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Arguments:

• x0[%],y0[%],x1[%],y1[%],_thickness[%]>=0,_head_length[%]>=0,_head_thickness[%]>=0,_opacity,_pattern,_color1,...

Description:

Draw specified arrow on selected images.

pattern is an hexadecimal number starting with 0x which can be omitted
even if a color is specified. If a pattern is specified, the arrow is
drawn outlined instead of filled.

Default values:

thickness=1%, head_length=10%, head_thickness=3%, opacity=1, pattern=(undefined) and color1=0.

Example of use:

Command: 400,400,1,3 repeat 100 arrow 50%,50%,{u(100)}%,{u(100)}%,3,20,10,0.3,${-rgb} done