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Playing around with Time at Pressure chart using splines

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This commit is contained in:
Mark Watkins 2016-03-06 18:38:12 +10:00
parent 6a9afa4723
commit fb26e083cb
1 changed files with 66 additions and 5 deletions
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71
sleepyhead/Graphs/MinutesAtPressure.cpp
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@ -119,6 +119,17 @@ bool MinutesAtPressure::isEmpty()
return m_empty;
}
// Calculate Catmull-Rom Spline of given 4 samples, with t between 0-1;
float CatmullRomSpline(float p0, float p1, float p2, float p3, float t = 0.5)
{
float t2 = t*t;
float t3 = t2 * t;
return (float)0.5 * ((2 * p1) +
(-p0 + p2) * t +
(2*p0 - 5*p1 + 4*p2 - p3) * t2 +
(-p0 + 3*p1- 3*p2 + p3) * t3);
}
void MinutesAtPressure::paint(QPainter &painter, gGraph &graph, const QRegion &region)
{
@ -297,20 +308,70 @@ void MinutesAtPressure::paint(QPainter &painter, gGraph &graph, const QRegion &r
float y1, y2;
it = times.begin();
float bottom = top+height;
if (it != times_end) {
float minutes = float(it.value()) / 60.0;
y1 = minutes * ymult;
QVector<float> P;
QVector<float> tap;
P.resize(26);
tap.reserve(260);
for (; it != times_end; ++it) {
int p = it.key();
Q_ASSERT(p < 255);
float v = float(it.value()) / 60.0;
P[p] = v;
}
tap.append(P[0]);
for (int i=1; i<24; ++i) {
float p0 = P[i-1];
float p1 = P[i];
float p2 = P[i+1];
float p3 = P[i+2];
// Calculate Catmull-Rom Splines in between samples
tap.append(P[i]);
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.1)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.2)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.3)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.4)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.5)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.6)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.7)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.8)));
tap.append(qMax(0.0f,CatmullRomSpline(p0,p1,p2,p3,0.9)));
}
tap.append(P[24]);
tap.append(P[25]);
painter.setPen(QPen(QColor(Qt::gray), 2));
float minutes = tap[0];
y1 = minutes * ymult;
int tapsize = tap.size();
for (int i=0; i<tapsize; ++i) {
minutes = tap[i];
y2 = minutes * ymult;
painter.drawLine(xpos, bottom-y1, xpos+pix/10.0, bottom-y2);
y1 = y2;
xpos += pix / 10.0;
}
/* float minutes = float(it.value()) / 60.0;
y1 = minutes * ymult;
it=times.begin();
it++;
for (; it != times_end; ++it) {
float minutes = float(it.value()) / 60.0;
y2 = minutes * ymult;
// painter.drawLine(xpos, bottom-y1, xpos+pix, bottom-y2);
painter.drawLine(xpos, bottom-y1, xpos+pix, bottom-y2);
y1 = y2;
xpos += pix;
}
}*/
float maxev = 0;
@ -348,7 +409,7 @@ void MinutesAtPressure::paint(QPainter &painter, gGraph &graph, const QRegion &r
schema::ChanType type = chan.type();
if (type == schema::SPAN)
continue;
//painter.setPen(QPen(QColor(chan.defaultColor()), 2));
painter.setPen(QPen(QColor(chan.defaultColor()), 2));
eit = events.find(code);
xpos = left;//+pix/2;