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//
// Arc (integer) drawing functions for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 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:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
/**
\file Fl_GDI_Graphics_Driver_arci.cxx
\brief Utility functions for drawing circles using integers
*/
// "integer" circle drawing functions. These draw the limited
// circle types provided by X and NT graphics. The advantage of
// these is that small ones draw quite nicely (probably due to stored
// hand-drawn bitmaps of small circles!) and may be implemented by
// hardware and thus are fast.
#include "Fl_GDI_Graphics_Driver.H"
#include <FL/math.h>
#include <FL/platform.H>
void Fl_GDI_Graphics_Driver::arc_unscaled(int x, int y, int w, int h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
w++; h++;
int xa = int( x+w/2+int(w*cos(a1/180.0*M_PI)) );
int ya = int( y+h/2-int(h*sin(a1/180.0*M_PI)) );
int xb = int( x+w/2+int(w*cos(a2/180.0*M_PI)) );
int yb = int( y+h/2-int(h*sin(a2/180.0*M_PI)) );
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) SetPixel(gc_, xa, ya, fl_RGB());
else Arc(gc_, int(x), int(y), int(x+w), int(y+h), xa, ya, xb, yb);
} else Arc(gc_, int(x), int(y), int(x+w), int(y+h), xa, ya, xb, yb);
}
void Fl_GDI_Graphics_Driver::pie_unscaled(int x, int y, int w, int h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
if (a1 == a2) return;
x++; y++; w--; h--;
if (scale() >= 3) {x++; y++; w-=2; h-=2;}
int xa = int( x+w/2+int(w*cos(a1/180.0*M_PI)) );
int ya = int( y+h/2-int(h*sin(a1/180.0*M_PI)) );
int xb = int( x+w/2+int(w*cos(a2/180.0*M_PI)) );
int yb = int( y+h/2-int(h*sin(a2/180.0*M_PI)) );
SelectObject(gc_, fl_brush());
if (fabs(a1 - a2) < 90) {
if (xa == xb && ya == yb) {
MoveToEx(gc_, int(x+w/2), int(y+h/2), 0L);
LineTo(gc_, xa, ya);
SetPixel(gc_, xa, ya, fl_RGB());
} else Pie(gc_, int(x), int(y), int(x+w), int(y+h), xa, ya, xb, yb);
} else Pie(gc_, int(x), int(y), int(x+w), int(y+h), xa, ya, xb, yb);
}
#if USE_GDIPLUS
void Fl_GDIplus_Graphics_Driver::arc_unscaled(int x, int y, int w, int h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
if (!active) return Fl_GDI_Graphics_Driver::arc_unscaled(x, y, w, h, a1, a2);
Gdiplus::Graphics graphics_(gc_);
pen_->SetColor(gdiplus_color_);
Gdiplus::REAL oldw = pen_->GetWidth();
Gdiplus::REAL new_w = (line_width_ <= scale() ? 1 : line_width_) * scale();
pen_->SetWidth(new_w);
graphics_.SetSmoothingMode(Gdiplus::SmoothingModeAntiAlias);
graphics_.DrawArc(pen_, x, y, w, h, Gdiplus::REAL(-a1), Gdiplus::REAL(a1-a2));
pen_->SetWidth(oldw);
}
void Fl_GDIplus_Graphics_Driver::pie_unscaled(int x, int y, int w, int h, double a1, double a2) {
if (w <= 0 || h <= 0) return;
if (!active) return Fl_GDI_Graphics_Driver::pie_unscaled(x, y, w, h, a1, a2);
Gdiplus::Graphics graphics_(gc_);
brush_->SetColor(gdiplus_color_);
graphics_.SetSmoothingMode(Gdiplus::SmoothingModeAntiAlias);
graphics_.FillPie(brush_, x, y, w, h, Gdiplus::REAL(-a1), Gdiplus::REAL(a1-a2));
}
#endif
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