我想做个android程序，类似于网上有一个通过摄像头在闪光灯常亮的帮助下，拍摄手指血流运动，从而在屏幕上显示心电图的程序。
我现在很烦恼的是，如何把画出来的心电图向左移动，而且执行速度要快，不要有闪动，诸位有什么比较好的建议和方法吗？
谢谢！
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你可以去看看appdemo里os/Sensors。。他也是一个类似的东西。。
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一个数组存个种点~画的时候把出现在屏幕上的点连起来就行了。比如说line(point1.x, point1.y, point2.x, point2.y)
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代码格式弄错了，晕！
- Java code
private class GraphView extends View implements SensorListener { private Bitmap mBitmap; private Paint mPaint = new Paint(); private Canvas mCanvas = new Canvas(); private Path mPath = new Path(); private RectF mRect = new RectF(); private float mLastValues[] = new float[3 * 2]; private float mOrientationValues[] = new float[3]; private int mColors[] = new int[3 * 2]; private float mLastX; private float mScale[] = new float[2]; private float mYOffset; private float mMaxX; private float mSpeed = 1.0f; private float mWidth; private float mHeight; public GraphView(Context context) { super(context); mColors[0] = Color.argb(192, 255, 64, 64); mColors[1] = Color.argb(192, 64, 128, 64); mColors[2] = Color.argb(192, 64, 64, 255); mColors[3] = Color.argb(192, 64, 255, 255); mColors[4] = Color.argb(192, 128, 64, 128); mColors[5] = Color.argb(192, 255, 255, 64); mPaint.setFlags(Paint.ANTI_ALIAS_FLAG); mRect.set(-0.5f, -0.5f, 0.5f, 0.5f); mPath.arcTo(mRect, 0, 180); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565); mCanvas.setBitmap(mBitmap); mCanvas.drawColor(0xFFFFFFFF); mYOffset = h * 0.5f; mScale[0] = -(h * 0.5f * (1.0f / (SensorManager.STANDARD_GRAVITY * 2))); mScale[1] = -(h * 0.5f * (1.0f / (SensorManager.MAGNETIC_FIELD_EARTH_MAX))); mWidth = w; mHeight = h; if (mWidth < mHeight) { mMaxX = w; } else { mMaxX = w - 50; } mLastX = mMaxX; super.onSizeChanged(w, h, oldw, oldh); } @Override protected void onDraw(Canvas canvas) { synchronized (this) { if (mBitmap != null) { final Paint paint = mPaint; final Path path = mPath; final int outer = 0xFFC0C0C0; final int inner = 0xFFff7010; if (mLastX >= mMaxX) { mLastX = 0; final Canvas cavas = mCanvas; final float yoffset = mYOffset; final float maxx = mMaxX; final float oneG = SensorManager.STANDARD_GRAVITY * mScale[0]; paint.setColor(0xFFAAAAAA); cavas.drawColor(0xFFFFFFFF); cavas.drawLine(0, yoffset, maxx, yoffset, paint); cavas.drawLine(0, yoffset + oneG, maxx, yoffset + oneG, paint); cavas.drawLine(0, yoffset - oneG, maxx, yoffset - oneG, paint); } canvas.drawBitmap(mBitmap, 0, 0, null); float[] values = mOrientationValues; if (mWidth < mHeight) { float w0 = mWidth * 0.333333f; float w = w0 - 32; float x = w0 * 0.5f; for (int i = 0; i < 3; i++) { canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.translate(x, w * 0.5f + 4.0f); canvas.save(Canvas.MATRIX_SAVE_FLAG); paint.setColor(outer); canvas.scale(w, w); canvas.drawOval(mRect, paint); canvas.restore(); canvas.scale(w - 5, w - 5); paint.setColor(inner); canvas.rotate(-values[i]); canvas.drawPath(path, paint); canvas.restore(); x += w0; } } else { float h0 = mHeight * 0.333333f; float h = h0 - 32; float y = h0 * 0.5f; for (int i = 0; i < 3; i++) { canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.translate(mWidth - (h * 0.5f + 4.0f), y); canvas.save(Canvas.MATRIX_SAVE_FLAG); paint.setColor(outer); canvas.scale(h, h); canvas.drawOval(mRect, paint); canvas.restore(); canvas.scale(h - 5, h - 5); paint.setColor(inner); canvas.rotate(-values[i]); canvas.drawPath(path, paint); canvas.restore(); y += h0; } } } } } public void onSensorChanged(int sensor, float[] values) { // Log.d(TAG, "sensor: " + sensor + ", x: " + values[0] + ", y: " + // values[1] + ", z: " + values[2]); synchronized (this) { if (mBitmap != null) { final Canvas canvas = mCanvas; final Paint paint = mPaint; if (sensor == SensorManager.SENSOR_ORIENTATION) { for (int i = 0; i < 3; i++) { mOrientationValues[i] = values[i]; } } else { float deltaX = mSpeed; float newX = mLastX + deltaX; int j = (sensor == SensorManager.SENSOR_MAGNETIC_FIELD) ? 1 : 0; for (int i = 0; i < 3; i++) { int k = i + j * 3; final float v = mYOffset + values[i] * mScale[j]; paint.setColor(mColors[k]); canvas.drawLine(mLastX, mLastValues[k], newX, v, paint); mLastValues[k] = v; } if (sensor == SensorManager.SENSOR_MAGNETIC_FIELD) mLastX += mSpeed; } invalidate(); } } } public void onAccuracyChanged(int sensor, int accuracy) { // TODO Auto-generated method stub } }