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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.graphics;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.*;
public class TextAlign extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint mPaint;
private float mX;
private float[] mPos;
private Path mPath;
private Paint mPathPaint;
private static final int DY = 30;
private static final String TEXT_L = "Left";
private static final String TEXT_C = "Center";
private static final String TEXT_R = "Right";
private static final String POSTEXT = "Positioned";
private static final String TEXTONPATH = "Along a path";
private static void makePath(Path p) {
p.moveTo(10, 0);
p.cubicTo(100, -50, 200, 50, 300, 0);
}
private float[] buildTextPositions(String text, float y, Paint paint) {
float[] widths = new float[text.length()];
// initially get the widths for each char
int n = paint.getTextWidths(text, widths);
// now popuplate the array, interleaving spaces for the Y values
float[] pos = new float[n * 2];
float accumulatedX = 0;
for (int i = 0; i < n; i++) {
pos[i*2 + 0] = accumulatedX;
pos[i*2 + 1] = y;
accumulatedX += widths[i];
}
return pos;
}
public SampleView(Context context) {
super(context);
setFocusable(true);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setTextSize(30);
mPaint.setTypeface(Typeface.SERIF);
mPos = buildTextPositions(POSTEXT, 0, mPaint);
mPath = new Path();
makePath(mPath);
mPathPaint = new Paint();
mPathPaint.setAntiAlias(true);
mPathPaint.setColor(0x800000FF);
mPathPaint.setStyle(Paint.Style.STROKE);
}
@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
Paint p = mPaint;
float x = mX;
float y = 0;
float[] pos = mPos;
// draw the normal strings
p.setColor(0x80FF0000);
canvas.drawLine(x, y, x, y+DY*3, p);
p.setColor(Color.BLACK);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawText(TEXT_L, x, y, p);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.CENTER);
canvas.drawText(TEXT_C, x, y, p);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.RIGHT);
canvas.drawText(TEXT_R, x, y, p);
canvas.translate(100, DY*2);
// now draw the positioned strings
p.setColor(0xBB00FF00);
for (int i = 0; i < pos.length/2; i++) {
canvas.drawLine(pos[i*2+0], pos[i*2+1]-DY,
pos[i*2+0], pos[i*2+1]+DY*2, p);
}
p.setColor(Color.BLACK);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawPosText(POSTEXT, pos, p);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.CENTER);
canvas.drawPosText(POSTEXT, pos, p);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.RIGHT);
canvas.drawPosText(POSTEXT, pos, p);
// now draw the text on path
canvas.translate(-100, DY*2);
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
canvas.translate(0, DY*1.5f);
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.CENTER);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
canvas.translate(0, DY*1.5f);
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.RIGHT);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
}
@Override
protected void onSizeChanged(int w, int h, int ow, int oh) {
super.onSizeChanged(w, h, ow, oh);
mX = w * 0.5f; // remember the center of the screen
}
}
}
|
