I was inpired by Excalibur333's platform example to try to animate a running cycle using GML.

I first used Excalibur333's code as a base for the person's upper leg animation:

//Right upper leg

angle[0] = 270 + (50*(sin(incr[0])))

incr[0]+=0.2

end_x[0] = x + lengthdir_x(50, angle[0] )

end_y[0] = y + lengthdir_y(50, angle[0] )

//Left upper leg

angle[2] = 270 + (50*(sin(incr[2])))

incr[2] -=0.2

end_x[2] = x + lengthdir_x(50, angle[2] )

end_y[2] = y + lengthdir_y(50, angle[2] )

After studying how a human runs and many hours of trial and error, I came up with the lower leg's animation:

//Right lower leg

angle[1] = 310 + (50*(sin(incr[1])))

incr[1]+=(50*(sin(incr[0])))/1000

end_x[1] = end_x[0] + lengthdir_x(50, angle[1] )

end_y[1] = end_y[0] + lengthdir_y(50, angle[1] )

//Left lower leg

angle[3] = 336 + (50*(sin(incr[3])))

incr[3] += (50*(sin(incr[0]*-1))))/1000

end_x[3] = end_x[2] + lengthdir_x(50, angle[3] )

end_y[3] = end_y[2] + lengthdir_y(50, angle[3] )

Feet:

//Right

foot_x[0] = end_x[1] + lengthdir_x(20, angle[1]-130 )

foot_y[0] = end_y[1] + lengthdir_y(20, angle[1]-130 )

//Left

foot_x[1] = end_x[3] + lengthdir_x(20, angle[3]-130 )

foot_y[1] = end_y[3] + lengthdir_y(20, angle[3]-130 )

Draw:

//Right

draw_line_width(x,y,end_x[0],end_y[0],5)

draw_line_width(end_x[0],end_y[0],end_x[1],end_y[1],5)

//Left

draw_line_width(x,y,end_x[2],end_y[2],5)

draw_line_width(end_x[2],end_y[2],end_x[3],end_y[3],5)

/Body Placeholder

draw_line_width(x,y,x-5,y-70,5)

//Feet

draw_line_width(end_x[1],end_y[1],foot_x[0],foot_y[0],10)

draw_line_width(end_x[3],end_y[3],foot_x[1],foot_y[1],10)

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I still have to do the arms, body head, etc. I may also try to do a walking animation as well.

Example