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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
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* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
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* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
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*/
/*
* @ test MirrorTest
* @ bug 8255387
* @ summary Mirrored characters should be drawn correctly
* @ run main MirrorTest
*/
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
public class MirrorTest {
static String target = "\u3042" ;
static final int SIZE = 50 ;
static final int SHIFT = 20 ;
static final int LIMIT = 5 ;
static Point getCenterOfGravity(BufferedImage img) {
int count = 0 ;
int sx = 0 ;
int sy = 0 ;
for (int y = 0 ; y < SIZE; y++) {
for (int x = 0 ; x < SIZE; x++) {
int c = img.getRGB(x, y) & 0 xFFFFFF;
if (c == 0 ) {
count++;
sx += x;
sy += y;
}
}
}
if (count == 0 ) {
return null ;
} else {
return new Point(sx/count, sy/count);
}
}
static BufferedImage drawNormal(Font font) {
BufferedImage image = new BufferedImage(SIZE, SIZE,
BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2d = image.createGraphics();
g2d.setColor(Color.white);
g2d.fillRect(0 , 0 , image.getWidth(), image.getHeight());
g2d.setColor(Color.black);
//Set antialias on not to use embedded bitmap for reference
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
g2d.drawString(target, SHIFT, SHIFT+fm.getAscent());
g2d.dispose();
return image;
}
static BufferedImage drawVerticalMirror(Font font) {
BufferedImage image = new BufferedImage(SIZE, SIZE,
BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2d = image.createGraphics();
g2d.setColor(Color.white);
g2d.fillRect(0 , 0 , image.getWidth(), image.getHeight());
g2d.setColor(Color.black);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
AffineTransform base = g2d.getTransform();
AffineTransform trans = new AffineTransform(1 .0 , 0 , 0 , -1 .0 , 0 , 0 );
trans.concatenate(base);
g2d.setTransform(trans);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
g2d.drawString(target, SHIFT, SHIFT-image.getHeight()+fm.getAscent());
g2d.dispose();
return image;
}
static BufferedImage drawHorizontalMirror(Font font) {
BufferedImage image = new BufferedImage(SIZE, SIZE,
BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2d = image.createGraphics();
g2d.setColor(Color.white);
g2d.fillRect(0 , 0 , image.getWidth(), image.getHeight());
g2d.setColor(Color.black);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
AffineTransform base = g2d.getTransform();
AffineTransform trans = new AffineTransform(-1 .0 , 0 , 0 , 1 .0 , 0 , 0 );
trans.concatenate(base);
g2d.setTransform(trans);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
g2d.drawString(target, SHIFT-image.getWidth(), SHIFT+fm.getAscent());
g2d.dispose();
return image;
}
public static void main(String[] args) {
GraphicsEnvironment ge =
GraphicsEnvironment.getLocalGraphicsEnvironment();
Font fonts[] = ge.getAllFonts();
for (Font font: fonts) {
if (!font.canDisplay(target.charAt(0 ))) {
continue ;
}
font = font.deriveFont(12 .0 f);
BufferedImage img1 = drawNormal(font);
BufferedImage img2 = drawVerticalMirror(font);
BufferedImage img3 = drawHorizontalMirror(font);
Point p1 = getCenterOfGravity(img1);
Point p2 = getCenterOfGravity(img2);
Point p3 = getCenterOfGravity(img3);
if (p1 == null || p2 == null || p3 == null ) {
continue ;
}
p2.y = SIZE - p2.y - 2 ; // Back from vertical mirror
p3.x = SIZE - p3.x - 2 ; // Back from horizontal mirror
if (Math.abs(p1.x - p2.x) > LIMIT ||
Math.abs(p1.y - p2.y) > LIMIT ||
Math.abs(p1.x - p3.x) > LIMIT ||
Math.abs(p1.y - p3.y) > LIMIT) {
System.out.println("Error: " +p1+"," +p2+"," +p3);
throw new RuntimeException(
"Incorrect mirrored character with " + font);
}
}
}
}
Messung V0.5 in Prozent C=97 H=91 G=93
¤ Dauer der Verarbeitung: 0.9 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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