math - how SVG curveTo ( C ) works? -

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i need , confused little.

my question how svg curveto works, can't understand.

look example 

<svg height="400" width="400">  <path d="m 200 90 c 200  90 0 0 90  300 " stroke="black" fill="none" stroke-width="3"/> </svg>

this code draws shape

enter image description here

but can't understand how done , can't understand how curve identified , control points , 0 0 coordinate represents in example.

you drawing cubic bezier curve (with two control points). 1 of control points has same coordinates starting point.

  1. move (m) (200,90).

  2. draw cubic (c) bezier curve

    a. starting @ current position (200,90)
    b. first control point @ (200,90) - same starting point
    c. second control point @ (0,0)
    d. ending @ (90,300)


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