很简单 但是参考价值非常大
public class Arcs extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint[] mPaints;
private Paint mFramePaint;
private boolean[] mUseCenters;
private RectF[] mOvals;
private RectF mBigOval;
private float mStart;
private float mSweep;
private int mBigIndex;
private static final float SWEEP_INC = 2;
private static final float START_INC = 15;
public SampleView(Context context) {
super(context);
mPaints = new Paint[4];
mUseCenters = new boolean[4];
mOvals = new RectF[4];
//不使用中心填充的饼
mPaints[0] = new Paint();
mPaints[0].setAntiAlias(true);
mPaints[0].setStyle(Paint.Style.FILL);
mPaints[0].setColor(0x88FF0000);
mUseCenters[0] = false;
//使用中心填充的饼
mPaints[1] = new Paint(mPaints[0]);
mPaints[1].setColor(0x8800FF00);
mUseCenters[1] = true;
//只画边框
mPaints[2] = new Paint(mPaints[0]);
mPaints[2].setStyle(Paint.Style.STROKE);
mPaints[2].setStrokeWidth(4);
mPaints[2].setColor(0x880000FF);
mUseCenters[2] = false;
//边框 + 中心 就是扇形
mPaints[3] = new Paint(mPaints[2]);
mPaints[3].setColor(0x88888888);
mUseCenters[3] = true;
mBigOval = new RectF(40, 10, 280, 250); //最大的圆
mOvals[0] = new RectF( 10, 270, 70, 330); //每个图案的位置
mOvals[1] = new RectF( 90, 270, 150, 330);
mOvals[2] = new RectF(170, 270, 230, 330);
mOvals[3] = new RectF(250, 270, 310, 330);
//方形边框颜色
mFramePaint = new Paint();
mFramePaint.setAntiAlias(true);
mFramePaint.setStyle(Paint.Style.STROKE);
mFramePaint.setStrokeWidth(0);
}
private void drawArcs(Canvas canvas, RectF oval, boolean useCenter,
Paint paint) {
canvas.drawRect(oval, mFramePaint);
canvas.drawArc(oval, mStart, mSweep, useCenter, paint);
}
@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);//背景是白色
drawArcs(canvas, mBigOval, mUseCenters[mBigIndex],
mPaints[mBigIndex]); //最大的圆圈
for (int i = 0; i < 4; i++) { //四个小的圆圈
drawArcs(canvas, mOvals[i], mUseCenters[i], mPaints[i]);
}
mSweep += SWEEP_INC;
if (mSweep > 360) {//不断增加角度并刷新
mSweep -= 360;
mStart += START_INC;
if (mStart >= 360) {
mStart -= 360;
}
mBigIndex = (mBigIndex + 1) % mOvals.length; //改变大圆绘画的图案
}
invalidate();
}
}
}public class BitmapDecode extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Bitmap mBitmap;
private Bitmap mBitmap2;
private Bitmap mBitmap3;
private Bitmap mBitmap4;
private Drawable mDrawable;
private Movie mMovie;
private long mMovieStart;
//Set to false to use decodeByteArray
private static final boolean DECODE_STREAM = true;
private static byte[] streamToBytes(InputStream is) {
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
byte[] buffer = new byte[1024];
int len;
try {
while ((len = is.read(buffer)) >= 0) {
os.write(buffer, 0, len);
}
} catch (java.io.IOException e) {
}
return os.toByteArray();
}
public SampleView(Context context) {
super(context);
setFocusable(true);
java.io.InputStream is;
is = context.getResources().openRawResource(R.drawable.beach);
BitmapFactory.Options opts = new BitmapFactory.Options();
Bitmap bm;
opts.inJustDecodeBounds = true;
bm = BitmapFactory.decodeStream(is, null, opts);
// now opts.outWidth and opts.outHeight are the dimension of the
// bitmap, even though bm is null
opts.inJustDecodeBounds = false; // this will request the bm
opts.inSampleSize = 4; // scaled down by 4
bm = BitmapFactory.decodeStream(is, null, opts);
mBitmap = bm;
// decode an image with transparency
is = context.getResources().openRawResource(R.drawable.frog);
mBitmap2 = BitmapFactory.decodeStream(is);
// create a deep copy of it using getPixels() into different configs
//对这个bitmap拷贝到bitmap3 和bitmap4上 ,拷贝的质量 不是很一样
int w = mBitmap2.getWidth();
int h = mBitmap2.getHeight();
int[] pixels = new int[w*h];
mBitmap2.getPixels(pixels, 0, w, 0, 0, w, h);
mBitmap3 = Bitmap.createBitmap(pixels, 0, w, w, h,
Bitmap.Config.ARGB_8888);
mBitmap4 = Bitmap.createBitmap(pixels, 0, w, w, h,
Bitmap.Config.RGB_565);
mDrawable = context.getResources().getDrawable(R.drawable.button);
mDrawable.setBounds(200, 20, 300, 100);//设置 bounds 这样drawable 在画的时候才会显示出来
is = context.getResources().openRawResource(R.drawable.animated_gif);
if (DECODE_STREAM) {
mMovie = Movie.decodeStream(is);
} else {
byte[] array = streamToBytes(is);
mMovie = Movie.decodeByteArray(array, 0, array.length);
}
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC);
Paint p = new Paint();
p.setAntiAlias(true);
canvas.drawBitmap(mBitmap, 10, 10, null);
canvas.drawBitmap(mBitmap2, 10, 170, null);
canvas.drawBitmap(mBitmap3, 110, 170, null);
canvas.drawBitmap(mBitmap4, 210, 170, null);
mDrawable.draw(canvas);//drawable可以这样画到canvas上
long now = android.os.SystemClock.uptimeMillis();
if (mMovieStart == 0) { // first time
mMovieStart = now;
}
if (mMovie != null) {
int dur = mMovie.duration();
if (dur == 0) {
dur = 1000;
}
int relTime = (int)((now - mMovieStart) % dur);
mMovie.setTime(relTime); //这是一种播放 gif的方式
mMovie.draw(canvas, getWidth() - mMovie.width(),
getHeight() - mMovie.height());
invalidate();
}
}
}
}public class BitmapMesh extends GraphicsActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private static final int WIDTH = 20;
private static final int HEIGHT = 20;
private static final int COUNT = (WIDTH + 1) * (HEIGHT + 1);
private final Bitmap mBitmap;
private final float[] mVerts = new float[COUNT*2];
private final float[] mOrig = new float[COUNT*2];
private final Matrix mMatrix = new Matrix();
private final Matrix mInverse = new Matrix();
private static void setXY(float[] array, int index, float x, float y) {
array[index*2 + 0] = x;
array[index*2 + 1] = y;
}
public SampleView(Context context) {
super(context);
setFocusable(true);
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.beach);
float w = mBitmap.getWidth();
float h = mBitmap.getHeight();
// construct our mesh
int index = 0;
for (int y = 0; y <= HEIGHT; y++) {//设置每个像素点对应的位置
float fy = h * y / HEIGHT;
for (int x = 0; x <= WIDTH; x++) {
float fx = w * x / WIDTH;
setXY(mVerts, index, fx, fy);
setXY(mOrig, index, fx, fy);
index += 1;
}
}
mMatrix.setTranslate(10, 10);
mMatrix.invert(mInverse);
}
@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC);
canvas.concat(mMatrix);//设置canvas的matrix
canvas.drawBitmapMesh(mBitmap, WIDTH, HEIGHT, mVerts, 0,
null, 0, null); //根据mVerts绘制bitmap
}
//改变位置图片对应数组的 形状
//通过调整网格的坐标，可以对图像进行变化，本例实现的效果，但在图像上点击时，就像用手指在一块画布上压下少许（布是软的）
private void warp(float cx, float cy) {
final float K = 10000;
float[] src = mOrig;
float[] dst = mVerts;
for (int i = 0; i < COUNT*2; i += 2) {
float x = src[i+0];
float y = src[i+1];
float dx = cx - x;
float dy = cy - y;
float dd = dx*dx + dy*dy;
float d = FloatMath.sqrt(dd);
float pull = K / (dd + 0.000001f);
pull /= (d + 0.000001f);
// android.util.Log.d("skia", "index " + i + " dist=" + d + " pull=" + pull);
if (pull >= 1) {
dst[i+0] = cx;
dst[i+1] = cy;
} else {
dst[i+0] = x + dx * pull;
dst[i+1] = y + dy * pull;
}
}
}
private int mLastWarpX = -9999; // don't match a touch coordinate
private int mLastWarpY;
@Override public boolean onTouchEvent(MotionEvent event) {
float[] pt = { event.getX(), event.getY() };
mInverse.mapPoints(pt);
int x = (int)pt[0];
int y = (int)pt[1];
if (mLastWarpX != x || mLastWarpY != y) {
mLastWarpX = x;
mLastWarpY = y;
warp(pt[0], pt[1]);
invalidate();
}
return true;
}
}
}
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