Hi all,
I am implementing a program using the candlestick function which plots
some finance data.
After plotting some graph, I found that it doesn't follow the candlestick
charting convention according to:
http://stockcharts.com/school/doku.php?id=chart_school:chart_analysis:introduction_to_candlesticks
I have made some changes to candlestick in finance.py but I have no idea how
to modify candlestick2... because I am a python newbie.
I am posting the modified code to the list because I don't know how to get
it patched into the source control. Please let me know If I post it to the
wrong list.
----------------------------------------code section
begin-----------------------------
def candlestick(ax, quotes, width=0.2, colorup='k', colordown='r',
alpha=1.0):
"""
quotes is a list of (time, open, close, high, low, ...) tuples.
As long as the first 5 elements of the tuples are these values,
the tuple can be as long as you want (eg it may store volume).
time must be in float days format - see date2num
Plot the time, open, close, high, low as a vertical line ranging
from low to high. Use a rectangular bar to represent the
open-close span. If close >= open, use colorup to color the bar,
otherwise use colordown
ax : an Axes instance to plot to
width : fraction of a day for the rectangle width
colorup : the color of the rectangle where close >= open
colordown : the color of the rectangle where close < open
alpha : the rectangle alpha level
return value is lines, patches where lines is a list of lines
added and patches is a list of the rectangle patches added
"""
OFFSET = width/2.0
lines = []
patches = []
prev_close=-1
for q in quotes:
t, open, close, high, low = q[:5]
if(prev_close==-1 or close>=prev_close):
color_edge=colorup
else:
color_edge=colordown
prev_close=close
if close>=open :
color_body='w'
lower = open
height = close-open
vline1 = Line2D(
xdata=(t, t), ydata=(close, high),
color=color_edge,
linewidth=0.5,
antialiased=True,
)
vline2 = Line2D(
xdata=(t, t), ydata=(open, low),
color=color_edge,
linewidth=0.5,
antialiased=True,
)
else :
color_body = color_edge
lower = close
height = open-close
vline1 = Line2D(
xdata=(t, t), ydata=(close, low),
color=color_edge,
linewidth=0.5,
antialiased=True,
)
vline2 = Line2D(
xdata=(t, t), ydata=(open, high),
color=color_edge,
linewidth=0.5,
antialiased=True,
)
rect = Rectangle(
xy = (t-OFFSET, lower),
width = width,
height = height,
facecolor = color_body,
edgecolor = color_edge,
)
rect.set_alpha(alpha)
lines.append(vline1)
lines.append(vline2)
patches.append(rect)
ax.add_line(vline1)
ax.add_line(vline2)
ax.add_patch(rect)
ax.autoscale_view()
return lines, patches
----------------------------------------code section
end-----------------------------
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