+++ /dev/null
-/*
- * This file is part of lanterna (http://code.google.com/p/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) 2010-2015 Martin
- */
-package com.googlecode.lanterna.graphics;
-
-import com.googlecode.lanterna.TerminalPosition;
-import com.googlecode.lanterna.TerminalSize;
-import com.googlecode.lanterna.TextCharacter;
-
-import java.util.Arrays;
-import java.util.Comparator;
-
-/**
- * Default implementation of ShapeRenderer. This class (and the interface) is mostly here to make the code cleaner in
- * {@code AbstractTextGraphics}.
- * @author Martin
- */
-class DefaultShapeRenderer implements ShapeRenderer {
- interface Callback {
- void onPoint(int column, int row, TextCharacter character);
- }
-
- private final Callback callback;
-
- DefaultShapeRenderer(Callback callback) {
- this.callback = callback;
- }
-
- @Override
- public void drawLine(TerminalPosition p1, TerminalPosition p2, TextCharacter character) {
- //http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
- //Implementation from Graphics Programming Black Book by Michael Abrash
- //Available at http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/graphics-programming-black-book-r1698
- if(p1.getRow() > p2.getRow()) {
- TerminalPosition temp = p1;
- p1 = p2;
- p2 = temp;
- }
- int deltaX = p2.getColumn() - p1.getColumn();
- int deltaY = p2.getRow() - p1.getRow();
- if(deltaX > 0) {
- if(deltaX > deltaY) {
- drawLine0(p1, deltaX, deltaY, true, character);
- }
- else {
- drawLine1(p1, deltaX, deltaY, true, character);
- }
- }
- else {
- deltaX = Math.abs(deltaX);
- if(deltaX > deltaY) {
- drawLine0(p1, deltaX, deltaY, false, character);
- }
- else {
- drawLine1(p1, deltaX, deltaY, false, character);
- }
- }
- }
-
- private void drawLine0(TerminalPosition start, int deltaX, int deltaY, boolean leftToRight, TextCharacter character) {
- int x = start.getColumn();
- int y = start.getRow();
- int deltaYx2 = deltaY * 2;
- int deltaYx2MinusDeltaXx2 = deltaYx2 - (deltaX * 2);
- int errorTerm = deltaYx2 - deltaX;
- callback.onPoint(x, y, character);
- while(deltaX-- > 0) {
- if(errorTerm >= 0) {
- y++;
- errorTerm += deltaYx2MinusDeltaXx2;
- }
- else {
- errorTerm += deltaYx2;
- }
- x += leftToRight ? 1 : -1;
- callback.onPoint(x, y, character);
- }
- }
-
- private void drawLine1(TerminalPosition start, int deltaX, int deltaY, boolean leftToRight, TextCharacter character) {
- int x = start.getColumn();
- int y = start.getRow();
- int deltaXx2 = deltaX * 2;
- int deltaXx2MinusDeltaYx2 = deltaXx2 - (deltaY * 2);
- int errorTerm = deltaXx2 - deltaY;
- callback.onPoint(x, y, character);
- while(deltaY-- > 0) {
- if(errorTerm >= 0) {
- x += leftToRight ? 1 : -1;
- errorTerm += deltaXx2MinusDeltaYx2;
- }
- else {
- errorTerm += deltaXx2;
- }
- y++;
- callback.onPoint(x, y, character);
- }
- }
-
- @Override
- public void drawTriangle(TerminalPosition p1, TerminalPosition p2, TerminalPosition p3, TextCharacter character) {
- drawLine(p1, p2, character);
- drawLine(p2, p3, character);
- drawLine(p3, p1, character);
- }
-
- @Override
- public void drawRectangle(TerminalPosition topLeft, TerminalSize size, TextCharacter character) {
- TerminalPosition topRight = topLeft.withRelativeColumn(size.getColumns() - 1);
- TerminalPosition bottomRight = topRight.withRelativeRow(size.getRows() - 1);
- TerminalPosition bottomLeft = topLeft.withRelativeRow(size.getRows() - 1);
- drawLine(topLeft, topRight, character);
- drawLine(topRight, bottomRight, character);
- drawLine(bottomRight, bottomLeft, character);
- drawLine(bottomLeft, topLeft, character);
- }
-
- @Override
- public void fillTriangle(TerminalPosition p1, TerminalPosition p2, TerminalPosition p3, TextCharacter character) {
- //I've used the algorithm described here:
- //http://www-users.mat.uni.torun.pl/~wrona/3d_tutor/tri_fillers.html
- TerminalPosition[] points = new TerminalPosition[]{p1, p2, p3};
- Arrays.sort(points, new Comparator<TerminalPosition>() {
- @Override
- public int compare(TerminalPosition o1, TerminalPosition o2) {
- return (o1.getRow() < o2.getRow()) ? -1 : ((o1.getRow() == o2.getRow()) ? 0 : 1);
- }
- });
-
- float dx1, dx2, dx3;
- if (points[1].getRow() - points[0].getRow() > 0) {
- dx1 = (float)(points[1].getColumn() - points[0].getColumn()) / (float)(points[1].getRow() - points[0].getRow());
- }
- else {
- dx1 = 0;
- }
- if (points[2].getRow() - points[0].getRow() > 0) {
- dx2 = (float)(points[2].getColumn() - points[0].getColumn()) / (float)(points[2].getRow() - points[0].getRow());
- }
- else {
- dx2 = 0;
- }
- if (points[2].getRow() - points[1].getRow() > 0) {
- dx3 = (float)(points[2].getColumn() - points[1].getColumn()) / (float)(points[2].getRow() - points[1].getRow());
- }
- else {
- dx3 = 0;
- }
-
- float startX, startY, endX;
- startX = endX = points[0].getColumn();
- startY = points[0].getRow();
- if (dx1 > dx2) {
- for (; startY <= points[1].getRow(); startY++, startX += dx2, endX += dx1) {
- drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character);
- }
- endX = points[1].getColumn();
- for (; startY <= points[2].getRow(); startY++, startX += dx2, endX += dx3) {
- drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character);
- }
- } else {
- for (; startY <= points[1].getRow(); startY++, startX += dx1, endX += dx2) {
- drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character);
- }
- startX = points[1].getColumn();
- startY = points[1].getRow();
- for (; startY <= points[2].getRow(); startY++, startX += dx3, endX += dx2) {
- drawLine(new TerminalPosition((int)startX, (int)startY), new TerminalPosition((int)endX, (int)startY), character);
- }
- }
- }
-
- @Override
- public void fillRectangle(TerminalPosition topLeft, TerminalSize size, TextCharacter character) {
- for(int y = 0; y < size.getRows(); y++) {
- for(int x = 0; x < size.getColumns(); x++) {
- callback.onPoint(topLeft.getColumn() + x, topLeft.getRow() + y, character);
- }
- }
- }
-}
git://git.nikiroo.be / jvcard.git / blobdiff