PTViewer Example
Viewer Instructions:
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Click and move the mouse to pan and tilt
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While panning, use control and shift keys to zoom in and
out.
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Alternatively, use the arrow keys for panning and tilting
in fixed increments.
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Use + and -, or > and < keys to zoom in fixed increments.
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Press the space bar to make hotspots visible; repress to
hide them again
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While over hotspot, click the mouse or press enter to jump
to link.