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Adjust heat map colour scale

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Make the heat map use a colour scale similar to that by Kevin Watt, as used in
Simon Mitchell's presentation, Decompression Controversies
https://www.youtube.com/watch?v=UY61E49lyos&t=2090&authuser=0

Undersaturated: cyan -> blue ->purple -> black
Supersaturated up to M value: black -> yellow -> red
Exceeding M value: red -> white

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Rick Walsh 2016-09-13 13:52:04 +10:00 • committed by Dirk Hohndel
parent cd99bbe727
commit ddc7f3dc98
1 changed files with 12 additions and 7 deletions
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19
profile-widget/diveprofileitem.cpp
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@ -400,13 +400,18 @@ void DivePercentageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem
for (int i = 0, modelDataCount = dataModel->rowCount(); i < modelDataCount; i++) {
if (i < poly.count()) {
double value = dataModel->index(i, vDataColumn).data().toDouble();
if (value < 50.0) {
value *= 255.0 / 50.0;
color.setRgb(rint(value), 255 - rint(value),0);
} else {
value = (value - 50.0) * 255.0 / 50.0;
color.setRgb(255 - rint(value), 0 , rint(value));
}
if (value < 0.8 * AMB_PERCENTAGE * N2_IN_AIR / 1000.0) // grade from cyan to blue to purple
color.setHsvF(0.5 + 0.25 * value / (0.8 * AMB_PERCENTAGE * N2_IN_AIR / 1000.0), 1.0, 1.0);
else if (value < AMB_PERCENTAGE * N2_IN_AIR / 1000.0) // grade from magenta to black
color.setHsvF(0.75, 1.0, (AMB_PERCENTAGE * N2_IN_AIR / 1000.0 - value) / (0.2 * AMB_PERCENTAGE * N2_IN_AIR / 1000.0));
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 < 100) // grade from green to yellow to red
color.setHsvF(0.333 * (100.0 - value) / 45.0, 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
color.setHsvF(0.0, 0.0, 1.0);
mypen.setBrush(QBrush(color));
painter->setPen(mypen);