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Make sure cairo transform accounts for frame center

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This commit is contained in:
Grant Sanderson 2018-08-13 14:12:45 -07:00
parent 109fe5c4ea
commit d6996452e5
1 changed files with 3 additions and 1 deletions
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4
camera/camera.py
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@ -301,6 +301,7 @@ class Camera(object):
ph = self.get_pixel_height()
fw = self.get_frame_width()
fh = self.get_frame_height()
fc = self.get_frame_center()
surface = cairo.ImageSurface.create_for_data(
pixel_array,
cairo.FORMAT_ARGB32,
@ -311,7 +312,8 @@ class Camera(object):
ctx.set_matrix(cairo.Matrix(
fdiv(pw, fw), 0,
0, -fdiv(ph, fh),
pw / 2, ph / 2,
(pw / 2) + fc[0] * fdiv(pw, fw),
(ph / 2) + fc[1] * fdiv(ph, fh),
))
self.cache_cairo_context(pixel_array, ctx)
return ctx