testCairo.py 文件源码

def barCoord(n):
    '''
    returns ((x-left-top, y-left-top),
            (x-left-buttom, y-right-buttom),
            (x-right-top, y-right-top),
            (x-right-buttom, y-right-buttom))
            coordinate of a bar area   
    '''
    return ((100 + (n % 6) * 380, 430 + (n // 6) * 331),                # left x-axis 100pt for margin blank    
            (100 + (n % 6) * 380, 430 + (n // 6) * 331 + 252),          # top  y-axis 430pt for title
            (100 + (n % 6) * 380 + 380, 430 + (n // 6) * 331),          # 252 is 1.5em for chord 1em * 3 for melody 56pt per em
            (100 + (n % 6) * 380 + 380, 430 + (n // 6) * 331 + 252))


# ctx = cairo.Context(cairo.PDFSurface("haha.pdf", 2480.0, 3508.0))
# ctx.set_font_size(30)
# ctx.select_font_face("FreeSerif", cairo.FONT_SLANT_NORMAL,
#                     cairo.FONT_WEIGHT_NORMAL)