1 files changed, 36 insertions, 0 deletions
diff --git a/samples/OpenGL/qt_terr/terrain.cpp b/samples/OpenGL/qt_terr/terrain.cpp
new file mode 100644
index 0000000..e18efe4
--- /dev/null
+++ b/samples/OpenGL/qt_terr/terrain.cpp
@@ -0,0 +1,36 @@
+#include "terrain.h"
+
+void Terrain::split()
+{
+	if(is_split())
+		return;
+
+	quads[0][0] = new Terrain(V);
+	quads[0][1] = new Terrain(V);
+	quads[1][0] = new Terrain(V);
+	quads[1][1] = new Terrain(V);
+
+	quads[0][0]->set_range(*x1(), *x_mid(), *y1(), *y_mid());
+	quads[0][1]->set_range(*x_mid(), *x2(), *y1(), *y_mid());
+	quads[1][0]->set_range(*x1(), *x_mid(), *y_mid(), *y2());
+	quads[1][1]->set_range(*x_mid(), *x2(), *y_mid(), *y2());
+}
+
+void Terrain::track_down(double x, double y, double nz, int levels)
+{
+	if( levels > 0 ) {
+		int a = ( x < *x_mid() ) ? 0 : 1;
+		int b = ( y < *y_mid() ) ? 0 : 1;
+
+		if( !is_split() )
+			split();
+
+		dynamic_cast<Terrain*>(quads[b][a])->track_down(x, y, nz, levels-1);
+	}
+	else {
+		z[0][0]=
+		z[0][1]=
+		z[1][1]=
+		z[1][0] = z_mean_ = nz;
+	}
+}