Java tutorial
/* ----------------------------------------------------------------------------- Cogaen - Component-based Game Engine V3 ----------------------------------------------------------------------------- This software is developed by the Cogaen Development Team. Please have a look at our project home page for further details: http://www.cogaen.org - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Copyright (c) 2010-2011 Roman Divotkey Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ package org.cogaen.lwjgl.scene; import org.cogaen.core.Core; import org.cogaen.resource.ResourceService; import org.cogaen.time.TimeService; import org.cogaen.time.Timer; import org.lwjgl.opengl.GL11; import org.newdawn.slick.TrueTypeFont; @SuppressWarnings("deprecation") public class TextBlockVisual extends Visual { private static final double LINE_SPACE = 1.0; private static final double BLINK_TIME = 0.5; private TrueTypeFont ttf; private StringBuffer lines[]; private double width; private double height; private Timer timer; private double timeStamp; private boolean cursorOn; private boolean showCursor = true; private int curX; private int curY; public TextBlockVisual(Core core, String fontRes, double width, double height) { this.ttf = (TrueTypeFont) ResourceService.getInstance(core).getResource(fontRes); this.width = width; this.height = height; this.timer = TimeService.getInstance(core).getTimer(); this.timeStamp = this.timer.getTime() + BLINK_TIME; this.cursorOn = true; int nLines = (int) (this.height / (ttf.getHeight() * LINE_SPACE)); this.lines = new StringBuffer[nLines]; for (int i = 0; i < nLines; ++i) { this.lines[i] = new StringBuffer(); } if (this.lines.length == 0) { throw new RuntimeException("dimension to small for text output"); } this.curX = 0; this.curY = 0; } TextBlockVisual() { // intentionally left empty } @Override public void prolog() { GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glEnable(GL11.GL_BLEND); GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); } @Override public void render() { GL11.glPushMatrix(); GL11.glScaled(getScale(), -getScale(), 1); getColor().apply(); org.newdawn.slick.Color utilColor = new org.newdawn.slick.Color((int) (getColor().getRed() * 255), (int) (getColor().getGreen() * 255), (int) (getColor().getBlue() * 255), (int) (getColor().getAlpha() * 255)); if (this.timeStamp < this.timer.getTime()) { this.timeStamp = this.timer.getTime() + BLINK_TIME; this.cursorOn = !this.cursorOn; } for (int i = 0; i < this.lines.length; ++i) { this.ttf.drawString((float) (-this.width / 2), (float) (-this.height / 2 + i * ttf.getHeight() * LINE_SPACE), this.lines[i].toString(), utilColor); } if (this.cursorOn && this.showCursor) { GL11.glDisable(GL11.GL_TEXTURE_2D); GL11.glEnable(GL11.GL_BLEND); double offsetX; if (this.curX == 0) { offsetX = 0; } else if (this.curX >= this.lines[this.curY].length()) { offsetX = this.ttf.getWidth(this.lines[this.curY].substring(0, this.lines[this.curY].length())); } else { offsetX = this.ttf.getWidth(this.lines[this.curY].substring(0, this.curX)); } double offsetY = this.curY * this.ttf.getHeight() * LINE_SPACE; double x = -this.width / 2 + offsetX; double y = -this.height / 2 + offsetY + this.ttf.getHeight() / 2; double curHeight = this.ttf.getHeight() / 2 * 0.8; GL11.glBegin(GL11.GL_LINES); GL11.glVertex2d(x, y + curHeight); GL11.glVertex2d(x, y - curHeight); GL11.glEnd(); } GL11.glPopMatrix(); } @Override public void epilog() { // intentionally left empty } @Override public TextBlockVisual newInstance() { TextBlockVisual instance = new TextBlockVisual(); super.copyFields(instance); instance.ttf = ttf; instance.width = this.width; instance.height = this.height; instance.timer = this.timer; instance.timeStamp = this.timeStamp; instance.showCursor = this.showCursor; for (int i = 0; i < this.lines.length; ++i) { instance.lines[i] = new StringBuffer(this.lines[i]); } return instance; } public void addChar(char ch) { if (this.lines[this.curY].length() <= this.curX) { this.lines[this.curY].append(ch); } else { this.lines[this.curY].insert(this.curX, ch); } this.curX++; if (!adjust(this.curY)) { this.lines[this.curY].deleteCharAt(this.curX - 1); this.curX--; } } public void addString(String str) { for (int i = 0; i < str.length(); ++i) { addChar(str.charAt(i)); } } private boolean adjust(int idx) { if (this.ttf.getWidth(this.lines[idx].toString()) > this.width) { if (idx + 1 >= this.lines.length) { return false; } int i = this.lines[idx].length() - 1; while (i > 0 && this.lines[idx].charAt(i) != ' ') { --i; } if (i == 0) { return false; } String word = this.lines[idx].substring(i + 1, this.lines[idx].length()); this.lines[idx].delete(i, this.lines[idx].length()); this.lines[idx + 1].insert(0, word); boolean needSpace = this.lines[idx + 1].length() > word.length(); if (needSpace) { this.lines[idx + 1].insert(word.length(), ' '); } int oldCurX = -1; if (idx == this.curY && this.curX > this.lines[idx].length()) { this.curY++; oldCurX = this.curX; this.curX = word.length(); } if (!adjust(idx + 1)) { this.lines[idx].append(word); this.lines[idx + 1].delete(0, word.length()); if (needSpace) { this.lines[idx + 1].delete(0, 1); } if (oldCurX != -1) { this.curY--; this.curX = oldCurX; } return false; } return adjust(idx); } return true; } public void back() { if (this.curX - 1 >= 0) { this.lines[this.curY].deleteCharAt(this.curX - 1); this.curX--; for (int i = this.curY + 1; i < this.lines.length; ++i) { if (this.lines[i].length() > 0) { this.lines[this.curY].append(' '); this.lines[this.curY].append(this.lines[i]); this.lines[i].setLength(0); } } adjust(this.curY); } else if (this.curY > 0) { this.lines[this.curY - 1].deleteCharAt(this.lines[this.curY - 1].length() - 1); this.curY--; this.curX = this.lines[this.curY].length(); for (int i = this.curY + 1; i < this.lines.length; ++i) { this.lines[this.curY].append(this.lines[i]); this.lines[i].setLength(0); } adjust(this.curY); } } public void left() { if (this.curX > 0) { this.curX--; } else if (this.curY > 0) { this.curY--; this.curX = this.lines[this.curY].length(); } } public void right() { if (this.curX < this.lines[this.curY].length()) { this.curX++; } else if (this.curY < this.lines.length - 1 && this.lines[this.curY + 1].length() > 0) { this.curY++; this.curX = 0; } } public void up() { if (this.curY > 0) { this.curY--; } } public void down() { if (this.curY < this.lines.length - 1 && this.lines[this.curY + 1].length() != 0) { this.curY++; if (this.curX > this.lines[this.curY].length()) { this.curX = this.lines[this.curY].length(); } } } public double getWidth() { return this.width; } public void setWidth(double width) { this.width = width; } public double getHeight() { return this.height; } public void setHeight(double height) { this.height = height; } public void setTimer(Timer timer) { this.timer = timer; } public Timer getTimer() { return this.timer; } public String getText() { StringBuffer buf = new StringBuffer(); for (int i = 0; i < lines.length; ++i) { if (lines[i].length() > 0) { buf.append(' '); buf.append(lines[i]); } } return buf.toString().trim(); } public void setText(String text) { for (int i = 0; i < this.lines.length; ++i) { this.lines[i].setLength(0); } this.curX = 0; this.curY = 0; addString(text); } public boolean isShowCursor() { return showCursor; } public void setShowCursor(boolean showCursor) { this.showCursor = showCursor; } }