1 files changed, 68 insertions, 0 deletions
diff --git a/include/smprogresser.hpp b/include/smprogresser.hpp
new file mode 100644
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--- /dev/null
+++ b/include/smprogresser.hpp
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+// -*- C++ -*-
+/*
+ * Simple MultimEdia LiTerator(SMELT)
+ * by Chris Xiong 2015
+ * Progresser header & implementation
+ *
+ * WARNING: This library is in development and interfaces would be very
+ * unstable.
+ *
+ */
+#include "smmath.hpp"
+class smProgresserLinear
+{
+private:
+	double a,b,val;
+	double elapsed,lim;
+	bool done;
+public:
+	void init(double _a,double _b,double _lim){a=_a;b=_b;lim=_lim;}
+	void launch(){elapsed=.0;val=a;done=false;}
+	void update(double delta)
+	{
+		if(elapsed+delta>=lim)return(void)(val=b,elapsed=lim,done=true);
+		elapsed+=delta;val=(b-a)*(elapsed/lim)+a;
+	}
+	bool isDone(){return done;}
+	double getValue(){return val;}
+	double getPercentage(){return elapsed/lim;}
+	double getDelta(){return val-a;}
+	double getElapsed(){return elapsed;}
+};
+class smProgresserCurve
+{
+private:
+	double a,b,val;int cpara;
+	double elapsed,lim;
+	bool done;
+	double transformFunc(double x)
+	{
+		if(cpara>=64)return sqrt(1-sqr(x-1));
+		if(cpara>0)
+		{
+			double ctrx=(1+sqrt(2*sqr(64-cpara)-1))/2;double ctry=1-ctrx;
+			return sqrt(sqr(64-cpara)-sqr(x-ctrx))+ctry;
+		}
+		if(cpara==0)return x;
+		if(cpara<=-64)return -sqrt(1-sqr(x))+1;
+		if(cpara<0)
+		{
+			double ctrx=(1-sqrt(2*sqr(64+cpara)-1))/2;double ctry=1-ctrx;
+			return -sqrt(sqr(64+cpara)-sqr(x-ctrx))+ctry;
+		}
+		return NAN;
+	}
+public:
+	void init(double _a,double _b,double _lim,int _cp){a=_a;b=_b;lim=_lim;cpara=_cp;}
+	void launch(){elapsed=.0;val=a;done=false;}
+	void update(double delta)
+	{
+		if(elapsed+delta>=lim)return(void)(val=b,elapsed=lim,done=true);
+		elapsed+=delta;val=(b-a)*transformFunc(elapsed/lim)+a;
+	}
+	bool isDone(){return done;}
+	double getValue(){return val;}
+	double getPercentage(){return elapsed/lim;}
+	double getDelta(){return val-a;}
+	double getElapsed(){return elapsed;}
+};