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fontsloth-point.el
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;;; fontsloth-point.el --- Fns for fontsloth-point type -*- lexical-binding: t -*-
;; Copyright (C) 2021 Jo Gay <[email protected]>
;; Author: Jo Gay <[email protected]>
;; Version: 0.17.0
;; Homepage: https://github.com/jollm/fontsloth
;; Keywords: data, font, ttf, otf
;; 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 <https://www.gnu.org/licenses/>.
;; This file is NOT part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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:
;; Part of fontsloth
;; fontsloth-point.el (this file): Fns for fontsloth-point type
;;; Code:
(require 'cl-lib)
(cl-defstruct
(fontsloth-point
(:constructor fontsloth-point-create)
(:copier nil))
(x 0.0 :type 'number)
(y 0.0 :type 'number))
(defun fontsloth-point-between (p1 p2 ratio)
"Given two points construct a point at ratio * distance between them.
P1 first point
P2 second point
RATIO ratio of distance for the new point, between 0.0 and 1.0"
(fontsloth-point-create
:x (+ (fontsloth-point-x p1)
(* ratio (- (fontsloth-point-x p2) (fontsloth-point-x p1))))
:y (+ (fontsloth-point-y p1)
(* ratio (- (fontsloth-point-y p2) (fontsloth-point-y p1))))))
(defun fontsloth-point-scale (p scale)
"Scale P given SCALE."
(setf (fontsloth-point-x p) (* scale (fontsloth-point-x p))
(fontsloth-point-y p) (* scale (fontsloth-point-y p))))
(defun fontsloth-point-distance-squared (p1 p2)
"Compute distance squared between points P1 and P2."
(let ((dx (- (fontsloth-point-x p1) (fontsloth-point-x p2)))
(dy (- (fontsloth-point-y p1) (fontsloth-point-y p2))))
(+ (* dx dx) (* dy dy))))
(provide 'fontsloth-point)
;;; fontsloth-point.el ends here