Class类探索（一）

来源：互联网发布：c语言中的贪心算法编辑：程序博客网时间：2024/05/21 06:45
感觉阔别scdn已经很久了，一个是项目比较忙，一个是许多想写的东西不敢轻易下笔写，最近又看了一些书，就更没有时间了，前天动手画了个表，贴贴代码，尚未完成，后续更新。
/** * Created by Administrator  * draw a clock */public class MyClock extends View {    private Paint paintCircle;    private Paint paintScale;    private Paint paintPointerMinute;    private Paint paintPointerHour;    public MyClock(Context context) {        super(context);        init(context);    }    public MyClock(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init(context);    }    public MyClock(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context);    }    public MyClock(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);        init(context);    }    /**     * 外圆；圆心：屏幕中心；半径：屏幕宽的一半     */    private void init(Context context) {        /*---------------------*/        DisplayMetrics displayMetrics = new DisplayMetrics();        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        windowManager.getDefaultDisplay().getMetrics(displayMetrics);        int screenWidth = displayMetrics.widthPixels;        int screenHeight = displayMetrics.heightPixels;        LogT.i("屏幕的宽高是：" + screenWidth + ";" + screenHeight);         /*---------------------*/        paintCircle = new Paint();        paintCircle.setStyle(Paint.Style.STROKE);        paintCircle.setAntiAlias(true);        paintCircle.setStrokeWidth(5f);        paintCircle.setColor(Color.RED);        paintScale = new Paint();        paintScale.setColor(Color.RED);        paintScale.setAntiAlias(true);        paintScale.setStrokeWidth(3f);        paintPointerMinute = new Paint();        paintPointerMinute.setAntiAlias(true);        paintPointerMinute.setStrokeWidth(10f);        paintPointerMinute.setColor(Color.BLACK);        paintPointerHour = new Paint();        paintPointerHour.setAntiAlias(true);        paintPointerHour.setStrokeWidth(20f);        paintPointerHour.setColor(Color.BLACK);    }    // TODO: 2017/6/27    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2, getMeasuredWidth() / 2, paintCircle);        //paint the scale        drawScale(canvas);        // paint the pointer        drawPointer(canvas);    }    /**     *  paint the pointer     * @param canvas canvas     */    private void drawPointer(final Canvas canvas) {        canvas.translate(getMeasuredWidth()/2,getMeasuredHeight()/2);        canvas.drawLine(0,0,100,100,paintPointerHour);        canvas.drawLine(0,0,100,200,paintPointerMinute);        canvas.save();    }    /**     *  paint the scale     * @param canvas canvas     */    private void drawScale(Canvas canvas) {        for (int i = 1;i<=12;i++) {            //翻转画布            canvas.rotate(30,getMeasuredWidth()/2,getMeasuredHeight()/2);            if (i ==3||i == 6|| i ==9||i == 12) {                paintScale.setStrokeWidth(5f);                paintScale.setTextSize(30f);                canvas.drawLine(getMeasuredWidth()/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2,                        getMeasuredWidth()/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2+50,                        paintScale);                String s = String.valueOf(i);                canvas.drawText(s,(getMeasuredWidth()-paintScale.measureText(s))/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2+100,                        paintScale);            }else {                paintScale.setStrokeWidth(3f);                paintScale.setTextSize(20f);                canvas.drawLine(getMeasuredWidth()/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2,                        getMeasuredWidth()/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2+30,                        paintScale);                String s = String.valueOf(i);                canvas.drawText(s,(getMeasuredWidth()-paintScale.measureText(s))/2,                        (getMeasuredHeight()-Math.min(getMeasuredWidth(),getMeasuredHeight()))/2+80,                        paintScale);            }        }    }}
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