如何在 Roassal 3 中格式化图表？

Question

I made a chart following the examples in the documentation. I find the title and x/y labels too close to the plot itself, and the tick labels too small. How do I format them?

x := -3.14 to: 3.14 count: 100.
y := x sin.

c := RSChart new.
p := RSLinePlot new x: x y: y.
c addPlot: p.

c title: 'Sine function'.
c xlabel: 'X axis'.
c ylabel: 'Y axis'.

c addDecoration: RSHorizontalTick new.
c addDecoration: RSVerticalTick new.
c open

Answer 1

The way the graph is constructed it uses the default offset of 5 for X axis and -5 for Y axis in the initialize of RSXLabelDecoration or RSYLabelDecoration respectively.

To move the titles around you have to create them yourself instead of using xlabel or ylabel .

You whould have to replace these two lines of code:

c xlabel: 'X axis'.
c ylabel: 'Y axis'.

with:

xAxisDecoration := c addDecoration: (RSXLabelDecoration new title: 'X axis'; offset: 15).
yAxisDecoration := c addDecoration: (RSYLabelDecoration new title: 'Y axis'; offset: -15).

The result:

Edit - forgot about the tick labels

To adjust the font size you need to add a message fontSize when creating a RSHorizontal(Vertical)Tick

The affected code would look like this:

c addDecoration: (RSHorizontalTick new fontSize: 10).
c addDecoration: (RSVerticalTick new fontSize: 10).

Producing this result: