我設法使用pycairo創建pdf報告。封面很好,但我需要改變其方向的第二頁取決於圖的大小。如何使用pycairo設置一個頁面橫向和一個頁面縱向。謝謝。使用pycairo設置PDF文件的橫向方向
這裏是我的函數生成第二頁:
def draw_pedigree(ctx, path_to_image, left, top, container_width, container_height):
# create a new page to draw a pedigree
ctx.show_page()
ctx.save()
# load image from input path
image_surface = cairo.ImageSurface.create_from_png(path_to_image)
img_height = image_surface.get_height()
img_width = image_surface.get_width()
print "img_height: %d" % img_height
print "img_width: %d" % img_width
print "container_height: %d" % container_height
print "container_width: %d" % container_width
if (img_width <= container_width and img_height <= container_height): # this case the image don't need to be scaled or rotated
ctx.translate(left, top)
ctx.set_source_surface(image_surface)
ctx.paint()
ctx.restore()
else: # this case the image need to be scaled
# check should image be rotated or not
if(float(img_height)/float(img_width) <= 0.875): # rotate the image
width_ratio = float(container_height)/float(img_width)
height_ratio = float(container_width)/float(img_height)
scale_xy = min(height_ratio, width_ratio)
print "scale_xy: %f" % scale_xy
ctx.translate(545, top)
ctx.rotate(math.pi/2)
if(scale_xy < 1):
ctx.scale(scale_xy, scale_xy)
ctx.set_source_surface(image_surface)
ctx.paint()
ctx.restore()
else: # don't rotate the image
# calculate proportional scaling
width_ratio = float(container_width)/float(img_width)
height_ratio = float(container_height)/float(img_height)
scale_xy = min(height_ratio, width_ratio)
ctx.scale(scale_xy, scale_xy)
ctx.translate(left, top)
ctx.set_source_surface(image_surface)
ctx.paint()
ctx.restore()
到目前爲止,我試圖縮放圖,以便它總是會融入網頁,如果它的寬度過長旋轉。 –