Added some handy methods.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30647 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debuganalyzer/gui/chart/ChartDataRange.h

@@ -34,6 +34,17 @@ public:
 	{
 	}
 
+	bool IsValid() const
+	{
+		
+		return min < max;
+	}
+
+	double Size() const
+	{
+		return max - min;
+	}
+
 	ChartDataRange& Extend(const ChartDataRange& other)
 	{
 		min = std::min(min, other.min);
@@ -41,6 +52,20 @@ public:
 		return *this;
 	}
 
+	ChartDataRange& OffsetBy(double offset)
+	{
+		min += offset;
+		max += offset;
+		return *this;
+	}
+
+	ChartDataRange& OffsetTo(double newMin)
+	{
+		max += newMin - min;
+		min = newMin;
+		return *this;
+	}
+
 	ChartDataRange& operator=(const ChartDataRange& other)
 	{
 		min = other.min;