How to set the output format

Use the default output format

There is allways an output format configured.
OpenMap4u om4u = new OpenMap4u();
...
SetAreaOfInterestOrDrawOrWriteable myCanvas =  om4u.getCanvas(4, 1);
...
myCanvas.draw(
  om4u.get(Line.class).line(.25, .125, 3.75, 0.75)
).write("myLine.png");
Which results in the following output.
the result

Set a custom output format

OpenMap4u om4u = new OpenMap4u();
...
SetAreaOfInterestOrDrawOrWriteable myCanvas =  om4u.getCanvas(4, 1).outputFormat(Svg.class);
...
myCanvas.draw(
  om4u.get(Line.class).line(.25, .125, 3.75, 0.75)
).write("myLine.svg");
Which results in the following output.