<image> The figure shows part of the graph of the function $$f(x)=\tan ( \dfrac {π}{4}x- \dfrac {π}{2})$$. Point $$A$$ is the first zero point of the function $$f(x)$$ to the right of the y-axis, and point $$B$$ is on the graph of the function $$f(x)$$ with a y-coordinate of $$1$$. The angle of inclination of the line $$AB$$ is equal to ______ .