Controlling Chart Bar Colors

Question

Hello, I'm just beginning to add charts to my application and I'm finding it difficult to control Chart bar color dynamically. I would like Red, Yellow, Green bars based on limits on the Bar value. Example Values under 5 may be Green, 5 - 9 Yellow, and over 10 Red. The HTML chart appears to either be Random or one Specifc color, and the SVG Chart appears to only be a sinlge color. Both are chosen on the attribute screen of the chart.
Anyone done Dynamic Chart Bar coloring? - Thanks

Answer 1

Hi, and welcome!
Have a look at: [http://apex.oracle.com/pls/otn/f?p=44602:2]
To get this on a Flash Chart, I have:
1 - Set the chart type to: Stacked 2D Column
2 - Set the Color Scheme setting to: Custom
3 - Set the Custom Colors to: red,yellow,green
4 - Created THREE series (with a maximum of 15 rows each) with the following SQL statements:
Series 1:
SELECT NULL LINK, ENAME LABEL, CASE WHEN SAL < 1000 THEN SAL ELSE 0 END VALUE FROM EMP WHERE SAL IS NOT NULL ORDER BY ENAME
Series 2:
SELECT NULL LINK, ENAME LABEL, CASE WHEN SAL BETWEEN 1000 AND 2000 THEN SAL ELSE 0 END VALUE FROM EMP WHERE SAL IS NOT NULL ORDER BY ENAME
Series 3:
SELECT NULL LINK, ENAME LABEL, CASE WHEN SAL > 2000 THEN SAL ELSE 0 END VALUE FROM EMP WHERE SAL IS NOT NULL ORDER BY ENAME
As long as my SQL is correct and the SAL value ranges don't overlap, each ENAME entry will appear in one, and only one, series - for the other two series, the value will be reset to 0, so nothing is shown.
Andy