Index: trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 11703)
+++ trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 11704)
@@ -740,5 +740,5 @@
 
         // alpha value is based on zoom and line with combined with global layer alpha
-        float theLineAlpha = Math.min(Math.max((0.50f/(float) zoomScale)/(globalLineWidth + 1), 0.01f), 0.50f) * layerAlpha;
+        float theLineAlpha = (float) Utils.clamp((0.50 / zoomScale) / (globalLineWidth + 1), 0.01, 0.50) * layerAlpha;
         final int theLineWith = (int) (lineWidth / zoomScale) + 1;
 
@@ -1192,5 +1192,5 @@
 
         // global alpha adjustment
-        float lineAlpha = Math.min(Math.max((0.40f/(float) zoomScale)/(globalLineWidth+1), 0.01f), 0.40f);
+        float lineAlpha = (float) Utils.clamp((0.40 / zoomScale) / (globalLineWidth + 1), 0.01, 0.40);
 
         // adjust 0.15 .. 1.85
@@ -1198,7 +1198,7 @@
 
         // add to calculated values
-        float lineAlphaBPoint = Math.max(Math.min(((lineAlpha * 0.65f) * scaleAlpha), 0.90f), 0.001f);
-        float lineAlphaBLine = Math.max(Math.min(((lineAlpha * 1.00f) * scaleAlpha), 0.90f), 0.001f);
-        float lineAlphaFLine = Math.max(Math.min(((lineAlpha / 1.50f) * scaleAlpha), 0.90f), 0.001f);
+        float lineAlphaBPoint = (float) Utils.clamp((lineAlpha * 0.65) * scaleAlpha, 0.001, 0.90);
+        float lineAlphaBLine = (float) Utils.clamp((lineAlpha * 1.00) * scaleAlpha, 0.001, 0.90);
+        float lineAlphaFLine = (float) Utils.clamp((lineAlpha / 1.50) * scaleAlpha, 0.001, 0.90);
 
         // 3rd Calculate the heat map data by draw GPX traces with alpha value ----------