Add a density parameter to GenImageRadialGradient

examples/textures/textures_image_generation.c

@@ -22,7 +22,7 @@ int main()
 
     Image verticalGradient = GenImageGradientV(screenWidth, screenHeight, RED, BLUE);
     Image horizontalGradient = GenImageGradientH(screenWidth, screenHeight, RED, BLUE);
-    Image radialGradient = GenImageRadialGradient(screenWidth, screenHeight, WHITE, BLACK);
+    Image radialGradient = GenImageRadialGradient(screenWidth, screenHeight, 0.f, WHITE, BLACK);
     Image checked = GenImageChecked(screenWidth, screenHeight, 32, 32, RED, BLUE);
     Image whiteNoise = GenImageWhiteNoise(screenWidth, screenHeight, 0.5f);
     Image perlinNoise = GenImagePerlinNoise(screenWidth, screenHeight, 8.f);

src/raylib.h

@@ -877,7 +877,7 @@ RLAPI void ImageColorBrightness(Image *image, int brightness);
 // Image generation functions
 RLAPI Image GenImageGradientV(int width, int height, Color top, Color bottom);                           // Generate image: vertical gradient
 RLAPI Image GenImageGradientH(int width, int height, Color left, Color right);                           // Generate image: horizontal gradient
-RLAPI Image GenImageRadialGradient(int width, int height, Color inner, Color outer);                     // Generate image: radial gradient
+RLAPI Image GenImageRadialGradient(int width, int height, float density, Color inner, Color outer);      // Generate image: radial gradient
 RLAPI Image GenImageChecked(int width, int height, int checksX, int checksY, Color col1, Color col2);    // Generate image: checked
 RLAPI Image GenImageWhiteNoise(int width, int height, float factor);                                     // Generate image: white noise
 RLAPI Image GenImagePerlinNoise(int width, int height, float scale);                                     // Generate image: perlin noise

src/textures.c

@@ -1493,7 +1493,7 @@ Image GenImageGradientH(int width, int height, Color left, Color right)
 }
 
 // Generate image: radial gradient
-Image GenImageRadialGradient(int width, int height, Color inner, Color outer)
+Image GenImageRadialGradient(int width, int height, float density, Color inner, Color outer)
 {
     Color *pixels = (Color*)malloc(width * height * sizeof(Color));
     float radius = (width < height) ? (float)width / 2.f : (float)height / 2.f;
@@ -1505,7 +1505,8 @@ Image GenImageRadialGradient(int width, int height, Color inner, Color outer)
         for (int x = 0; x < width; x++)
         {
             float dist = hypotf((float)x - center_x, (float)y - center_y);
-            float factor = dist / radius;
+            float factor = (dist - radius * density) / (radius * (1.f - density));
+            factor = fmax(factor, 0.f);
             factor = fmin(factor, 1.f); // dist can be bigger than radius so we have to check
             pixels[y*width + x].r = (int)((float)outer.r * factor + (float)inner.r * (1.f - factor));
             pixels[y*width + x].g = (int)((float)outer.g * factor + (float)inner.g * (1.f - factor));