Adding color to test/mandelbrot (#634)

1 files changed, 13 insertions, 4 deletions

diff --git a/test/mandelbrot.h b/test/mandelbrot.h
index 023fa0d73..b946232f5 100644
--- a/test/mandelbrot.h
+++ b/test/mandelbrot.h
@@ -1,7 +1,7 @@
 //
 // Mandelbrot set header file for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2010 by Bill Spitzak and others.
+// Copyright 1998-2023 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
@@ -20,11 +20,15 @@
 #include <FL/Fl_Double_Window.H>
 #include <FL/Fl_Input.H>
 
+#define USE_COLORS 0 // change to 1 to start in color mode
+
 class Drawing_Area : public Fl_Box {
   void draw() FL_OVERRIDE;
 public:
   uchar *buffer;
+  int use_colors;
   int W,H;
+  int dx, dy, dw, dh; // drawing box offsets
   int nextline;
   int drawn;
   int julia;
@@ -37,23 +41,28 @@ public:
   int handle(int) FL_OVERRIDE;
   void resize(int,int,int,int) FL_OVERRIDE;
   void new_display();
+  void new_buffer();
   enum {
     MAX_BRIGHTNESS = 16,
     DEFAULT_BRIGHTNESS = 16,
+    DEFAULT_BRIGHTNESS_COLOR = 8,
     MAX_ITERATIONS = 14,
     DEFAULT_ITERATIONS = 7
   };
   Drawing_Area(int x,int y,int w,int h) : Fl_Box(x,y,w,h) {
     buffer = 0;
-    W = w-6;
-    H = h-8;
+    use_colors = USE_COLORS;
+    W = w;
+    H = h;
+    dx = dy = 0; // NOTE: as the box type is set *after* the constructor
+    dw = dh = 0; //       the actual offsets are determined in draw()
     nextline = 0;
     drawn = 0;
     julia = 0;
     X = Y = 0;
     scale = 4.0;
     iterations = 1<<DEFAULT_ITERATIONS;
-    brightness = DEFAULT_BRIGHTNESS;
+    brightness = use_colors ? DEFAULT_BRIGHTNESS_COLOR : DEFAULT_BRIGHTNESS;
   }
   int idle();
 };