[elpa] 03/03: [xpm maint] Add debugging aid Emacs Lisp file.

[Thien-Thi Nguyen]

ttn pushed a commit to branch master
in repository elpa.

commit c2c7221e4283de4ea8ac94b7797726f91c929250
Author: Thien-Thi Nguyen <address@hidden>
Date:   Sat May 17 23:44:24 2014 +0200

    [xpm maint] Add debugging aid Emacs Lisp file.
    
    * packages/xpm/flower.el: New file.
    * packages/xpm/.elpaignore: Update.
---
 packages/xpm/.elpaignore |    1 +
 packages/xpm/flower.el   |  100 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 101 insertions(+), 0 deletions(-)

diff --git a/packages/xpm/.elpaignore b/packages/xpm/.elpaignore
index 5c374b1..dd69f33 100644
--- a/packages/xpm/.elpaignore
+++ b/packages/xpm/.elpaignore
@@ -1 +1,2 @@
 HACKING
+flower.el
diff --git a/packages/xpm/flower.el b/packages/xpm/flower.el
new file mode 100644
index 0000000..df154ba
--- /dev/null
+++ b/packages/xpm/flower.el
@@ -0,0 +1,100 @@
+;;; flower.el --- can `xpm-raster' DTRT?     -*- lexical-binding: t -*-
+
+;; Copyright (C) 2014  Free Software Foundation, Inc.
+
+;; 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:
+
+;; This file helps visualize `xpm-raster' failure modes.  Maybe one
+;; day it will be rendered useless by improvements to `xpm-raster'.
+;;
+;; NB: There is no `provide' form.
+;; NB: Loading munges the global keymap -- YHBW!
+
+;;; Code:
+
+(require 'xpm)
+(require 'xpm-m2z)
+(require 'cl-lib)
+
+(defun flower (&optional again)
+  "Stress `xpm-raster' in various ways."
+  (interactive "P")
+  (let ((buf (get-buffer "flower")))
+    (when buf (kill-buffer buf)))
+  (switch-to-buffer
+   (xpm-generate-buffer "flower" 99 99 2
+                        '(("  " . "green")
+                          (".." . "yellow")
+                          ("OO" . "red")
+                          ("--" . "black"))))
+  (setq truncate-lines t)
+  (let* ((τ (* 4 2 (atan 1)))
+         (half (/ 99 2.0))
+         (mag-fns (vector (lambda (θ) (ignore θ) 1)
+                          (lambda (θ) (sin θ))
+                          (lambda (θ) (cos θ))
+                          (lambda (θ) (sin (* 0.5 τ θ)))
+                          (lambda (θ) (cos (* 0.5 τ θ)))
+                          (lambda (θ) (sin (* 0.25 τ θ)))
+                          (lambda (θ) (cos (* 0.25 τ θ)))
+                          (lambda (θ) (sin (* τ θ)))
+                          (lambda (θ) (cos (* τ θ)))))
+         (n-mag-fns (length mag-fns)))
+    (cl-flet
+        ((random-mag-fn () (aref mag-fns (random n-mag-fns))))
+      (let* ((x-mag-fn (random-mag-fn))
+             (y-mag-fn (random-mag-fn))
+             (form (if again
+                       (get 'flower 'form)
+                     (delete-dups
+                      (if (zerop (random 5))
+                          (let ((one (xpm-m2z-circle
+                                      half half
+                                      (random 42)))
+                                (two (xpm-m2z-ellipse
+                                      half half
+                                      (random 42)
+                                      (random 42))))
+                            (append one two))
+                        (loop
+                         for θ below τ by 0.003
+                         collect
+                         (cl-flet
+                             ((at (f mfn)
+                                  (truncate (+ half (* 42 (funcall mfn θ)
+                                                       (funcall f θ))))))
+                           (cons (at 'cos x-mag-fn)
+                                 (at 'sin y-mag-fn)))))))))
+        (put 'flower 'form form)
+        (xpm-raster form "OO" ".."))))
+  (image-mode)
+  ;; strangely, image-mode screws up the markers, so we need to do
+  ;; this again if we want to do subsequent xpm-* access:
+  ;;+ (xpm-grok t)
+  t)
+
+;;;---------------------------------------------------------------------------
+;;; load-time actions
+
+(global-set-key [f9] 'flower)
+(global-set-key
+ [(meta f9)]
+ (lambda () (interactive)
+   (message "xpm-raster-inhibit-continuity-optimization now %s"
+            (setq xpm-raster-inhibit-continuity-optimization
+                  (not xpm-raster-inhibit-continuity-optimization)))))
+
+;;; flower.el ends here