Add Num.mix()

2 files changed, 10 insertions, 0 deletions

diff --git a/builtins/nums.c b/builtins/nums.c
index 0ad2bdc2..286b8d1d 100644
--- a/builtins/nums.c
+++ b/builtins/nums.c
@@ -64,6 +64,10 @@ public double Num$random(void) {
     return drand48(); 
 }
 
+public double Num$mix(double amount, double x, double y) { 
+    return (1.0-amount)*x + amount*y;
+}
+
 public double Num$from_text(CORD text, CORD *the_rest) {
     const char *str = CORD_to_const_char_star(text);
     char *end = NULL;
@@ -142,6 +146,10 @@ public float Num32$random(void) {
     return (float)drand48(); 
 }
 
+public float Num32$mix(float amount, float x, float y) { 
+    return (1.0-amount)*x + amount*y;
+}
+
 public float Num32$from_text(CORD text, CORD *the_rest) {
     const char *str = CORD_to_const_char_star(text);
     char *end = NULL;
diff --git a/builtins/nums.h b/builtins/nums.h
index 3b4386e0..ec1663a2 100644
--- a/builtins/nums.h
+++ b/builtins/nums.h
@@ -24,6 +24,7 @@ bool Num$finite(double n);
 bool Num$isnan(double n);
 double Num$nan(CORD tag);
 double Num$random(void);
+double Num$mix(double amount, double x, double y);
 double Num$from_text(CORD text, CORD *the_rest);
 extern const TypeInfo $Num;
 
@@ -38,6 +39,7 @@ bool Num32$isinf(float n);
 bool Num32$finite(float n);
 bool Num32$isnan(float n);
 float Num32$random(void);
+float Num32$mix(float amount, float x, float y);
 float Num32$from_text(CORD text, CORD *the_rest);
 float Num32$nan(CORD tag);
 extern const TypeInfo $Num32;