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a3b510ab NR |
1 | /* |
2 | * This file is part of lanterna (http://code.google.com/p/lanterna/). | |
3 | * | |
4 | * lanterna is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU Lesser General Public License as published by | |
6 | * the Free Software Foundation, either version 3 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | * | |
17 | * Copyright (C) 2010-2015 Martin | |
18 | */ | |
19 | package com.googlecode.lanterna.graphics; | |
20 | ||
21 | import com.googlecode.lanterna.TextCharacter; | |
22 | import com.googlecode.lanterna.TerminalPosition; | |
23 | import com.googlecode.lanterna.TerminalSize; | |
24 | ||
25 | /** | |
26 | * This implementation of TextGraphics will take a 'proper' object and composite a view on top of it, by using a | |
27 | * top-left position and a size. Any attempts to put text outside of this area will be dropped. | |
28 | * @author Martin | |
29 | */ | |
30 | class SubTextGraphics extends AbstractTextGraphics { | |
31 | private final TextGraphics underlyingTextGraphics; | |
32 | private final TerminalPosition topLeft; | |
33 | private final TerminalSize writableAreaSize; | |
34 | ||
35 | SubTextGraphics(TextGraphics underlyingTextGraphics, TerminalPosition topLeft, TerminalSize writableAreaSize) { | |
36 | this.underlyingTextGraphics = underlyingTextGraphics; | |
37 | this.topLeft = topLeft; | |
38 | this.writableAreaSize = writableAreaSize; | |
39 | } | |
40 | ||
41 | private TerminalPosition project(int column, int row) { | |
42 | return topLeft.withRelative(column, row); | |
43 | } | |
44 | ||
45 | @Override | |
46 | public TextGraphics setCharacter(int columnIndex, int rowIndex, TextCharacter textCharacter) { | |
47 | TerminalSize writableArea = getSize(); | |
48 | if(columnIndex < 0 || columnIndex >= writableArea.getColumns() || | |
49 | rowIndex < 0 || rowIndex >= writableArea.getRows()) { | |
50 | return this; | |
51 | } | |
52 | TerminalPosition projectedPosition = project(columnIndex, rowIndex); | |
53 | underlyingTextGraphics.setCharacter(projectedPosition, textCharacter); | |
54 | return this; | |
55 | } | |
56 | ||
57 | @Override | |
58 | public TerminalSize getSize() { | |
59 | return writableAreaSize; | |
60 | } | |
61 | ||
62 | @Override | |
63 | public TextCharacter getCharacter(int column, int row) { | |
64 | TerminalPosition projectedPosition = project(column, row); | |
65 | return underlyingTextGraphics.getCharacter(projectedPosition.getColumn(), projectedPosition.getRow()); | |
66 | } | |
67 | } |