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    <p>I cannot share code of my custom renderer, so here are general architecture:</p> <ol> <li><p>A <strong>MapView</strong> (extends <strong>View</strong>) component with <strong>pan</strong> and <strong>zoom</strong> properties and list of <strong>MapLayers</strong></p></li> <li><p>A <strong>MapLayer</strong> abstract class with <strong>onClick</strong> and <strong>render</strong> methods. This class has two subclasses:</p> <p>2.1. A <strong>GridLayer</strong> class which <strong>render</strong> methods draws grid depending on <strong>MapView</strong>'s <strong>pan</strong> and <strong>zoom</strong></p> <p>2.2. A <strong>MarkerLayer</strong> class which stores <strong>Markers</strong> and renders them.</p></li> <li><p><strong>Marker</strong> stores <strong>latitude</strong>, <strong>longitude</strong> and also HashMap of <strong>attributes</strong> (such as color, id etc)</p></li> <li><p>To map <strong>Marker</strong>'s <strong>latitude</strong> and <strong>longitude</strong> to <strong>MapView</strong>'s x and y I use instance <strong>IProjector</strong> interface, currently - Mercator Projector with formulas from Wikipedia</p></li> <li><p>To render <strong>Marker</strong>'s <strong>MarkerLayer</strong> uses instance of <strong>MarkerRenderer</strong> abstract class. I have two <strong>MarkerRenderers</strong>: <strong>SimpleMarkerRenderer</strong>, which draws circles (their stroke and fill colors are taken from <strong>Marker</strong>'s <strong>attributes</strong>), and <strong>ImageMarkerRenderer</strong>, which draws images (image ids taken from <strong>Marker</strong>'s <strong>attributes</strong>)</p></li> </ol>
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