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[apps/graph/values] Change interval model

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Change-Id: Iae085abd6bc975559b3204ef19bc25fe4eb4aba0
This commit is contained in:
Émilie Feral
2016-10-17 15:59:54 +02:00
parent a643969ee5
commit 44aab67007
4 changed files with 48 additions and 15 deletions
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44
apps/graph/values/interval.cpp
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@@ -3,24 +3,23 @@
namespace Graph {
Interval::Interval(float start, float end, float step) :
m_start(start),
m_end(end),
m_step(step)
Interval::Interval() :
m_start(0),
m_end(0),
m_step(0),
m_needCompute(false)
{
}
int Interval::numberOfElements() {
if (m_start > m_end) {
return 0;
} else {
return 1 + (m_end - m_start)/m_step;
}
computeElements();
return m_numberOfElements;
}
float Interval::element(int i) {
assert(i >= 0 && i < numberOfElements());
return m_start + i*m_step;
computeElements();
return m_intervalBuffer[i];
}
float Interval::start() {
@@ -37,14 +36,39 @@ float Interval::step() {
void Interval::setStart(float f) {
m_start = f;
m_needCompute = true;
}
void Interval::setEnd(float f) {
m_end = f;
m_needCompute = true;
}
void Interval::setStep(float f) {
m_step = f;
m_needCompute = true;
}
void Interval::setElement(int i, float f) {
assert(i < numberOfElements());
computeElements();
m_intervalBuffer[i] = f;
}
void Interval::computeElements() {
if (!m_needCompute) {
return;
}
if ( m_start > m_end) {
m_numberOfElements = 0;
} else {
m_numberOfElements = m_step > 0 ? 1 + (m_end - m_start)/m_step : k_maxNumberOfElements;
m_numberOfElements = m_numberOfElements > k_maxNumberOfElements ? k_maxNumberOfElements : m_numberOfElements;
}
for (int i = 0; i < m_numberOfElements; i += 1) {
m_intervalBuffer[i] = m_start + i * m_step;
}
m_needCompute = false;
}
}