Android绘图板

来源：互联网发布：mac终端怎么使用编辑：程序博客网时间：2024/06/04 17:52
public class DrawPadView extends View {    private Path mPath;    private Paint mPaint;    private float mX;    private float mY;    public DrawPadView(Context context) {        super(context);    }    public DrawPadView(Context context, AttributeSet attrs) {        super(context, attrs);        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(5);        mPath = new Path();    }    public DrawPadView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                mPath.reset();                mX = event.getX();                mY = event.getY();                mPath.moveTo(mX, mY);                break;            case MotionEvent.ACTION_MOVE:                float x1 = event.getX();                float y1 = event.getY();                float cx = (x1 + mX) / 2;                float cy = (y1 + mY) / 2;                //使用Bezier曲线,圆滑处理                mPath.quadTo(mX, mY, cx, cy);                mX = x1;                mY = y1;        }        invalidate();        return true;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawPath(mPath, mPaint);    }}
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