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Add a density parameter to GenImageRadialGradient

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This commit is contained in:
Wilhem Barbier 2017-06-28 17:27:47 +02:00
parent c3049a9b06
commit 786cd63057
3 changed files with 5 additions and 4 deletions
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2
examples/textures/textures_image_generation.c
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@ -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);

2
src/raylib.h
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@ -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

5
src/textures.c
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@ -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));