SoftPrayog - Creating a graph with JRobin

Creating a graph with JRobin

Error:

Not able to save graph as a PNG file.
Compilation error: cannot find symbol
[javac] symbol : method saveAsPNG(java.lang.String,int,int)

Solution:

saveAsPNG does not seem to be there in JRobin anymore. Use the RrdGraph.render (java.awt.Graphics g) method. For example,

// Create a buffered image in which the graph would be drawn
BufferedImage bImage = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);

// Create a graphics context on the buffered image
Graphics2D g = bImage.createGraphics();

// Define the graph ...
RrdGraphDef rrdGraphDef = new RrdGraphDef ();

// Complete the graph definition

....

// Make the graph
RrdGraph rrdGraph = new RrdGraph (rrdGraphDef);

// render the graph
rrdGraph.render (g);

// Graphics context no longer needed so it can be disposed
g.dispose();