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Add a few utils from Rumina

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Sebastian Krzyszkowiak 2018-03-20 21:38:50 +01:00
parent 8d0df727cb
commit e58fbdb560
2 changed files with 37 additions and 0 deletions
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30
src/utils.c
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@ -117,6 +117,36 @@ SYMBOL_EXPORT int DrawWrappedTextWithShadow(ALLEGRO_FONT* font, ALLEGRO_COLOR co
return DrawWrappedText(font, color, x, y, width, flags, text);
}
SYMBOL_EXPORT void DrawCentered(ALLEGRO_BITMAP* bitmap, int x, int y, int flags) {
al_draw_bitmap(bitmap, x - al_get_bitmap_width(bitmap) / 2.0, y - al_get_bitmap_height(bitmap) / 2.0, flags);
}
SYMBOL_EXPORT double DotProduct(const double v[], const double u[], int n) {
float result = 0.0;
for (int i = 0; i < n; i++) {
result += v[i] * u[i];
}
return result;
}
SYMBOL_EXPORT double VectorLength(double x, double y, double z) {
return sqrt(pow(x, 2) + pow(y, 2) + pow(z, 2));
}
SYMBOL_EXPORT double Clip(double left, double right, double val) {
if (val > right) {
return right;
}
if (val < left) {
return left;
}
return val;
}
SYMBOL_EXPORT double Lerp(double left, double right, double pos) {
return left + (right - left) * pos;
}
/* linear filtering code written by SiegeLord */
SYMBOL_EXPORT ALLEGRO_COLOR InterpolateColor(ALLEGRO_COLOR c1, ALLEGRO_COLOR c2, float frac) {
return al_map_rgba_f(c1.r + frac * (c2.r - c1.r),

7
src/utils.h
View file

@ -52,6 +52,13 @@ void DrawTextWithShadow(ALLEGRO_FONT* font, ALLEGRO_COLOR color, float x, float
int DrawWrappedText(ALLEGRO_FONT* font, ALLEGRO_COLOR color, float x, float y, int width, int flags, char const* text);
int DrawWrappedTextWithShadow(ALLEGRO_FONT* font, ALLEGRO_COLOR color, float x, float y, int width, int flags, char const* text);
void DrawCentered(ALLEGRO_BITMAP* bitmap, int x, int y, int flags);
double DotProduct(const double v[], const double u[], int n);
double VectorLength(double x, double y, double z);
double Clip(double left, double right, double val);
double Lerp(double left, double right, double pos);
ALLEGRO_COLOR InterpolateColor(ALLEGRO_COLOR c1, ALLEGRO_COLOR c2, float frac);
void ScaleBitmap(ALLEGRO_BITMAP* source, int width, int height);