<area shape="rect" href="$class_qwt_polar_curve.html" title="An item, that represents a series of points." alt="" coords="7,83,119,107"> <area shape="rect" href="$class_qwt_polar_grid.html" title="An item which draws scales and grid lines on a polar plot." alt="" coords="143,83,244,107"> <area shape="rect" href="$class_qwt_polar_marker.html" title="A class for drawing markers." alt="" coords="268,83,386,107"> <area shape="rect" href="$class_qwt_polar_spectrogram.html" title="An item, which displays a spectrogram." alt="" coords="410,83,564,107">