how to set zoom level manually ?

[mohsenk]

Hi
thanks for this perfect chart library.
i have a small problem , in first time render chart labels are very close.
how i can set zoom manually in startup ?
i found this method , but dose not work

chart.zoom(0,0, -20);

[lecho]

Hi,
you are right, there was a problem with Chart.zoom() method, it didn't work for values below 0 and above 1.

I rewrote that method into new one Chart.setZoomLevel() and it's now in master branch. Let me know if that helps.

   /**
     * Programatically zoom chart to given point(viewport point). Call this method after chart data had been set.
     * 
     * @param x
     *            x within chart maximum viewport
     * @param y
     *            y within chart maximum viewport
     * @param zoomLevel
     *            value from 1 to maxZoom(default 14). 1 means chart has no zoom, 14 means chart has maximum zoom.
     * @param isAnimated
     *            set true if zoom should be animated.
     */
    public void setZoomLevel(float x, float y, float zoomLevel, boolean isAnimated);

Now you can zoom like that:

//set chart data first
chart.setLineChartData(yourData);
//zoom, in this example without animation
chart.setZoomLevel(chart.getMaximumViewport.centerX, chart.getMaximumViewport.centerY, newZoomLevel,  false);

So zoom should now work but I'm still not sure if this will solve your problem. Long labels are hard and slow to handle.

If you want to separate labels for X axis use axis.setMaxLabelChars() method.

Btw. you cannot zoom out beyond max viewport with Chart.setZoomLevel() method but you can change max viewport with Chart.setMaximumViewport() method.