// override me
public void doZoomIn(Rectangle rbRect) {
int x = rbRect.x - mLeft - 5;
int y = rbRect.y - mTop - 5;
// zoom in
double xInc = getXZoomIncrement();
double yInc = getYZoomIncrement();
// get coordinates of new view center
// correct the x value if necessary
double xx = correctX((double) x);
// correct the Y coordinate if necessary
double yy = correctY((double) y);
double newXCtr = (xx / winXScale) + winXOrigin;
double newYCtr = (yy / winYScale) + winYOrigin;
// compute the deltas for current range
double xDelta = Math.abs(getMaxXVal() - getMinXVal()) / 2.0;
double yDelta = Math.abs(getMaxYVal() - getMinYVal()) / 2.0;
// compute the aspect ratio of the few
double aspect = xDelta / yDelta;
// if (aspect > 1.0)
// xInc *= aspect;
// else
// yInc *= aspect;
double newXMin = newXCtr < 0 ? newXCtr - xDelta + xInc : newXCtr - xDelta + xInc;
double newXMax = newXCtr < 0 ? newXCtr + xDelta - xInc : newXCtr + xDelta - xInc;
double newYMin = newYCtr < 0 ? newYCtr - yDelta + yInc : newYCtr - yDelta + yInc;
double newYMax = newYCtr < 0 ? newYCtr + yDelta - yInc : newYCtr + yDelta - yInc;
double[] oldYs = {getMinYVal(), getMaxYVal()};
double[] newYs = {newYMin, newYMax};
double[] oldXs = {getMinXVal(), getMaxXVal()};
double[] newXs = {newXMin, newXMax};
this.zoomDomain(oldYs, newYs, oldXs, newXs);
}
