Am 09.11.2014 um 20:52 schrieb Kay F. Jahnke:
The documentation shows me that QImage supports alpha channels. So the
way to go would be to have the map all black and assign the calculated
hillshade to the alpha channel instead of the pixel's grey value. If I
understand the docu right, you can continue using the same QImage you
make, and could use a coulour table. The coulour table's entries can be
ARGB values, so you can let the transparency correspond with the value
in the QImage by assigning
0 -> 0, 0, 0, 0
1 -> 1, 0, 0, 0
...
255 -> 255, 0, 0.
I tried a quick hack, but failed
okay, here you go, quick hack, couldn't figure out how to initialize
only once, sure you can do better:
static QVector<QRgb> colourmap ( 256 ) ;
void IDem::hillshading(QVector<qint16>& data, qreal w, qreal h, QImage& img)
{
int wp2 = w + 2;
qint16 win[9];
qreal dx, dy, aspect, xx_plus_yy, cang;
for ( int i = 0 ; i < 256 ; i++ )
colourmap[i] = qRgba(0, 0, 0, 255 - i) ;
...
img.setColorTable ( colourmap );
}
find patch attached
Kay
diff -r 8c504fe90558 CMakeLists.txt
--- a/CMakeLists.txt Tue Nov 04 21:49:51 2014 +0100
+++ b/CMakeLists.txt Sun Nov 09 21:12:27 2014 +0100
@@ -4,9 +4,15 @@
# has to be removed later on
+# <<<<<<< local
+# if(UNIX)
+# set(CMAKE_PREFIX_PATH /opt/Qt/5.3/gcc_64)
+# endif(UNIX)
+# =======
if(UNIX)
-set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} /opt/Qt/5.3/gcc_64)
+set(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} /home/kfj/Qt/5.3/gcc_64) # /opt/Qt/5.3/gcc_64)
endif(UNIX)
+# >>>>>>> other
if(WIN32)
diff -r 8c504fe90558 qmapshack.desktop
--- a/qmapshack.desktop Tue Nov 04 21:49:51 2014 +0100
+++ b/qmapshack.desktop Sun Nov 09 21:12:27 2014 +0100
@@ -1,3 +1,4 @@
+#!/usr/bin/env xdg-open
[Desktop Entry]
Version=1.0
Name=QMapShack
diff -r 8c504fe90558 src/dem/IDem.cpp
--- a/src/dem/IDem.cpp Tue Nov 04 21:49:51 2014 +0100
+++ b/src/dem/IDem.cpp Sun Nov 09 21:12:27 2014 +0100
@@ -124,12 +124,16 @@
return factorHillshading;
}
}
+ ;
+static QVector<QRgb> colourmap ( 256 ) ;
void IDem::hillshading(QVector<qint16>& data, qreal w, qreal h, QImage& img)
{
int wp2 = w + 2;
qint16 win[9];
qreal dx, dy, aspect, xx_plus_yy, cang;
+ for ( int i = 0 ; i < 256 ; i++ )
+ colourmap[i] = qRgba(0, 0, 0, 255 - i) ;
#define ZFACT 0.125
#define ZFACT_BY_ZFACT (ZFACT*ZFACT)
@@ -159,6 +163,7 @@
img.setPixel(n - 1, m - 1, cang);
}
}
+ img.setColorTable ( colourmap );
}
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