Circle Drawing Using Polar Coordinates
Polar Coordinates:
Radius r
Angle
calculate points along the circular boundary
using polar coordinates r and
Expressing the circle equation in parametric polar form yields the pair of
equations:
x = xc + r cos
y = yc + r sin
Using above equation circle can be plotted by calculating x and y
coordinates as takes values from 0 to 360 degrees or 0 to 2 radians.
The step size for depends on:
. application and
. display device
Larger angular separations along the circumference can be connected with
straight-line segments to approximate the circular path.
Step size at 1/r gives continuous boundary
This plots pixel positions that are approximately one unit apart.
Circle2 (xcenter, ycenter, radius)
for = 0 to 2 step 1/r
x = xc + r * cos
y = yc + r * sin
drawPixel (x, y)
Drawbacks/ Shortcomings
