Changing chart header
Chart header usually provides brief description of the chart summary. Java Chart Designer allows setting the main title as well as subtitle.
To set/change chart header click "Options & Data" menu and choose "Chart header" or click "Options & Data" tab at Quick access panel and press "Chart header".

Let's overview each "Chart header" window items closer:
- Visible
"Visible" checkbox allows you to toggle chart header visibility. This control is replicated at "Options" tab next to "Chart header" button.
- Background color
"Background color" allows setting background header color:

- Color preview displays currently selected colors
- Color tab consists of 3 buttons placed vertically. First and last buttons open color selection dialog to select
colors that will be transposed one into another while middle button allows you to swap blending direction

Color selection dialog offers a set of predefined colors, allows changing hue value for each
of the colors constituents separately (RGB model) or composite color, turn on/off each of the color constituents as
well as change opacity.
- Direction tab lets you select from one of the 4 different transition directions: Vertical, Horizontal,
Diagonal Up, Diagonal Down
- "Number of cycles" spinbox allows setting/changing transition cycles. Assigning this value to "0" makes background
color consistent
Click "Ok" buttons to apply selected colors to your chart or "Cancel" to close this dialog window.
- "Title" and "Subtitle" tabs are very similar and allows settings up chart title and subtitle correspondingly. Each of the
tabs has Text field in order to set title/subtitle text, color selection dialog (similar to described above) to set text color and font selection dialog
to set up font's face and size
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