cocos2d iphone functions for vectors
Language: Objective-C
#define PI 3.14159265358979
static inline CGPoint flipY(const CGPoint v) {
return ccp(v.x, v.y * -1);
}
static inline CGPoint flipX(const CGPoint v) {
return ccp(v.x * -1, v.y);
}
static inline float decByFactor(const float value, const float limit, const float factor) {
if (factor > 0) {
return value;
} else {
float rv = value * factor;
if (rv < limit)
rv = limit;
return rv;
}
}
static inline float incByFactor(const float value, const float limit, const float factor) {
if (factor < 0) {
return value;
} else {
float rv = value * factor;
if (rv < limit)
rv = limit;
return rv;
}
}
static inline float plotSine(const float degrees, const float min, const float max) {
float radians = degrees * PI / 180;
float offset = (max - min) / 2;
return sin(radians) * offset + (min + offset);
}
static inline CGPoint plotCircle(const float degrees, const float radius) {
float radians = degrees * PI / 180;
return CGPointMake(sin(radians) * radius, cos(radians) * radius);
}
Reveal More
Added almost 2 years ago by 
arsydotorg
arsydotorg