1 /* Communication module for Android terminals. -*- c-file-style: "GNU" -*-
2
3 Copyright (C) 2023 Free Software Foundation, Inc.
4
5 This file is part of GNU Emacs.
6
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or (at
10 your option) any later version.
11
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
19
20 package org.gnu.emacs;
21
22 import android.graphics.Canvas;
23 import android.graphics.Paint;
24 import android.graphics.Rect;
25
26 public final class EmacsDrawLine
27 {
28 public static void
29 perform (EmacsDrawable drawable, EmacsGC gc,
30 int x, int y, int x2, int y2)
31 {
32 Rect rect;
33 Canvas canvas;
34 Paint paint;
35 int x0, x1, y0, y1;
36
37 /* TODO implement stippling. */
38 if (gc.fill_style == EmacsGC.GC_FILL_OPAQUE_STIPPLED)
39 return;
40
41 /* Calculate the leftmost and rightmost points. */
42
43 x0 = Math.min (x, x2 + 1);
44 x1 = Math.max (x, x2 + 1);
45 y0 = Math.min (y, y2 + 1);
46 y1 = Math.max (y, y2 + 1);
47
48 /* And the clip rectangle. */
49
50 paint = gc.gcPaint;
51 rect = new Rect (x0, y0, x1, y1);
52 canvas = drawable.lockCanvas (gc);
53
54 if (canvas == null)
55 return;
56
57 paint.setStyle (Paint.Style.FILL);
58
59 /* Since drawLine has PostScript style behavior, adjust the
60 coordinates appropriately.
61
62 The left most pixel of a straight line is always partially
63 filled. Patch it in manually. */
64
65 if (gc.clip_mask == null)
66 {
67 canvas.drawLine ((float) x + 0.5f, (float) y + 0.5f,
68 (float) x2 + 0.5f, (float) y2 + 0.5f,
69 paint);
70
71 if (x2 > x)
72 canvas.drawRect (new Rect (x, y, x + 1, y + 1), paint);
73 }
74
75 /* DrawLine with clip mask not implemented; it is not used by
76 Emacs. */
77 drawable.damageRect (rect);
78 }
79 }