Changeset 913 for cpp

Timestamp:

04/20/20 23:27:35 (5 years ago)

Author:

Maciej Komosinski

Message:

Added a few utility/helper functions

Location:

cpp/common

Files:

• Convert.h (modified) (2 diffs)
• nonstd_math.h (modified) (2 diffs)
• util-string.cpp (modified) (1 diff)
• util-string.h (modified) (1 diff)

cpp/common/Convert.h

@@ -45 +45 @@
         static double odleglosc_sq(double x1, double y1, double x2, double y2) //odleglosc do kwadratu, wystarczy do porownywania
         {
-                double dx = x2 - x1, dy = y2 - y1; return dx*dx + dy*dy;
+                double dx = x2 - x1, dy = y2 - y1;
+                return dx*dx + dy*dy;
         }
         static double odleglosc_sq(const Pt2D& p1, const Pt2D& p2) //odleglosc do kwadratu
@@ -97 +98 @@
         Angle(Angle &kt) { set(kt.get()); }
         Angle(double dy, double dx) { set(dy, dx); }
+        Angle(const Pt2D& xy) { set(xy); }
         void set(double k) { k = fmod(k, M_PI * 2); if (k < 0) k += M_PI * 2; angle = k; sine = sin(k); cosine = cos(k); angle_deg = Convert::toDegrees(angle); angle_deg_int = roundToInt(angle_deg); angle_deg_int %= 360; }
         void set(double dy, double dx) { set(Convert::atan_2(dy, dx)); }
+        void set(const Pt2D& xy) { set(xy.y, xy.x); }
         void add(double dk) { set(angle + dk); }
         void add(Angle &kt) { set(angle + kt.get()); }

cpp/common/nonstd_math.h

@@ -58 +58 @@
 #endif
 
-
 //handling floating point exceptions
 void fpExceptInit(); //call once, before ...Enable/Disable
@@ -67 +66 @@
 template <typename Value, typename Linear> Value universal_lerp(Value a,Value b,Linear t) {return a*(1-t)+b*t;}
 
+template <typename T> T linearTransform(T value, T min_in, T max_in, T min_out, T max_out)
+{
+        return min_out + (value-min_in)*(max_out-min_out)/(max_in-min_in);
+}
+
 #endif

cpp/common/util-string.cpp

@@ -77 +77 @@
 }
 
+bool str_starts_with(const char *str, const char *prefix)
+{
+        return strncmp(str,prefix,strlen(prefix))==0;
+}
+
 char* strmove(char *a, char *b) //strcpy that works well for overlapping strings ("Source and destination overlap")
 {

cpp/common/util-string.h

@@ -10 +10 @@
 
 char* strmove(char *a, char *b); //strcpy that works well for overlapping strings ("Source and destination overlap")
+bool str_starts_with(const char *str, const char *prefix);
+inline bool starts_with(string& str, const char *prefix) { return str_starts_with(str.c_str(),prefix); } //std::string.starts_with(...) since c++20
 
 string ssprintf(const char* format, ...);