def preload(g_range):
if g_range not in self.fig_cache:
fig = self.frame.plot(g_range.chrom, g_range.start,
g_range.end)
self.fig_cache[g_range] = fig2bytes(fig,
encode=self.img_format,
dpi=self.dpi)
def refresh(self, hard=False):
"""
Refresh the image display.
"""
if (self.current_range in self.fig_cache) and (not hard):
fig_bytes = self.fig_cache[self.current_range]
else:
fig_current = self.frame.show()
fig_bytes = fig2bytes(fig_current, encode=self.img_format, dpi=self.dpi)
if self.img_format == 'svg':
fig_bytes = fig_bytes.decode("utf-8")
self.fig_cache[self.current_range] = fig_bytes
# auto clear fig cache for prevent memory leak
if len(self.fig_cache) > 20 and \
get_size(self.fig_cache) >= BrowserBase.MAX_CACHE_SIZE:
self.clear_fig_cache()
self.widgets.frame_widget.value = fig_bytes
