Heatmap: Color undersaturated values relative to inert gas pressure

Color "undersaturated" values relative to inert gas pressure of gas being
breathed, rather than relative to inert gas pressure of air.
Also change slightly the point at which bright green (hue = 120 deg) from 10%
of M value to 0% of M value (=ambient pressure).
Other than the slight shift in lower bound of the green-red scale, this does
not affect the colors of the tissues with inert gas pressure greater than
ambient pressure, which are relative to the Buhlmann M value.

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/profile-widget/diveprofileitem.cpp b/profile-widget/diveprofileitem.cpp
index 896174185..2b7e4e396 100644
--- a/profile-widget/diveprofileitem.cpp
+++ b/profile-widget/diveprofileitem.cpp
@@ -385,19 +385,18 @@ void DivePercentageItem::modelDataChanged(const QModelIndex &topLeft, const QMod
 		texts.last()->setAlignment(Qt::AlignLeft | Qt::AlignBottom);
 }
 
-QColor DivePercentageItem::ColorScale(double value)
+QColor DivePercentageItem::ColorScale(double value, int inert)
 {
 	QColor color;
-	double scaledValue = value / (AMB_PERCENTAGE * N2_IN_AIR) * 1000.0;
-
+	double scaledValue = value / (AMB_PERCENTAGE * inert) * 1000.0;
 	if (scaledValue < 0.8)	// grade from cyan to blue to purple
 		color.setHsvF(0.5 + 0.25 * scaledValue / 0.8, 1.0, 1.0);
 	else if (scaledValue < 1.0)	// grade from magenta to black
 		color.setHsvF(0.75, 1.0, (1.0 - scaledValue) / 0.2);
-	else if (value < 55)	// grade from black to green
-		color.setHsvF(0.333, 1.0, (value - AMB_PERCENTAGE * N2_IN_AIR / 1000.0) / (55.0 - AMB_PERCENTAGE * N2_IN_AIR / 1000.0));
+	else if (value < AMB_PERCENTAGE)	// grade from black to green
+		color.setHsvF(0.333, 1.0, (value - AMB_PERCENTAGE * inert / 1000.0) / (AMB_PERCENTAGE - AMB_PERCENTAGE * inert / 1000.0));
 	else if (value < 100)		// grade from green to yellow to red
-		color.setHsvF(0.333 * (100.0 - value) / 45.0, 1.0, 1.0);
+		color.setHsvF(0.333 * (100.0 - value) / (100.0 - AMB_PERCENTAGE), 1.0, 1.0);
 	else if (value < 120)		// M value exceeded - grade from red to white
 		color.setHsvF(0.0, 1 - (value - 100.0) / 20.0, 1.0);
 	else	// white
@@ -421,7 +420,9 @@ void DivePercentageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem
 	for (int i = 1, modelDataCount = dataModel->rowCount(); i < modelDataCount; i++) {
 		if (i < poly.count()) {
 			double value = dataModel->index(i, vDataColumn).data().toDouble();
-			mypen.setBrush(QBrush(ColorScale(value)));
+			int cyl = dataModel->index(i, DivePlotDataModel::CYLINDERINDEX).data().toInt();
+			int inert = 1000 - get_o2(&displayed_dive.cylinder[cyl].gasmix);
+			mypen.setBrush(QBrush(ColorScale(value, inert)));
 			painter->setPen(mypen);
 			painter->drawLine(poly[i - 1], poly[i]);
 		}