Allow moving C=A+B.i in the complex plan with [SHIFT+ARROWs] for the Julia set

README.md

@@ -11,6 +11,7 @@ Both Mandelbrot - *named as per Benoît MANDELBROT (1924-2010)* - and Julia - *n
 ##  What can we do ?
 
 Control keys are :
+
 [**EXIT**] to leave to the Operating System
 [**F1**] to [**F4**] to show/switch off some informations on the screen :
  - [ ] [F1] : hide everything
@@ -24,4 +25,13 @@ Control keys are :
  - [ ] [OPTN] : set resolution scale to 1, the fractals are computed on a 396x224 grid
  - [ ] [VARS] : set resolution scale to 0.5 (2x2 pixels), the fractals are computed on a 198x112 grid (much faster but lower quality)
 
-  Have fun !!!
+For the Julia set only :
+[**SHIFT**]+[**Directional Cross**] : change the value of the C value (`C = A + B i`)
+ - [ ] [**SHIFT+LEFT**] : A = A - 0.002
+ - [ ] [**SHIFT+RIGHT**] : A = A + 0.002
+ - [ ] [**SHIFT+DOWN**] : B = B - 0.002
+ - [ ] [**SHIFT+UP**] : B = B + 0.002
+A and B are constrained in the range [-2.000 .. 2.000]
+
+
+Have fun !!!

src/fractalshaders.h

@@ -6,7 +6,7 @@ void azrp_mandelbrot_init( void );
 void azrp_mandelbrot_close( void );
 void azrp_mandelbrot_USBDEBUG( void );
 
-void azrp_julia( void );
+void azrp_julia( float cr, float ci );
 void azrp_julia_init( void );
 void azrp_julia_close( void );
 void azrp_julia_USBDEBUG( void );

src/juliashader.cpp

@@ -58,12 +58,14 @@ struct command {
     libnum::num xmax;
     libnum::num ymin;
     libnum::num ymax;
+    libnum::num cr;
+    libnum::num ci;
     libnum::num xinc;
     libnum::num yinc;
 };
 
 
-void azrp_julia( void )
+void azrp_julia( float cr, float ci )
 {
     prof_enter(azrp_perf_cmdgen);
 
@@ -77,6 +79,9 @@ void azrp_julia( void )
     cmd.ymax = libnum::num(1.12f);
     cmd.xinc = libnum::num((2*1.98f)/azrp_width);
     cmd.yinc = libnum::num((2*1.12f)/azrp_height);
+    cmd.cr = libnum::num(cr);
+    cmd.ci = libnum::num(ci);
+
     int fragmin = 0;
     int fragcount = (azrp_height >> 4) + 1;
 
@@ -84,9 +89,6 @@ void azrp_julia( void )
     prof_leave(azrp_perf_cmdgen);
 }
 
-extern "C" {
-    extern int julia(int32_t cr, int32_t ci, uint32_t t_squared, int steps, int32_t zr, int32_t zi);
-}
 
 void azrp_shader_julia( void *uniforms, void *comnd, void *fragment )
 {
@@ -98,8 +100,8 @@ void azrp_shader_julia( void *uniforms, void *comnd, void *fragment )
     libnum::num zr, zr2;
     libnum::num zi, zi2;
 
-    libnum::num cr = libnum::num(-0.480f);
-    libnum::num ci = libnum::num(0.600f);
+    libnum::num cr = cmd->cr;
+    libnum::num ci = cmd->ci;
 
     libnum::num zrsave = cmd->xmin;
     libnum::num zisave = cmd->ymax - libnum::num(cmd->current_frag*16)*cmd->yinc;

src/main.cpp

@@ -35,6 +35,7 @@ int SCALE_PIXEL=2;
 uint8_t texttodraw=2;
 
 uint8_t Mandel_Julia_Switch = 1;
+float Cr, Ci;
 
 
 void do_nothing( void )
@@ -56,7 +57,7 @@ static void get_inputs( void  )
 
     }
 
-    if(keydown(KEY_SHIFT)) { }
+
 
     if(keydown(KEY_EXIT)) {exitToOS = true; };
 
@@ -90,6 +91,26 @@ static void get_inputs( void  )
         azrp_julia_init();
     };
 
+    if(Mandel_Julia_Switch==2)
+    {
+        if(keydown(KEY_SHIFT) && keydown(KEY_LEFT))
+        {
+            if(Cr>-2.0f) Cr-=0.002;
+        }
+        else if(keydown(KEY_SHIFT) && keydown(KEY_RIGHT))
+        {
+            if(Cr<2.0f) Cr+=0.002;
+        }
+        else if(keydown(KEY_SHIFT) && keydown(KEY_DOWN))
+        {
+            if(Ci>-2.0f) Ci-=0.002;
+        }
+        else if(keydown(KEY_SHIFT) && keydown(KEY_UP))
+        {
+            if(Ci<2.0f) Ci+=0.002;
+        }
+    }
+
     if(keydown(KEY_F1))   {texttodraw=0;}
     if(keydown(KEY_F2))   {texttodraw=1;}
     if(keydown(KEY_F3))   {texttodraw=2;}
@@ -101,6 +122,10 @@ static void get_inputs( void  )
 
 int main(void)
 {
+
+    Cr = -0.480f;
+    Ci = 0.600f;
+
 	exitToOS = false;
 	float elapsedTime = 0.0f;
 
@@ -153,10 +178,11 @@ int main(void)
 				azrp_clear( C_BLACK );
 
                 if (Mandel_Julia_Switch==1) azrp_mandelbrot();
-                else if(Mandel_Julia_Switch==2) azrp_julia();
+                else if(Mandel_Julia_Switch==2) azrp_julia(Cr,Ci);
                 else do_nothing();
 
                 if (texttodraw>=1) Azur_draw_text(1,01, "  FPS  = %.0f - Render = %.0f", (float) (1000000.0f / elapsedTime), (float) time_render / 1000.0f );
+                if (texttodraw>=1 && Mandel_Julia_Switch==2) Azur_draw_text(1,11, "  Cr  = %.3f - Ci = %.3f", Cr, Ci );
                 if (texttodraw>=2) Azur_draw_text(1,31, "Update = %.0f mc secs", (float) time_update );
                 if (texttodraw>=2) Azur_draw_text(1,41, "Render = %.0f mc secs", (float) time_render );
                 if (texttodraw>=2) Azur_draw_text(1,51, ">Total = %.3f ml secs", (float) elapsedTime / 1000.0f );

src/mandelbrotshader.cpp

@@ -84,9 +84,6 @@ void azrp_mandelbrot( void )
     prof_leave(azrp_perf_cmdgen);
 }
 
-extern "C" {
-    extern int mandelbrot(int32_t cr, int32_t ci, uint32_t t_squared, int steps);
-}
 
 void azrp_shader_mandelbrot( void *uniforms, void *comnd, void *fragment )
 {