1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
@test
@bug 8165943
@summary LineBreakMeasurer does not measure correctly if TextAttribute.TRACKING is set
@run main/othervm LineBreakWithTrackingAuto
*/
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedString;
public class LineBreakWithTrackingAuto {
private static final String WORD = "word";
private static final String SPACE = " ";
private static final int NUM_WORDS = 12;
private static final float FONT_SIZE = 24.0f;
private static final float TEXT_TRACKING[] = { -0.1f, 0f, 0.1f, 0.2f, 0.3f };
private static final float EPSILON = 0.005f;
public static void main(String[] args) {
new LineBreakWithTrackingAuto().test();
}
public void test() {
final FontRenderContext frc = new FontRenderContext(null, false, false);
// construct a paragraph as follows: [SPACE + WORD] + ...
StringBuffer text = new StringBuffer();
for (int i = 0; i < NUM_WORDS; i++) {
text.append(SPACE);
text.append(WORD);
}
AttributedString attrString = new AttributedString(text.toString());
attrString.addAttribute(TextAttribute.SIZE, Float.valueOf(FONT_SIZE));
// test different tracking values: -0.1f, 0f, 0.1f, 0.2f, 0.3f
for (float textTracking : TEXT_TRACKING) {
final float trackingAdvance = FONT_SIZE * textTracking;
attrString.addAttribute(TextAttribute.TRACKING, textTracking);
LineBreakMeasurer measurer = new LineBreakMeasurer(attrString.getIterator(), frc);
final int sequenceLength = WORD.length() + SPACE.length();
final float sequenceAdvance = getSequenceAdvance(measurer, text.length(), sequenceLength);
final float textAdvance = NUM_WORDS * sequenceAdvance;
// test different wrapping width starting from the WORD+SPACE to TEXT width
for (float wrappingWidth = sequenceAdvance; wrappingWidth < textAdvance; wrappingWidth += sequenceAdvance / sequenceLength) {
measurer.setPosition(0);
// break a paragraph into lines that fit the given wrapping width
do {
TextLayout layout = measurer.nextLayout(wrappingWidth);
float visAdvance = layout.getVisibleAdvance();
int currPos = measurer.getPosition();
if ((trackingAdvance <= 0 && visAdvance - wrappingWidth > EPSILON)
|| (trackingAdvance > 0 && visAdvance - wrappingWidth > trackingAdvance + EPSILON)) {
throw new Error("text line is too long for given wrapping width");
}
if (currPos < text.length() && visAdvance <= wrappingWidth - sequenceAdvance) {
throw new Error("text line is too short for given wrapping width");
}
} while (measurer.getPosition() != text.length());
}
}
}
private float getSequenceAdvance(LineBreakMeasurer measurer, int textLength, int sequenceLength) {
measurer.setPosition(textLength - sequenceLength);
TextLayout layout = measurer.nextLayout(10000.0f);
if (layout.getCharacterCount() != sequenceLength) {
throw new Error("layout length is incorrect");
}
return layout.getVisibleAdvance();
}
}
|
