Get next X,Y of direction (angle)?

BlitzPlus Forums/BlitzPlus Programming/Get next X,Y of direction (angle)?

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How does one get the next x,y for movement along a hypothetical line the starts at a given x,y but continues in eternity pointing a certain angle from the start x,y?

Also, how do I get the angle of two pixels compared to each other (for example the one under left foot and the one under right foot of character) to detirmine proper tilt of character in relation to ground?