db0a1f4bae
* Fix build system for unites, * Updated unittest to check OpenGL drawing. Making sure that OpenGL drawing is exactly the same as native drawing to make FLTK widget rendering look the same in GL windows. * Make OpenGL optional. * Implemented clipping in OpenGL * unites drawing fast shapes * Fixed CMake * Updating unittest. Added tests for fl_pi and fl_arc (int) Renamed tab to render complex shapes. * Improved OpenGL FLTK drawing emulation. * Fixed GTK ROUND DOWN BOX * Fixing Makefile for unittest * Correctly aligning OpenGL text. * Fixed text alignment in GL windows. Explained the "FLTK over GL " example in Cube. * Overlapping test. * Better GL graphics alignment. * Drawing the focus rect. * Adding Alpha Channel support for GL. * Added FLTK-on-GL documentation.
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
//
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// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 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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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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/**
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\file Fl_OpenGL_Graphics_Driver_arci.cxx
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\brief Utility functions for drawing circles using integers
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*/
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#include <config.h>
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#include "Fl_OpenGL_Graphics_Driver.H"
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#include <FL/gl.h>
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#include <FL/Fl_Gl_Window.H>
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#include <FL/Fl_RGB_Image.H>
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#include <FL/Fl.H>
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#include <FL/fl_draw.H>
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#define _USE_MATH_DEFINES
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#include <FL/math.h>
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void Fl_OpenGL_Graphics_Driver::arc(int x,int y,int w,int h,double a1,double a2) {
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if (w <= 0 || h <= 0) return;
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while (a2<a1) a2 += 360.0; // TODO: write a sensible fmod angle alignment here
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a1 = a1/180.0*M_PI; a2 = a2/180.0*M_PI;
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double cx = x + 0.5*w, cy = y + 0.5*h;
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double rx = 0.5*w-0.3, ry = 0.5*h-0.3;
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double rMax; if (w>h) rMax = rx; else rMax = ry;
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int nSeg = (int)(10 * sqrt(rMax))+1;
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double incr = (a2-a1)/(double)nSeg;
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glBegin(GL_LINE_STRIP);
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for (int i=0; i<=nSeg; i++) {
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glVertex2d(cx+cos(a1)*rx, cy-sin(a1)*ry);
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a1 += incr;
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}
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glEnd();
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}
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void Fl_OpenGL_Graphics_Driver::arc(double x, double y, double r, double start, double end) {
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Fl_Graphics_Driver::arc(x, y, r, start, end);
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}
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void Fl_OpenGL_Graphics_Driver::pie(int x,int y,int w,int h,double a1,double a2) {
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if (w <= 0 || h <= 0) return;
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while (a2<a1) a2 += 360.0; // TODO: write a sensible fmod angle alignment here
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a1 = a1/180.0*M_PI; a2 = a2/180.0*M_PI;
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double cx = x + 0.5*w, cy = y + 0.5*h;
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double rx = 0.5*w, ry = 0.5*h;
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double rMax; if (w>h) rMax = rx; else rMax = ry;
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int nSeg = (int)(10 * sqrt(rMax))+1;
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double incr = (a2-a1)/(double)nSeg;
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glBegin(GL_TRIANGLE_FAN);
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glVertex2d(cx, cy);
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for (int i=0; i<=nSeg; i++) {
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glVertex2d(cx+cos(a1)*rx, cy-sin(a1)*ry);
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a1 += incr;
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}
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glEnd();
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}
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