incr = (a2-a1)/(double)nSeg;
+
+  glBegin(GL_LINE_STRIP);
+  for (int i=0; i<nSeg; i++) {
+    glVertex2d(cx+cos(a1)*rMax, cy-sin(a1)*rMax);
+    a1 += incr;
+  }
+  glEnd();
+}
+
+void Fl_OpenGL_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
+  if (w <= 0 || h <= 0) return;
+  while (a2<a1) a2 += 360.0;  // TODO: write a sensible fmod angle alignment here
+  a1 = a1/180.0f*M_PI; a2 = a2/180.0f*M_PI;
+  double cx = x + 0.5f*w - 0.5f, cy = y + 0.5f*h - 0.5f;
+  double rMax; if (w<h) rMax = h/2; else rMax = w/2;
+  int nSeg = (int)(10 * sqrt(rMax))+1;
+  double incr = (a2-a1)/(double)nSeg;
+
+  glBegin(GL_TRIANGLE_FAN);
+  glVertex2d(cx, cy);
+  for (int i=0; i<nSeg+1; i++) {
+    glVertex2d(cx+cos(a1)*rMax, cy-sin(a1)*rMax);
+    a1 += incr;
+  }
+  glEnd();
+}
+
+#endif // FL_CFG_GFX_OPENGL_ARCI_CXX
+
+//
+// End of "$Id$".
+//
-- 
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