| 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.TerminalPosition; |
| 22 | import com.googlecode.lanterna.TerminalSize; |
| 23 | import com.googlecode.lanterna.TextCharacter; |
| 24 | |
| 25 | import java.util.Arrays; |
| 26 | import java.util.Comparator; |
| 27 | |
| 28 | /** |
| 29 | * Default implementation of ShapeRenderer. This class (and the interface) is mostly here to make the code cleaner in |
| 30 | * {@code AbstractTextGraphics}. |
| 31 | * @author Martin |
| 32 | */ |
| 33 | class DefaultShapeRenderer implements ShapeRenderer { |
| 34 | interface Callback { |
| 35 | void onPoint(int column, int row, TextCharacter character); |
| 36 | } |
| 37 | |
| 38 | private final Callback callback; |
| 39 | |
| 40 | DefaultShapeRenderer(Callback callback) { |
| 41 | this.callback = callback; |
| 42 | } |
| 43 | |
| 44 | @Override |
| 45 | public void drawLine(TerminalPosition p1, TerminalPosition p2, TextCharacter character) { |
| 46 | //http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm |
| 47 | //Implementation from Graphics Programming Black Book by Michael Abrash |
| 48 | //Available at http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/graphics-programming-black-book-r1698 |
| 49 | if(p1.getRow() > p2.getRow()) { |
| 50 | TerminalPosition temp = p1; |
| 51 | p1 = p2; |
| 52 | p2 = temp; |
| 53 | } |
| 54 | int deltaX = p2.getColumn() - p1.getColumn(); |
| 55 | int deltaY = p2.getRow() - p1.getRow(); |
| 56 | if(deltaX > 0) { |
| 57 | if(deltaX > deltaY) { |
| 58 | drawLine0(p1, deltaX, deltaY, true, character); |
| 59 | } |
| 60 | else { |
| 61 | drawLine1(p1, deltaX, deltaY, true, character); |
| 62 | } |
| 63 | } |
| 64 | else { |
| 65 | deltaX = Math.abs(deltaX); |
| 66 | if(deltaX > deltaY) { |
| 67 | drawLine0(p1, deltaX, deltaY, false, character); |
| 68 | } |
| 69 | else { |
| 70 | drawLine1(p1, deltaX, deltaY, false, character); |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | private void drawLine0(TerminalPosition start, int deltaX, int deltaY, boolean leftToRight, TextCharacter character) { |
| 76 | int x = start.getColumn(); |
| 77 | int y = start.getRow(); |
| 78 | int deltaYx2 = deltaY * 2; |
| 79 | int deltaYx2MinusDeltaXx2 = deltaYx2 - (deltaX * 2); |
| 80 | int errorTerm = deltaYx2 - deltaX; |
| 81 | callback.onPoint(x, y, character); |
| 82 | while(deltaX-- > 0) { |
| 83 | if(errorTerm >= 0) { |
| 84 | y++; |
| 85 | errorTerm += deltaYx2MinusDeltaXx2; |
| 86 | } |
| 87 | else { |
| 88 | errorTerm += deltaYx2; |
| 89 | } |
| 90 | x += leftToRight ? 1 : -1; |
| 91 | callback.onPoint(x, y, character); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | private void drawLine1(TerminalPosition start, int deltaX, int deltaY, boolean leftToRight, TextCharacter character) { |
| 96 | int x = start.getColumn(); |
| 97 | int y = start.getRow(); |
| 98 | int deltaXx2 = deltaX * 2; |
| 99 | int deltaXx2MinusDeltaYx2 = deltaXx2 - (deltaY * 2); |
| 100 | int errorTerm = deltaXx2 - deltaY; |
| 101 | callback.onPoint(x, y, character); |
| 102 | while(deltaY-- > 0) { |
| 103 | if(errorTerm >= 0) { |
| 104 | x += leftToRight ? 1 : -1; |
| 105 | errorTerm += deltaXx2MinusDeltaYx2; |
| 106 | } |
| 107 | else { |
| 108 | errorTerm += deltaXx2; |
| 109 | } |
| 110 | y++; |
| 111 | callback.onPoint(x, y, character); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | @Override |
| 116 | public void drawTriangle(TerminalPosition p1, TerminalPosition p2, TerminalPosition p3, TextCharacter character) { |
| 117 | drawLine(p1, p2, character); |
| 118 | drawLine(p2, p3, character); |
| 119 | drawLine(p3, p1, character); |
| 120 | } |
| 121 | |
| 122 | @Override |
| 123 | public void drawRectangle(TerminalPosition topLeft, TerminalSize size, TextCharacter character) { |
| 124 | TerminalPosition topRight = topLeft.withRelativeColumn(size.getColumns() - 1); |
| 125 | TerminalPosition bottomRight = topRight.withRelativeRow(size.getRows() - 1); |
| 126 | TerminalPosition bottomLeft = topLeft.withRelativeRow(size.getRows() - 1); |
| 127 | drawLine(topLeft, topRight, character); |
| 128 | drawLine(topRight, bottomRight, character); |
| 129 | drawLine(bottomRight, bottomLeft, character); |
| 130 | drawLine(bottomLeft, topLeft, character); |
| 131 | } |
| 132 | |
| 133 | @Override |
| 134 | public void fillTriangle(TerminalPosition p1, TerminalPosition p2, TerminalPosition p3, TextCharacter character) { |
| 135 | //I've used the algorithm described here: |
| 136 | //http://www-users.mat.uni.torun.pl/~wrona/3d_tutor/tri_fillers.html |
| 137 | TerminalPosition[] points = new TerminalPosition[]{p1, p2, p3}; |
| 138 | Arrays.sort(points, new Comparator<TerminalPosition>() { |
| 139 | @Override |
| 140 | public int compare(TerminalPosition o1, TerminalPosition o2) { |
| 141 | return (o1.getRow() < o2.getRow()) ? -1 : ((o1.getRow() == o2.getRow()) ? 0 : 1); |
| 142 | } |
| 143 | }); |
| 144 | |
| 145 | float dx1, dx2, dx3; |
| 146 | if (points[1].getRow() - points[0].getRow() > 0) { |
| 147 | dx1 = (float)(points[1].getColumn() - points[0].getColumn()) / (float)(points[1].getRow() - points[0].getRow()); |
| 148 | } |
| 149 | else { |
| 150 | dx1 = 0; |
| 151 | } |
| 152 | if (points[2].getRow() - points[0].getRow() > 0) { |
| 153 | dx2 = (float)(points[2].getColumn() - points[0].getColumn()) / (float)(points[2].getRow() - points[0].getRow()); |
| 154 | } |
| 155 | else { |
| 156 | dx2 = 0; |
| 157 | } |
| 158 | if (points[2].getRow() - points[1].getRow() > 0) { |
| 159 | dx3 = (float)(points[2].getColumn() - points[1].getColumn()) / (float)(points[2].getRow() - points[1].getRow()); |
| 160 | } |
| 161 | else { |
| 162 | dx3 = 0; |
| 163 | } |
| 164 | |
| 165 | float startX, startY, endX; |
| 166 | startX = endX = points[0].getColumn(); |
| 167 | startY = points[0].getRow(); |
| 168 | if (dx1 > dx2) { |
| 169 | for (; startY <= points[1].getRow(); startY++, startX += dx2, endX += dx1) { |
| 170 | drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character); |
| 171 | } |
| 172 | endX = points[1].getColumn(); |
| 173 | for (; startY <= points[2].getRow(); startY++, startX += dx2, endX += dx3) { |
| 174 | drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character); |
| 175 | } |
| 176 | } else { |
| 177 | for (; startY <= points[1].getRow(); startY++, startX += dx1, endX += dx2) { |
| 178 | drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character); |
| 179 | } |
| 180 | startX = points[1].getColumn(); |
| 181 | startY = points[1].getRow(); |
| 182 | for (; startY <= points[2].getRow(); startY++, startX += dx3, endX += dx2) { |
| 183 | drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character); |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | @Override |
| 189 | public void fillRectangle(TerminalPosition topLeft, TerminalSize size, TextCharacter character) { |
| 190 | for(int y = 0; y < size.getRows(); y++) { |
| 191 | for(int x = 0; x < size.getColumns(); x++) { |
| 192 | callback.onPoint(topLeft.getColumn() + x, topLeft.getRow() + y, character); |
| 193 | } |
| 194 | } |
| 195 | } |
| 196 | } |