Update README.md

Gradient options

README.md

@@ -22,13 +22,17 @@ $ paru -S lavat-git
 ```
 Usage: lavat [OPTIONS]
 OPTIONS:
-  -c <COLOR>          Set color. Available colours: red, blue, yellow, green, cyan, magenta, white and black.
+  -g                  Enable gradient mode with truecolor support.
+                      Changes how -c and -k options work.
+  -c <COLOR>          Set color. In normal mode, available colors are: red, blue, yellow, green, cyan, magenta, white, and black.
+                      In gradient mode (-g), use hex format: RRGGBB (e.g., FF0000 for red).
+  -k <COLOR>          Set the rim color. Same format options as -c.
+                      In gradient mode, this sets the second color for the gradient.
   -s <SPEED>          Set the speed, from 1 to 10. (default 5)
   -r <RADIUS>         Set the radius of the metaballs, from 1 to 10. (default: 5)
   -R <RIM>            Set a rim for each metaball, sizes from 1 to 5.(default: none)
                       This option does not work with the default color
                       If you use Kitty or Alacritty you must use it with the -k option to see the rim.
-  -k <COLOR>          Set the color of the rim if there is one. Available colours: red, blue, yellow, green, cyan, magenta, white and black.
   -b <NBALLS>         Set the number of metaballs in the simulation, from 5 to 20. (default: 10)
   -F <CHARS>          Allows for a custom set of chars to be used
                       Only ascii symbols are supported for now, wide/unicode chars may appear broken.
@@ -49,6 +53,9 @@ RUNTIME CONTROLS:
   -                   Decrease speed.
   p                   TURN ON THE PARTY AND CYCLE THROUGH THE PARTY MODES (it can also turns off the party).
 (Tip: Zoom out in your terminal before running the program to get a better resolution of the lava).
+EXAMPLES:
+  lavat -c green -k red        Use named colors in normal mode
+  lavat -g -c 00FF00 -k FF0000 Use hex colors in gradient mode
 ```
 
 ## Demo

lavat.c

@@ -1,4 +1,6 @@
 #define TB_IMPL
+#define TB_LIB_OPTS
+#define TB_OPT_TRUECOLOR
 
 #include "termbox.h"
 #include <stdio.h>
@@ -6,6 +8,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <float.h>
 
 #define MIN_NBALLS 5
 #define MAX_NBALLS 20
@@ -17,6 +20,12 @@ typedef struct {
   int dy;
 } Ball;
 
+uintattr_t pallete[11];
+int baseColor[3];
+int baseColor2[3];
+short gradient1=0;
+short gradient2=0;
+
 static char *custom = NULL;
 static char *custom2 = NULL;
 static short color = TB_WHITE;
@@ -26,7 +35,7 @@ static int nballs = 10;
 static short speedMult = 5;
 static short rim = 1;
 static short contained = 0;
-static float radiusIn = 100;
+static float radiusIn = 110;
 static float radius;
 static int margin;
 static float sumConst;
@@ -45,6 +54,45 @@ short next_color(short current);
 void fix_rim_color();
 void set_random_colors(short level);
 
+void set_pallete();
+uintattr_t get_color(float val);
+void set_pallete2();
+
+int set_color(short *var, int *baseColor, char *optarg, short useGradient) {
+  if (useGradient) {
+    // Parse hex color
+    if (sscanf(optarg, "%02x%02x%02x", &baseColor[0], &baseColor[1], &baseColor[2]) == 3) {
+      return 1;
+    } else {
+      printf("Invalid hex color format. Use format: RRGGBB\n");
+      return 0;
+    }
+  } else {
+    // Parse named color
+    if (strcmp(optarg, "red") == 0) {
+      *var = TB_RED;
+    } else if (strcmp(optarg, "yellow") == 0) {
+      *var = TB_YELLOW;
+    } else if (strcmp(optarg, "blue") == 0) {
+      *var = TB_BLUE;
+    } else if (strcmp(optarg, "green") == 0) {
+      *var = TB_GREEN;
+    } else if (strcmp(optarg, "magenta") == 0) {
+      *var = TB_MAGENTA;
+    } else if (strcmp(optarg, "cyan") == 0) {
+      *var = TB_CYAN;
+    } else if (strcmp(optarg, "black") == 0) {
+      *var = TB_BLACK;
+    } else if (strcmp(optarg, "white") == 0) {
+      *var = TB_WHITE;
+    } else {
+      printf("Unknown color: %s\n", optarg);
+      return 0;
+    }
+    return 1;
+  }
+}
+
 int main(int argc, char *argv[]) {
 
   if (!parse_options(argc, argv))
@@ -61,6 +109,7 @@ int main(int argc, char *argv[]) {
 
   init_params();
 
+
   while (1) {
 
     // move balls
@@ -88,32 +137,48 @@ int main(int argc, char *argv[]) {
 
           for (int k = 0; k < nballs; k++) {
             int y = j * 2 + j2;
-            sum[j2] += (radius * radius) /
-                       ((float)((i - balls[k].x) * (i - balls[k].x) +
-                                (y - balls[k].y) * (y - balls[k].y)));
+            float dist_squared = (i - balls[k].x) * (i - balls[k].x) + (y - balls[k].y) * (y - balls[k].y);
+            if (dist_squared == 0) {
+              sum[j2] += FLT_MAX; 
+            } else {
+              sum[j2] += (radius * radius) / dist_squared;
+            }
           }
         }
 
         if (!custom) {
-          if (sum[0] > sumConst) {
-            if (sum[1] > sumConst) {
-              tb_printf(i, j, color2, 0, "█");
-            } else {
-              tb_printf(i, j, color2, 0, "▀");
-            }
-          } else if (sum[1] > sumConst) {
-            tb_printf(i, j, color2, 0, "▄");
-          }
-
-          if (rim) {
-            if (sum[0] > sumConst2) {
-              if (sum[1] > sumConst2) {
-                tb_printf(i, j, color, 0, "█");
+          if(gradient1){
+            if (sum[0] > sumConst) {
+              if (sum[1] > sumConst) {
+                tb_printf(i, j, get_color( sum[0]), get_color(sum[1]), "▀");
               } else {
-                tb_printf(i, j, color2, color, "▄");
+                tb_printf(i, j, get_color( sum[0]), TB_TRUECOLOR_DEFAULT, "▀");
+              }
+            } else if (sum[1] > sumConst) {
+              tb_printf(i, j,get_color( sum[1]),TB_TRUECOLOR_DEFAULT, "▄");
+            }
+
+          }else{
+            if (sum[0] > sumConst) {
+              if (sum[1] > sumConst) {
+                tb_printf(i, j, color2, 0, "█");
+              } else {
+                tb_printf(i, j, color2, 0, "▀");
+              }
+            } else if (sum[1] > sumConst) {
+              tb_printf(i, j, color2, 0, "▄");
+            }
+
+            if (rim) {
+              if (sum[0] > sumConst2) {
+                if (sum[1] > sumConst2) {
+                  tb_printf(i, j, color, 0, "█");
+                } else {
+                  tb_printf(i, j, color2, color, "▄");
+                }
+              } else if (sum[1] > sumConst2) {
+                tb_printf(i, j, color2, color, "▀");
               }
-            } else if (sum[1] > sumConst2) {
-              tb_printf(i, j, color2, color, "▀");
             }
           }
         } else {
@@ -188,22 +253,22 @@ void event_handler() {
       }
       break;
     case 'i':
-      if (radiusIn + 10 <= 150) {
-        radiusIn += 10;
+      if (radiusIn + 5 <= 150) {
+        radiusIn += 5;
         radius = (radiusIn * radiusIn + (float)(maxX * maxY)) / 15000;
         margin = contained ? radius * 10 : 0;
       }
       break;
     case 'd':
-      if (radiusIn - 10 >= 50) {
-        radiusIn -= 10;
+      if (radiusIn - 5 >= 100) {
+        radiusIn -= 5;
         radius = (radiusIn * radiusIn + (float)(maxX * maxY)) / 15000;
         margin = contained ? radius * 10 : 0;
       }
       break;
     case 'I':
 
-      if (color != TB_WHITE || custom)
+      if (color != TB_WHITE || custom || gradient1 )
         if (rim + 1 <= 5) {
           rim++;
           sumConst2 = sumConst * (1 + (float)(0.25 * rim));
@@ -211,7 +276,7 @@ void event_handler() {
       break;
     case 'D':
 
-      if (color != TB_WHITE || custom)
+      if (color != TB_WHITE || custom || gradient1)
         if (rim - 1 >= 0) {
           rim--;
           sumConst2 = sumConst * (1 + (float)(0.25 * rim));
@@ -265,6 +330,12 @@ void init_params() {
     balls[i].dx = (rand() % 2 == 0) ? -1 : 1;
     balls[i].dy = (rand() % 2 == 0) ? -1 : 1;
   }
+  if(gradient1){
+    tb_set_output_mode(TB_OUTPUT_TRUECOLOR);
+    tb_set_clear_attrs(TB_TRUECOLOR_DEFAULT, TB_TRUECOLOR_DEFAULT);
+    if(gradient2) set_pallete2();
+    else set_pallete();
+  }
 }
 
 short next_color(short current){
@@ -273,6 +344,7 @@ short next_color(short current){
       return colors[(i+1)%8];
     }
   }
+  return colors[0];
 }
 
 void fix_rim_color(){
@@ -287,44 +359,36 @@ void set_random_colors( short level){
   fix_rim_color();
 }
 
-int set_color(short *var, char *optarg) {
-
-  if (strcmp(optarg, "red") == 0) {
-    *var = TB_RED;
-  } else if (strcmp(optarg, "yellow") == 0) {
-    *var = TB_YELLOW;
-  } else if (strcmp(optarg, "blue") == 0) {
-    *var = TB_BLUE;
-  } else if (strcmp(optarg, "green") == 0) {
-    *var = TB_GREEN;
-  } else if (strcmp(optarg, "magenta") == 0) {
-    *var = TB_MAGENTA;
-  } else if (strcmp(optarg, "cyan") == 0) {
-    *var = TB_CYAN;
-  } else if (strcmp(optarg, "black") == 0) {
-    *var = TB_BLACK;
-  } else if (strcmp(optarg, "white") == 0) {
-    *var = TB_WHITE;
-  } else {
-    printf("Unknown color: %s\n", optarg);
-    return 0;
-  }
-  return 1;
-}
-
 int parse_options(int argc, char *argv[]) {
   if (argc == 1)
     return 1;
+  
   int c;
-  while ((c = getopt(argc, argv, ":c:k:s:r:R:b:F:Cp:h")) != -1) {
+  // First pass to check for gradient mode
+  optind = 1;  // Reset getopt
+  while ((c = getopt(argc, argv, ":c:k:s:r:R:b:F:Cp:hg")) != -1) {
+    if (c == 'g') {
+      gradient1 = 1;
+      if (!tb_has_truecolor()) {
+        fprintf(stderr, "The terminal does not support truecolor\n");
+        return 0;
+      }
+      break;
+    }
+  }
+
+  // Reset getopt for second pass
+  optind = 1;
+  while ((c = getopt(argc, argv, ":c:k:s:r:R:b:F:Cp:hg")) != -1) {
     switch (c) {
     case 'c':
-      if (!set_color(&color, optarg))
+      if (!set_color(&color, baseColor, optarg, gradient1))
         return 0;
       break;
     case 'k':
-      if (!set_color(&color2, optarg))
+      if (!set_color(&color2, baseColor2, optarg, gradient1))
         return 0;
+      gradient2 = gradient1;  // If we're using gradient, enable the second gradient too
       break;
     case 's':
       speedMult = atoi(optarg);
@@ -341,18 +405,16 @@ int parse_options(int argc, char *argv[]) {
       }
       break;
     case 'r':
-      radiusIn = 50 + atoi(optarg) * 10;
-      if (radiusIn > 150 || radiusIn < 50) {
+      radiusIn = 100 + atoi(optarg) * 5;
+      if (radiusIn > 150 || radiusIn < 100) {
         printf("Invalid radius, only values between 1 and 10 are allowed\n");
         return 0;
       }
       break;
-
     case 'b':
       nballs = atoi(optarg);
       if (nballs > MAX_NBALLS || nballs < MIN_NBALLS) {
-
-        printf("Invalid number of metaballs, only values between %i and %i are"
+        printf("Invalid number of metaballs, only values between %i and %i are "
                "allowed\n",
                MIN_NBALLS, MAX_NBALLS);
         return 0;
@@ -366,7 +428,7 @@ int parse_options(int argc, char *argv[]) {
       break;
     case 'p':
       party = atoi(optarg);
-      if (party < 0 || party > 3 ) {
+      if (party < 0 || party > 3) {
         printf("Invalid party mode, only values between 1 and 3 are allowed\n");
         return 0;
       }
@@ -375,6 +437,9 @@ int parse_options(int argc, char *argv[]) {
       print_help();
       return 0;
       break;
+    case 'g':
+      // Already handled in first pass
+      break;
     case ':':
       fprintf(stderr, "Option -%c requires an operand\n", optopt);
       return 0;
@@ -391,8 +456,13 @@ void print_help() {
   printf(
       "Usage: lavat [OPTIONS]\n"
       "OPTIONS:\n"
-      "  -c <COLOR>          Set color. Available colours: red, blue, yellow, "
-      "green, cyan, magenta, white and black. \n"
+      "  -g                  Enable gradient mode with truecolor support.\n"
+      "                      Changes how -c and -k options work.\n"
+      "  -c <COLOR>          Set color. In normal mode, available colors are: red, blue, yellow, "
+      "green, cyan, magenta, white, and black.\n"
+      "                      In gradient mode (-g), use hex format: RRGGBB (e.g., FF0000 for red).\n"
+      "  -k <COLOR>          Set the rim color. Same format options as -c.\n"
+      "                      In gradient mode, this sets the second color for the gradient.\n"
       "  -s <SPEED>          Set the speed, from 1 to 10. (default 5)\n"
       "  -r <RADIUS>         Set the radius of the metaballs, from 1 to 10. "
       "(default: 5)\n"
@@ -402,8 +472,6 @@ void print_help() {
       "color\n"
       "                      If you use Kitty or Alacritty you must use it "
       "with the -k option to see the rim.\n"
-      "  -k <COLOR>          Set the color of the rim if there is one."
-      " Available colours: red, blue, yellow, green, cyan, magenta, white and black. \n"
       "  -b <NBALLS>         Set the number of metaballs in the simulation, "
       "from %i to %i. (default: 10)\n"
       "  -F <CHARS>          Allows for a custom set of chars to be used\n"
@@ -428,6 +496,58 @@ void print_help() {
       "  p                   TURN ON THE PARTY AND CYCLE THROUGH THE PARTY MODES "
       "(it can also turns off the party).\n"
       "(Tip: Zoom out in your terminal before running the program to get a "
-      "better resolution of the lava).\n",
+      "better resolution of the lava).\n"
+      "EXAMPLES:\n"
+      "  lavat -c green -k red        Use named colors in normal mode\n"
+      "  lavat -g -c 00FF00 -k FF0000 Use hex colors in gradient mode\n",
       MIN_NBALLS, MAX_NBALLS);
 }
+
+void set_pallete(){
+  int avgColor= (baseColor[0] + baseColor[1] + baseColor[2])/3;
+  int blackfactor[5]; 
+  int whitefactor[5]; 
+  for(int i=1 ;i<6;i++){
+    blackfactor[i-1]=(6-i)*avgColor/5;
+    whitefactor[i-1]=i*(255-avgColor)/5;
+  }
+
+  for(int i=0 ;i<5;i++){
+    int r, g, b;
+    float factor = (1 - ((float)blackfactor[i]/(avgColor)));
+    r = baseColor[0]*factor;
+    g = baseColor[1]*factor;
+    b = baseColor[2]*factor;
+    pallete[i]= (r << 16) | (g << 8) | b;
+    r = baseColor[0] + (255-baseColor[0])*whitefactor[i]/(255-avgColor);
+    g = baseColor[1] + (255-baseColor[1])*whitefactor[i]/(255-avgColor);
+    b = baseColor[2] + (255-baseColor[2])*whitefactor[i]/(255-avgColor);
+    pallete[i+6] = (r << 16) | (g << 8) | b;
+
+  }
+  pallete[5]= (baseColor[0] << 16) | (baseColor[1] << 8) | baseColor[2];
+}
+
+void set_pallete2() {
+  for (int i = 0; i < 11; i++) {
+    float t = (float)i / (11 - 1); 
+    
+    int r = (1 - t) * baseColor[0] + t * baseColor2[0];
+    int g = (1 - t) * baseColor[1] + t * baseColor2[1];
+    int b = (1 - t) * baseColor[2] + t * baseColor2[2];
+
+    pallete[i] = (r << 16) | (g << 8) | b;
+  }
+}
+
+uintattr_t get_color(float val) {
+    val = (val - sumConst)/(0.001*(rim+1)); 
+    
+    if (val > 10) {
+        return pallete[10];       
+    } else if (val < 0) {
+        return pallete[0];        
+    }
+
+    return pallete[(int)val];     
+}

makefile

@@ -9,8 +9,10 @@ clean:
 
 .PHONY: install
 install: lavat
-	install 				-D lavat 		$(DESTDIR)$(PREFIX)/bin/lavat
+	mkdir -p $(PREFIX)/bin
+	install lavat $(PREFIX)/bin/lavat
+
+.PHONY: uninstall
+uninstall:
+	$(RM) $(PREFIX)/bin/lavat
 
-.PHONY: unistall
-unistall:
-	$(RM) $(DESTDIR)$(PREFIX)/bin/lavat