adafruit-mirror/Adafruit_CircuitPython_framebuf
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Merge pull request #24 from boo13/draw-circle

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Add ability to draw circle
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Melissa LeBlanc-Williams 2019-10-22 12:08:59 -07:00 committed by GitHub
commit c22eca9304
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 26 additions and 0 deletions
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adafruit_framebuf.py
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@ -215,6 +215,32 @@ class FrameBuffer:
"""Draw a vertical line up to a given length."""
self.rect(x, y, 1, height, color, fill=True)
def circle(self, center_x, center_y, radius, color):
"""Draw a circle at the given midpoint location, radius and color.
The ```circle``` method draws only a 1 pixel outline."""
x = radius - 1
y = 0
d_x = 1
d_y = 1
err = d_x - (radius << 1)
while x >= y:
self.pixel(center_x + x, center_y + y, color)
self.pixel(center_x + y, center_y + x, color)
self.pixel(center_x - y, center_y + x, color)
self.pixel(center_x - x, center_y + y, color)
self.pixel(center_x - x, center_y - y, color)
self.pixel(center_x - y, center_y - x, color)
self.pixel(center_x + y, center_y - x, color)
self.pixel(center_x + x, center_y - y, color)
if err <= 0:
y += 1
err += d_y
d_y += 2
if err > 0:
x -= 1
d_x += 2
err += d_x - (radius << 1)
def rect(self, x, y, width, height, color, *, fill=False):
"""Draw a rectangle at the given location, size and color. The ```rect``` method draws only
a 1 pixel outline."""