This demonstration shows a lens in a chart display that enables you to zoom locally to see more details. This small application is developed with ILOG Views Charts. You can move the lens to the left or to the right. You can also change the range or zoom factor of the lens, or switch to a polar representation.

The goal of this demo is to show:

• Polar and Cartesian Charts
• Local and global zoom
• Dynamic scales
• Editing points
• Advanced features of ILOG Views Charts

Downloading the demonstration

Please download the ZIP file for Window 95/98/NT/2000.
Please download the ZIP file for Window XP
No additional files will be downloaded to your hard disk.

Running the demonstration
This demonstration runs on PCs under Windows 98, Windows NT, Windows 2000 or Windows XP.

How to use the demonstration
This demo runs on PCs with Windows 95, Windows 98, Windows 2000, or Windows NT.

Controlling global zoom

• In Cartesian mode, drag a rectangle to zoom to a region of the chart.
• : Reset to the initial zoom level.

Controlling local zoom

• :  Moves the lens to the left or to the right.
• :  Changes the amount of data zoomed in the lens.
• :  Changes the zoom factor for the lens.
• :  Changes the connection of the lens in relation to the rest of the chart. In continuous mode, the rest of the chart is compressed to show all points. In non-continuous mode, the points that are hidden by the lens are displayed on the border of the lens.

Other features

• :  Switch to a polar display of the chart.
• :  Switch to a Cartesian display of the chart.
• :  Enables you to drag points with the mouse.

Technical highlights

Polar and Cartesian charts
ILOG Views Charts can display polar and Cartesian charts. In this demo, the same dataset can be connected to a polar or to a Cartesian chart. In addition, most of the features, like the local zoom, are available for both representation types.

Global zoom
The global zoom is achieved by changing the range to be displayed in the chart. The scales and the chart display adapt automatically to these new parameters. In the demo, global zoom is changed by dragging a rectangle that specifies the new range. This interactor is one of the predefined interactors delivered in ILOG Views Charts. The library contains an extension protocol to define new interaction modes.

Local zoom with a lens
ILOG Views Charts supports several types of coordinate transformation, such as linear transformation and logarithmic transformation (for logarithmic charts). Local zoom is an application of nonlinear coordinate transformation.