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epaint-context.el
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epaint-context.el
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;;; epaint-canvas.el --- A simple paint tool for Emacs -*- lexical-binding: t; -*-
;; Copyright (C) 2016 chuntaro <chuntaro@sakura-games.jp>
;; Author: chuntaro <chuntaro@sakura-games.jp>
;; Maintainer: chuntaro <chuntaro@sakura-games.jp>
;; Version: 0.1.0
;; Package-Requires: ((emacs "24.4"))
;; Keywords: paint, mouse
;; URL: https://github.com/chuntaro/xxxxxx
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(require 'subr-x)
(require 'cl-macs)
(defvar epaint-draw-function-table)
(defvar epaint-internal-format)
;;; Graphics Context
(cl-defstruct (epaint-drawable (:conc-name epaint--))
bitmap
offset
width
height)
(defmacro epaint-with-drawable (spec-list object &rest body)
"Macro to directly access slots.
(epaint-with-drawable (bitmap width height) drawable
body)
|
v
(let ((bitmap (epaint--bitmap drawable))
(width (epaint--width drawable))
(height (epaint--height drawable)))
body)"
(declare (indent 2))
`(let ,(mapcar (lambda (entry)
(if (assq entry (cl-struct-slot-info 'epaint-drawable))
(list entry `(,(intern (concat "epaint--" (symbol-name entry))) ,object))
(warn "epaint-with-drawable: Unknown slot-name: `%s'" entry)))
spec-list)
,@body))
(defun epaint-drawable-create-image (drawable)
(create-image (epaint--bitmap drawable) epaint-internal-format t
:width (epaint--width drawable)
:height (epaint--height drawable)
;; text (or nil), arrow, hand, vdrag, hdrag, modeline, hourglass
:pointer 'arrow
:foreground "black"
:background "white"))
(defun epaint-drawable-regenerate (drawable width height)
(let ((new (epaint-drawable-create width height)))
(setf (epaint--bitmap drawable) (epaint--bitmap new)
(epaint--width drawable) (epaint--width new)
(epaint--height drawable) (epaint--height new)
(epaint--offset drawable) (epaint--offset new))
drawable))
(cl-defstruct (epaint-gc
(:constructor nil)
(:constructor make-epaint-gc
(&key
(color (epaint-lookup-color t))
&aux
(color (epaint-lookup-color color))
(shape 'freehand)
(draw-function (assq shape epaint-draw-function-table))
(draw-func (nth 1 draw-function))
(restore-p (not (null (nth 2 draw-function))))
(connect-p (not (null (nth 3 draw-function)))))))
color
(size 5)
shape
(current-x 0)
(current-y 0)
draw-func
restore-p
connect-p)
(defmacro epaint-with-gc (spec-list object &rest body)
"Macro to directly access slots.
(epaint-with-gc (color size shape) gc
body)
|
v
(let ((color (epaint-gc-color gc))
(size (epaint-gc-size gc))
(shape (epaint-gc-shape gc)))
body)"
(declare (indent 2))
`(let ,(mapcar (lambda (entry)
(if (assq entry (cl-struct-slot-info 'epaint-gc))
(list entry `(,(intern (concat "epaint-gc-" (symbol-name entry))) ,object))
(warn "epaint-with-gc: Unknown slot-name: `%s'" entry)))
spec-list)
,@body))
(defun epaint-gc-set-color (gc color)
(setf (epaint-gc-color gc) (epaint-lookup-color color))
gc)
(defun epaint-gc-change-shape (gc shape-symbol)
(when-let (draw-function (assq shape-symbol epaint-draw-function-table))
(setf (epaint-gc-shape gc) shape-symbol
(epaint-gc-draw-func gc) (nth 1 draw-function)
(epaint-gc-restore-p gc) (not (null (nth 2 draw-function)))
(epaint-gc-connect-p gc) (not (null (nth 3 draw-function)))))
gc)
(defun epaint-gc-set-pen-size (gc pen-size)
(setf (epaint-gc-size gc) pen-size)
gc)
(provide 'epaint-context)
;;; epaint-context.el ends here