def generatePicture(self):
## pre-computing a QPicture object allows paint() to run much more quickly,
## rather than re-drawing the shapes every time.
self.picture = QtGui.QPicture()
p = QtGui.QPainter(self.picture)
p.setPen(pg.mkPen(color='w', width=0.4)) # 0.4 means w*2
# w = (self.data[1][0] - self.data[0][0]) / 3.
w = 0.2
for (t, open, close, min, max) in self.data:
p.drawLine(QtCore.QPointF(t, min), QtCore.QPointF(t, max))
if open > close:
p.setBrush(pg.mkBrush('g'))
else:
p.setBrush(pg.mkBrush('r'))
p.drawRect(QtCore.QRectF(t-w, open, w*2, close-open))
p.end()
def generatePicture(self):
## pre-computing a QPicture object allows paint() to run much more quickly,
## rather than re-drawing the shapes every time.
self.picture = QtGui.QPicture()
p = QtGui.QPainter(self.picture)
p.setPen(pg.mkPen(color='w')) # 0.4 means w*2, width=0.4
w = 0.2 # w*2是 阴线阳线宽度
# 用来记录上一个k线值 和打印更新的k线状态值
global pre
if len(self.data) == 0:
pass
elif len(self.data) < 2:
pre = self.data[0]
cur = self.data[0]
else:
cur = self.data[-1]
if pre == cur:
pass
else:
print cur
pre = cur
for (t, open_price, close_price, min_price,
max_price) in self.data:
'''
这里对画最高最低值的竖直线的一种意外情况的判断，
如果max和min一样，则画出来的直线实际上成了一个方块
'''
if abs(min_price - max_price) < 0.00000001:
pass # 如果最高价和最低价相同，则不绘制这直线
else:
p.drawLine(QtCore.QPointF(t, min_price),
QtCore.QPointF(t, max_price))
if open_price > close_price:
p.setBrush(pg.mkBrush('g'))
else:
p.setBrush(pg.mkBrush('r'))
# 绘制open和close的柱状图
p.drawRect(
QtCore.QRectF(t - w, open_price, w * 2,
close_price - open_price))
p.end()