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Learning Highcharts 4

You're reading from   Learning Highcharts 4 Design eye-catching and interactive JavaScript charts for your web page with Highcharts, one of the leading tools in web charting

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Product type Paperback
Published in Jan 2015
Publisher Packt
ISBN-13 9781783287451
Length 478 pages
Edition 2nd Edition
Languages
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Author (1):
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Joe Kuan Joe Kuan
Author Profile Icon Joe Kuan
Joe Kuan
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Table of Contents (17) Chapters Close

Preface 1. Web Charts 2. Highcharts Configurations FREE CHAPTER 3. Line, Area, and Scatter Charts 4. Bar and Column Charts 5. Pie Charts 6. Gauge, Polar, and Range Charts 7. Bubble, Box Plot, and Error Bar Charts 8. Waterfall, Funnel, Pyramid, and Heatmap Charts 9. 3D Charts 10. Highcharts APIs 11. Highcharts Events 12. Highcharts and jQuery Mobile 13. Highcharts and Ext JS 14. Server-side Highcharts 15. Highcharts Online Services and Plugins Index

Using a radial gradient on a gauge chart


The radial gradient setting is based on SVG. As its name implies, a radial gradient is color shading radiating outwards in a circular direction. Therefore, it requires three properties to define the gradient circle—cx, cy, and r. The gradient circle is the outermost circle for shading, such that no shading can go outside of this.

All the gradient positions are defined in ratio values between zero and one with respect to their containing elements. The cx and cy options are at the x, y center position of the outermost circle, whereas r is the radius of the outmost circle. If r is 0.5, it means the gradient radius is half the diameter of its element, the same size as the containing pane. In other words, the gradient starts from the center and goes all the way to the edge of the gauge. The stop offsets option works the same way as the linear gradient: the first parameter is the ratio position in the gradient circle to stop the shading. This controls the...

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