我正在使用PIL在我的项目中绘制Bezier曲线。我有绘制贝塞尔曲线的路径点。曲线正在绘制正确。但我想在图像上的特定帧上绘制贝塞尔曲线。我有以下数据：
{"frame":"89.062515,99.718819,175.781235,105.468742","path":
[{119.531258,4.687508,0.000000,0.000000},
{119.531258,4.687508,111.328133,4.687508},.......]}
我想在所属框架中显示路径。
这是我目前的代码：
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for image in images:
img = Image.open("/Users/priya/Gaurav/Axonator/media/app_data/AX_User_4_Image_16_October_2015_20_14_19.395_pm.jpeg").convert('RGBA')
draw = ImageDraw.Draw(img)
for annotation in image["annotations"]:
xys = []
frame = annotation["frame"].split(",")
for point in annotation["path"]:
pt = point["points"].split(",")
xys.append((pt[0],pt[1]))
bezier = make_bezier(xys)
points = bezier(ts)
print points
draw.polygon(points,outline="red")
img.save('out.png')
def make_bezier(xys):
# xys should be a sequence of 2-tuples (Bezier control points)
n = len(xys)
combinations = pascal_row(n-1)
def bezier(ts):
# This uses the generalized formula for bezier curves
# http://en.wikipedia.org/wiki/B%C3%A9zier_curve#Generalization
result = []
for t in ts:
tpowers = (t**i for i in range(n))
upowers = reversed([(1-t)**i for i in range(n)])
coefs = [c*a*b for c, a, b in zip(combinations, tpowers, upowers)]
result.append(
tuple(sum([float(coef)*float(p) for coef, p in zip(coefs, ps)]) for ps in zip(*xys)))
return result
return bezier
def pascal_row(n):
# This returns the nth row of Pascal's Triangle
result = [1]
x, numerator = 1, n
for denominator in range(1, n//2+1):
# print(numerator,denominator,x)
x *= numerator
x /= denominator
result.append(x)
numerator -= 1
if n&1 == 0:
# n is even
result.extend(reversed(result[:-1]))
else:
result.extend(reversed(result))
return result