ui/src/main/java/ucar/nc2/ui/image/PicturePane.java
public void scrollLeft() {
		// if the bottom edge of the picture is visible, do not scroll
		if (((sclPic.getOriginalWidth() - focusPoint.x) * sclPic.getScaleFactor()) + getSize().width /2 > getSize().width) {
			focusPoint.x = focusPoint.x + (int) (getSize().width * 0.1 / sclPic.getScaleFactor()) ;
			repaint();
		} else {
			Tools.log("Scrollup rejected because right edge of picture is already showing.");
		}
	}
public void scrollLeft() {
		// if the bottom edge of the picture is visible, do not scroll
		if (((sclPic.getOriginalWidth() - focusPoint.x) * sclPic.getScaleFactor()) + getSize().width /2 > getSize().width) {
			focusPoint.x = focusPoint.x + (int) (getSize().width * 0.1 / sclPic.getScaleFactor()) ;
			repaint();
		} else {
			Tools.log("Scrollup rejected because right edge of picture is already showing.");
		}
	}
method that moves the image left by 10% of the pixels shown on the screen.
This method
calls <code>repaint()</code> directly since no time consuming image operations need to take place.
works just liks {@link #scrollUp()}.
@see #scrollUp()
@see #scrollDown()
@see #scrollLeft()
@see #scrollRight()