PlotCurveItem.py 文件源码

def generatePath(self, x, y):
        if self.opts['stepMode']:
            ## each value in the x/y arrays generates 2 points.
            x2 = np.empty((len(x),2), dtype=x.dtype)
            x2[:] = x[:,np.newaxis]
            if self.opts['fillLevel'] is None:
                x = x2.reshape(x2.size)[1:-1]
                y2 = np.empty((len(y),2), dtype=y.dtype)
                y2[:] = y[:,np.newaxis]
                y = y2.reshape(y2.size)
            else:
                ## If we have a fill level, add two extra points at either end
                x = x2.reshape(x2.size)
                y2 = np.empty((len(y)+2,2), dtype=y.dtype)
                y2[1:-1] = y[:,np.newaxis]
                y = y2.reshape(y2.size)[1:-1]
                y[0] = self.opts['fillLevel']
                y[-1] = self.opts['fillLevel']

        path = fn.arrayToQPath(x, y, connect=self.opts['connect'])

        return path