title: Custom MKOverlayView line width
body: <p>I have a custom MKOverlayView, which draws a simple line. In <code>drawMapRect:</code> I am setting <code>CGContextSetLineWidth(context, 30);</code> This looks fine when completely zoomed in, but when you zoom out, the line becomes more and more thin. The MKOverlayView reference says that it automatically scales to the map's zoom level. How can I force it to draw the same width no matter what my zoom level? I notice that MKPolylineView (and MKPolygonView) do this correctly... you can see the line's width resize whenever you zoom to adjust to keep the same width. How can I do this in my overlayView?</p>