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Module Mgk

module Mgk: sig .. end

Interface for image-magick commands

type t

holds the command in progress

val new_genesis : unit -> t

initialise the command for a set of operations

val input_image : string -> t -> unit

filename of an image to load

val set_size : wh:int * int -> t -> unit

set dimensions of an image, a canvas, or a layer

val init_canvas : string -> t -> unit

you can initialise a transparent image with: "canvas:none"

val set_filename : string -> t -> unit

set the filename of the image containing the result

val write_command : t -> unit

output the resulting command on stdout to produce the requested operations

Draw

draw commands

val draw_line : int * int -> int * int -> t -> unit

draw operation with a line command

val draw_point : int * int -> t -> unit

draw operation with a point command

val draw_rectangle : int * int -> int * int -> t -> unit

draw operation with a rectangle command

val draw_circle : int * int -> int -> t -> unit

draw operation with a circle command

val draw_ellipse : int * int -> int * int -> t -> unit

draw operation with a ellipse command

val draw_qbcurve : int * int -> int * int -> int * int -> t -> unit

draw operation with a quadratic bezier curve command

val draw_cbcurve : int * int -> int * int -> int * int -> int * int -> t -> unit

draw operation with a cubic bezier curve command

val draw_polygon : (int * int) list -> t -> unit

draw operation with a rectangle command

val draw_text : int * int -> string -> t -> unit

draw operation with a text command

val set_font : string -> t -> unit

set the font for the draw-text operation

val set_pointsize : int -> t -> unit

set the size of the text in points

val set_strokewidth : float -> t -> unit

set the stroke-width for the draw operations

val set_fill : string -> t -> unit

set the fill color for the draw operations

val set_stroke : string -> t -> unit

set the stroke color for the draw operations

Layers

combine different layers

type comp_op = string

composite operator

val over : comp_op
val multiply : comp_op
val screen : comp_op
val overlay : comp_op
val darken : comp_op
val lighten : comp_op
val add : comp_op
val subtract : comp_op

most common composite operators

val compositeop_of_string : string -> comp_op

get a composite operator parameter from a string (read the image-magick documentation for a list of composite-operators)

val set_composite_op : comp_op -> t -> unit

select a composite operator

val composite : t -> unit

composite operation

val open_layer : (t -> unit) -> t -> unit

open a new layer

val set_geometry : int * int -> t -> unit

sets the position for the composition of a layer

Filters
val negate : t -> unit
val blur : int -> t -> unit
val normalize : t -> unit
val shade : int * int -> t -> unit
val modulate : int * int * int -> t -> unit

modulate, with brightness, saturation, hue parameters