Apidemo学习 TextAlign Typefaces 切换字体 UnicodeChart
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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);//绘制波浪线 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);//把text中每个文字的宽度复制到widths数组中, n是text中的字数 // now populate the array, interleaving spaces for the Y values float[] pos = new float[n * 2];//填充x y的位置 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 绘制普通的文字 p.setColor(0x80FF0000); canvas.drawLine(x, y, x, y+DY*3, p); p.setColor(Color.BLACK); canvas.translate(0, DY);//三种对齐方式 以x左对齐 p.setTextAlign(Paint.Align.LEFT); canvas.drawText(TEXT_L, x, y, p); canvas.translate(0, DY);//下移 p.setTextAlign(Paint.Align.CENTER);//以x中间对齐 canvas.drawText(TEXT_C, x, y, p); canvas.translate(0, DY);//右对齐 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++) { //绘制一个网格 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);//可以通过位置数组来一个一个位置绘制文字,在参考点左边 canvas.translate(0, DY); p.setTextAlign(Paint.Align.CENTER);//中间 canvas.drawPosText(POSTEXT, pos, p); canvas.translate(0, DY); p.setTextAlign(Paint.Align.RIGHT); //右边 canvas.drawPosText(POSTEXT, pos, p); // now draw the text on path 可以根据路径来绘制文字 canvas.translate(-100, DY*2); canvas.drawPath(mPath, mPathPaint); p.setTextAlign(Paint.Align.LEFT);//在路径的左边 canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p); canvas.translate(0, DY*1.5f); canvas.drawPath(mPath, mPathPaint); p.setTextAlign(Paint.Align.CENTER);//在路径的中间 canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p); canvas.translate(0, DY*1.5f); canvas.drawPath(mPath, mPathPaint); p.setTextAlign(Paint.Align.RIGHT);//在路径的右边 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 //居中显示 } }}/* *android 其实也可以自定义字体 通过paint就可以 */public class Typefaces extends GraphicsActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new SampleView(this)); } private static class SampleView extends View { private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); private Typeface mFace; public SampleView(Context context) { super(context); mFace = Typeface.createFromAsset(getContext().getAssets(), "fonts/samplefont.ttf"); //也可以从sd卡等地方拿到字体显示 mPaint.setTextSize(64); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); mPaint.setTypeface(null); canvas.drawText("Default", 10, 100, mPaint); mPaint.setTypeface(mFace); canvas.drawText("Custom", 10, 200, mPaint); } }}//打印Unicode编码可以进行,左右按钮 变化mbase 来调整其他unicode值public class UnicodeChart extends GraphicsActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(new SampleView(this)); } private static class SampleView extends View { private Paint mBigCharPaint; private Paint mLabelPaint; private final char[] mChars = new char[256]; private final float[] mPos = new float[512]; private int mBase; private static final int XMUL = 20; private static final int YMUL = 28; private static final int YBASE = 18; public SampleView(Context context) { super(context); setFocusable(true); setFocusableInTouchMode(true); mBigCharPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mBigCharPaint.setTextSize(15); mBigCharPaint.setTextAlign(Paint.Align.CENTER); mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mLabelPaint.setTextSize(8); mLabelPaint.setTextAlign(Paint.Align.CENTER); // the position array is the same for all charts float[] pos = mPos; int index = 0; for (int col = 0; col < 16; col++) { final float x = col * XMUL + 10; for (int row = 0; row < 16; row++) { pos[index++] = x; pos[index++] = row * YMUL + YBASE; } } } private float computeX(int index) { return (index >> 4) * XMUL + 10; } private float computeY(int index) { return (index & 0xF) * YMUL + YMUL; } private void drawChart(Canvas canvas, int base) { char[] chars = mChars; for (int i = 0; i < 256; i++) { int unichar = base + i; chars[i] = (char)unichar;//把每个整型值转为 char并输出 canvas.drawText(Integer.toHexString(unichar), computeX(i), computeY(i), mLabelPaint); } canvas.drawPosText(chars, 0, 256, mPos, mBigCharPaint); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); canvas.translate(0, 1); drawChart(canvas, mBase * 256); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_DPAD_LEFT: if (mBase > 0) { mBase -= 1; invalidate(); } return true; case KeyEvent.KEYCODE_DPAD_RIGHT: mBase += 1; invalidate(); return true; default: break; } return super.onKeyDown(keyCode, event); } }} 0 0
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