16 lines
802 B
HTML
16 lines
802 B
HTML
---
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layout: strapless.html
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title: Layer Spy
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shortdesc: View a portion of one layer over another
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docs: >
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<p>Layer rendering can be manipulated in <code>precompose</code> and <code>postcompose</code> event listeners.
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These listeners get an event with a reference to the Canvas rendering context.
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In this example, the <code>precompose</code> listener sets a clipping mask around the most
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recent mouse position, giving you a spyglass effect for viewing one layer over another.</p>
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<p>Move around the map to see the effect. Use the ↑ up and ↓ down arrow keys to adjust the spyglass size.</p>
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tags: "spy, image manipulation"
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cloak:
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Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3: Your Bing Maps Key from http://bingmapsportal.com/ here
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---
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<div id="map" class="map"></div>
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