我正在使用Slick2d让一些简单的文本在监视器周围飞行。 为此，我使用Slick2D的TrueTypeFont类和java.awt的Fontclass。 我正在尝试使用字符串中的常用\ n来创建换行符。但这不会奏效。有没有人想出办法来做到这一点：
例如：
awtFont = new Font("Times New Roman", Font.BOLD, 20);
font = new TrueTypeFont(awtFont, true);
Color.white.bind();
font.drawString(position.getX(),position.getY(),"Heyho, i want a \n chocolatecake",Color.black);
答案 0 :(得分：1)
我认为wordwrapping是在Slick2D的基本真实字体类中实现的。您使用的是最新的Slick2D版本吗？如果您这样做并且它不起作用，则表示您必须绘制第二个字符串或进行修改 Slick2D的真实字体类。
package org.newdawn.slick;
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.newdawn.slick.opengl.GLUtils;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.renderer.Renderer;
import org.newdawn.slick.opengl.renderer.SGL;
import org.newdawn.slick.util.BufferedImageUtil;
/**
* A TrueType font implementation for Slick
*
* @author James Chambers (Jimmy)
* @author Jeremy Adams (elias4444)
* @author Kevin Glass (kevglass)
* @author Peter Korzuszek (genail)
* @author David Muhar (bobjob)
*/
public class TrueTypeFont implements org.newdawn.slick.Font {
public final static int
ALIGN_LEFT = 0,
ALIGN_RIGHT = 1,
ALIGN_CENTER = 2;
/** The renderer to use for all GL operations */
private static final SGL GL = Renderer.get();
/** Array that holds necessary information about the font characters */
private IntObject[] charArray = new IntObject[256];
/** Map of user defined font characters (Character <-> IntObject) */
private Map customChars = new HashMap();
/** Boolean flag on whether AntiAliasing is enabled or not */
private boolean antiAlias;
/** Font's size */
private int fontSize = 0;
/** Font's height */
private int fontHeight = 0;
/** Texture used to cache the font 0-255 characters */
private Texture fontTexture;
/** Default font texture width */
private int textureWidth = 512;
/** Default font texture height */
private int textureHeight = 512;
/** A reference to Java's AWT Font that we create our font texture from */
private java.awt.Font font;
/** The font metrics for our Java AWT font */
private FontMetrics fontMetrics;
/**
* This is a special internal class that holds our necessary information for
* the font characters. This includes width, height, and where the character
* is stored on the font texture.
*/
private class IntObject {
/** Character's width */
public int width;
/** Character's height */
public int height;
/** Character's stored x position */
public int storedX;
/** Character's stored y position */
public int storedY;
}
/**
* Constructor for the TrueTypeFont class Pass in the preloaded standard
* Java TrueType font, and whether you want it to be cached with
* AntiAliasing applied.
*
* @param font
* Standard Java AWT font
* @param antiAlias
* Whether or not to apply AntiAliasing to the cached font
* @param additionalChars
* Characters of font that will be used in addition of first 256 (by unicode).
*/
public TrueTypeFont(java.awt.Font font, boolean antiAlias, char[] additionalChars) {
GLUtils.checkGLContext();
this.font = font;
this.fontSize = font.getSize();
this.antiAlias = antiAlias;
createSet( additionalChars );
}
/**
* Constructor for the TrueTypeFont class Pass in the preloaded standard
* Java TrueType font, and whether you want it to be cached with
* AntiAliasing applied.
*
* @param font
* Standard Java AWT font
* @param antiAlias
* Whether or not to apply AntiAliasing to the cached font
*/
public TrueTypeFont(java.awt.Font font, boolean antiAlias) {
this( font, antiAlias, null );
}
/**
* Create a standard Java2D BufferedImage of the given character
*
* @param ch
* The character to create a BufferedImage for
*
* @return A BufferedImage containing the character
*/
private BufferedImage getFontImage(char ch) {
// Create a temporary image to extract the character's size
BufferedImage tempfontImage = new BufferedImage(1, 1,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) tempfontImage.getGraphics();
if (antiAlias == true) {
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
g.setFont(font);
fontMetrics = g.getFontMetrics();
int charwidth = fontMetrics.charWidth(ch);
if (charwidth <= 0) {
charwidth = 1;
}
int charheight = fontMetrics.getHeight();
if (charheight <= 0) {
charheight = fontSize;
}
// Create another image holding the character we are creating
BufferedImage fontImage;
fontImage = new BufferedImage(charwidth, charheight,
BufferedImage.TYPE_INT_ARGB);
Graphics2D gt = (Graphics2D) fontImage.getGraphics();
if (antiAlias == true) {
gt.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
}
gt.setFont(font);
gt.setColor(Color.WHITE);
int charx = 0;
int chary = 0;
gt.drawString(String.valueOf(ch), (charx), (chary)
+ fontMetrics.getAscent());
return fontImage;
}
/**
* Create and store the font
*
* @param customCharsArray Characters that should be also added to the cache.
*/
private void createSet( char[] customCharsArray ) {
// If there are custom chars then I expand the font texture twice
if (customCharsArray != null && customCharsArray.length > 0) {
textureWidth *= 2;
}
// In any case this should be done in other way. Texture with size 512x512
// can maintain only 256 characters with resolution of 32x32. The texture
// size should be calculated dynamicaly by looking at character sizes.
try {
BufferedImage imgTemp = new BufferedImage(textureWidth, textureHeight, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) imgTemp.getGraphics();
g.setColor(new Color(255,255,255,1));
g.fillRect(0,0,textureWidth,textureHeight);
int rowHeight = 0;
int positionX = 0;
int positionY = 0;
int customCharsLength = ( customCharsArray != null ) ? customCharsArray.length : 0;
for (int i = 0; i < 256 + customCharsLength; i++) {
// get 0-255 characters and then custom characters
char ch = ( i < 256 ) ? (char) i : customCharsArray[i-256];
BufferedImage fontImage = getFontImage(ch);
IntObject newIntObject = new IntObject();
newIntObject.width = fontImage.getWidth();
newIntObject.height = fontImage.getHeight();
if (positionX + newIntObject.width >= textureWidth) {
positionX = 0;
positionY += rowHeight;
rowHeight = 0;
}
newIntObject.storedX = positionX;
newIntObject.storedY = positionY;
if (newIntObject.height > fontHeight) {
fontHeight = newIntObject.height;
}
if (newIntObject.height > rowHeight) {
rowHeight = newIntObject.height;
}
// Draw it here
g.drawImage(fontImage, positionX, positionY, null);
positionX += newIntObject.width;
if( i < 256 ) { // standard characters
charArray[i] = newIntObject;
} else { // custom characters
customChars.put( new Character( ch ), newIntObject );
}
fontImage = null;
}
fontTexture = BufferedImageUtil
.getTexture(font.toString(), imgTemp);
} catch (IOException e) {
System.err.println("Failed to create font.");
e.printStackTrace();
}
}
/**
* Draw a textured quad
*
* @param drawX
* The left x position to draw to
* @param drawY
* The top y position to draw to
* @param drawX2
* The right x position to draw to
* @param drawY2
* The bottom y position to draw to
* @param srcX
* The left source x position to draw from
* @param srcY
* The top source y position to draw from
* @param srcX2
* The right source x position to draw from
* @param srcY2
* The bottom source y position to draw from
*/
private void drawQuad(float drawX, float drawY, float drawX2, float drawY2,
float srcX, float srcY, float srcX2, float srcY2) {
float DrawWidth = drawX2 - drawX;
float DrawHeight = drawY2 - drawY;
float TextureSrcX = srcX / textureWidth;
float TextureSrcY = srcY / textureHeight;
float SrcWidth = srcX2 - srcX;
float SrcHeight = srcY2 - srcY;
float RenderWidth = (SrcWidth / textureWidth);
float RenderHeight = (SrcHeight / textureHeight);
GL.glTexCoord2f(TextureSrcX, TextureSrcY);
GL.glVertex2f(drawX, drawY);
GL.glTexCoord2f(TextureSrcX, TextureSrcY + RenderHeight);
GL.glVertex2f(drawX, drawY + DrawHeight);
GL.glTexCoord2f(TextureSrcX + RenderWidth, TextureSrcY + RenderHeight);
GL.glVertex2f(drawX + DrawWidth, drawY + DrawHeight);
GL.glTexCoord2f(TextureSrcX + RenderWidth, TextureSrcY);
GL.glVertex2f(drawX + DrawWidth, drawY);
}
/**
* Get the width of a given String
*
* @param whatchars
* The characters to get the width of
*
* @return The width of the characters
*/
public int getWidth(String whatchars) {
int totalwidth = 0;
IntObject intObject = null;
int currentChar = 0;
for (int i = 0; i < whatchars.length(); i++) {
currentChar = whatchars.charAt(i);
if (currentChar < 256) {
intObject = charArray[currentChar];
} else {
intObject = (IntObject)customChars.get( new Character( (char) currentChar ) );
}
if( intObject != null )
totalwidth += intObject.width;
}
return totalwidth;
}
/**
* Get the font's height
*
* @return The height of the font
*/
public int getHeight() {
return fontHeight;
}
/**
* Get the height of a String
*
* @return The height of a given string
*/
public int getHeight(String HeightString) {
return fontHeight;
}
/**
* Get the font's line height
*
* @return The line height of the font
*/
public int getLineHeight() {
return fontHeight;
}
/**
* Draw a string
*
* @param x
* The x position to draw the string
* @param y
* The y position to draw the string
* @param whatchars
* The string to draw
* @param color
* The color to draw the text
*/
public void drawString(float x, float y, String whatchars,
org.newdawn.slick.Color color) {
GL.glPushMatrix();
GL.glTranslatef(x, y, 0);
drawString(whatchars,color,0,whatchars.length()-1, ALIGN_LEFT);
GL.glPopMatrix();
}
/**
*/
public void drawString(float x, float y, String whatchars,
org.newdawn.slick.Color color, int align) {
GL.glPushMatrix();
GL.glTranslatef(x, y, 0);
drawString(whatchars,color,0,whatchars.length()-1, align);
GL.glPopMatrix();
}
/**
* @see Font#drawString(float, float, String, org.newdawn.slick.Color, int, int)
*/
public void drawString(float x, float y, String whatchars,
org.newdawn.slick.Color color, int startIndex, int endIndex) {
GL.glPushMatrix();
GL.glTranslatef(x, y, 0);
drawString(whatchars, color, startIndex, endIndex, ALIGN_LEFT);
GL.glPopMatrix();
}
/**
*/
public void drawString(float x, float y, String whatchars,
org.newdawn.slick.Color color, int startIndex, int endIndex, int align) {
GL.glPushMatrix();
GL.glTranslatef(x, y, 0);
drawString(whatchars, color, startIndex, endIndex, align);
GL.glPopMatrix();
}
/**
*/
public void drawString(String whatchars,
org.newdawn.slick.Color color, int startIndex, int endIndex, int align) {
color.bind();
fontTexture.bind();
IntObject intObject = null;
int charCurrent, totalwidth = 0, i = startIndex, d;
float startY = 0;
GL.glBegin(SGL.GL_QUADS);
switch (align) {
case ALIGN_RIGHT: {
d = -1;
while (i < endIndex) {
if (whatchars.charAt(i) == '\n') startY += fontHeight;
i++;
}
break;
}
case ALIGN_CENTER: {
for (int l = startIndex; l <= endIndex; l++) {
charCurrent = whatchars.charAt(l);
if (charCurrent == '\n') break;
if (charCurrent < 256) {
intObject = charArray[charCurrent];
} else {
intObject = (IntObject)customChars.get( new Character( (char) charCurrent ) );
}
totalwidth += intObject.width;
}
totalwidth /= -2;
}
case ALIGN_LEFT:
default: {
d = 1;
break;
}
}
//int totalwidth = 0;
//for (int i = 0; i < whatchars.length(); i++) {
while (i >= startIndex && i <= endIndex) {
charCurrent = whatchars.charAt(i);
if (charCurrent < 256) {
intObject = charArray[charCurrent];
} else {
intObject = (IntObject)customChars.get( new Character( (char) charCurrent ) );
}
if( intObject != null ) {
if (d < 0) totalwidth += intObject.width * d;
if (charCurrent == '\n') {
startY += fontHeight * d;
totalwidth = 0;
if (align == ALIGN_CENTER) {
for (int l = i+1; l <= endIndex; l++) {
charCurrent = whatchars.charAt(l);
if (charCurrent == '\n') break;
if (charCurrent < 256) {
intObject = charArray[charCurrent];
} else {
intObject = (IntObject)customChars.get( new Character( (char) charCurrent ) );
}
totalwidth += intObject.width;
}
totalwidth /= -2;
}
//if center get next lines total width/2;
}
else {
drawQuad(totalwidth, startY,
totalwidth + intObject.width,
startY + intObject.height, intObject.storedX,
intObject.storedY, intObject.storedX + intObject.width,
intObject.storedY + intObject.height);
if (d > 0) totalwidth += intObject.width * d ;
}
i += d;
}
}
GL.glEnd();
}
/**
* Draw a string
*
* @param x
* The x position to draw the string
* @param y
* The y position to draw the string
* @param whatchars
* The string to draw
*/
public void drawString(float x, float y, String whatchars) {
drawString(x, y, whatchars, org.newdawn.slick.Color.white);
}
}
此实现允许您使用\ n字符，并允许您使用对齐。如上所述，我认为这应该在Slick2D的最新版本中实现，以防您使用较旧版本，无论出于何种原因您应该修改真实类型字体类，它将允许您使用\ n字符。