/*
* This file is part of lanterna (https://github.com/mabe02/lanterna).
*
* lanterna is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (C) 2010-2020 Martin Berglund
*/
package com.googlecode.lanterna.graphics;
import com.googlecode.lanterna.TextCharacter;
import com.googlecode.lanterna.TerminalPosition;
import com.googlecode.lanterna.TerminalSize;
This implementation of TextGraphics will take a 'proper' object and composite a view on top of it, by using a
top-left position and a size. Any attempts to put text outside of this area will be dropped.
Author: Martin
/**
* This implementation of TextGraphics will take a 'proper' object and composite a view on top of it, by using a
* top-left position and a size. Any attempts to put text outside of this area will be dropped.
* @author Martin
*/
class SubTextGraphics extends AbstractTextGraphics {
private final TextGraphics underlyingTextGraphics;
private final TerminalPosition topLeft;
private final TerminalSize writableAreaSize;
SubTextGraphics(TextGraphics underlyingTextGraphics, TerminalPosition topLeft, TerminalSize writableAreaSize) {
this.underlyingTextGraphics = underlyingTextGraphics;
this.topLeft = topLeft;
this.writableAreaSize = writableAreaSize;
}
private TerminalPosition project(int column, int row) {
return topLeft.withRelative(column, row);
}
@Override
public TextGraphics setCharacter(int columnIndex, int rowIndex, TextCharacter textCharacter) {
TerminalSize writableArea = getSize();
if(columnIndex < 0 || columnIndex >= writableArea.getColumns() ||
rowIndex < 0 || rowIndex >= writableArea.getRows()) {
return this;
}
TerminalPosition projectedPosition = project(columnIndex, rowIndex);
underlyingTextGraphics.setCharacter(projectedPosition, textCharacter);
return this;
}
@Override
public TerminalSize getSize() {
return writableAreaSize;
}
@Override
public TextCharacter getCharacter(int column, int row) {
TerminalPosition projectedPosition = project(column, row);
return underlyingTextGraphics.getCharacter(projectedPosition.getColumn(), projectedPosition.getRow());
}
}