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#include "ranged_value.h"
namespace JinEngine
{
namespace Math
{
RangedValue::RangedValue()
: mCount(0)
{
}
RangedValue::RangedValue(float* points, uint n)
: mCount(n)
{
for (uint i = 0; i < n; ++i)
{
float x = points[2*i];
float y = points[2*i + 1];
mXAxis.push_back(x);
mYAxis.push_back(y);
}
}
void RangedValue::addPoint(float x, float y)
{
mXAxis.push_back(x);
mYAxis.push_back(y);
++mCount;
}
void RangedValue::removePoint(uint i)
{
mXAxis.erase(mXAxis.begin() + i);
mYAxis.erase(mYAxis.begin() + i);
--mCount;
}
void RangedValue::insertPoint(uint i, float x, float y)
{
mXAxis.insert(mXAxis.begin() + i, x);
mYAxis.insert(mYAxis.begin() + i, y);
++mCount;
}
float RangedValue::getValue(float x)
{
int endIndex = -1;
int n = mCount;
for (int i = 1; i < n; i++) {
float t = mXAxis[i];
if (t > x) {
endIndex = i;
break;
}
}
if (endIndex == -1) return mYAxis[n - 1];
int startIndex = endIndex - 1;
float startValue = mYAxis[startIndex];
float startX = mXAxis[startIndex];
return startValue + (mYAxis[endIndex] - startValue) * ((x - startX) / (mXAxis[endIndex] - startX));
}
void RangedValue::clear()
{
mXAxis.clear();
mYAxis.clear();
}
}
}
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