自定义控件_绘制太极(拖动)

来源：互联网发布：淘宝店铺的钱在哪里看编辑：程序博客网时间：2024/05/16 07:18
import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by Administrator on 2017/4/17. */public class MyView extends View{    private static final String TAG = "TJView";    private int padding = 8;    //画笔工具    private Paint mPaint;    //圆心坐标    private float currentX = 0;    private float currentY = 0;    //大圆半径    private float radiusBig = 200;    //中圆半径    private float radiusCenter = radiusBig / 2;    //小圆半径    private float radiusSmall = radiusCenter / 3;    private int width;    private int height;    private float distance;    private final float increment = 10;    private final float min = 50;    public MyView(Context context) {        this(context, null);    }    public MyView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        mPaint = new Paint();        mPaint.setAntiAlias(true);       // setAnimation();    }    /**     * 设置缩放动画     */    /*private void setAnimation() {        ScaleAnimation scaleAnimation2 = new ScaleAnimation(0.7f, 1.0f, 0.7f, 1.0f, ScaleAnimation.RELATIVE_TO_PARENT, 0.5f, ScaleAnimation.RELATIVE_TO_PARENT, 0.5f);        scaleAnimation2.setDuration(500);// 设置持续时间        scaleAnimation2.setRepeatCount(99999);// 设置重复次数        scaleAnimation2.setFillAfter(true);// 保持动画结束时的状态        startAnimation(scaleAnimation2);    }*/    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawBg(canvas);        drawLeftHalfCirle(canvas);        drawTBCirle(canvas);    }    /**     * 画上下两个圆--中圆和小圆     *     * @param canvas     */    private void drawTBCirle(Canvas canvas) {        //画上面的白中圆        mPaint.setColor(Color.WHITE);        canvas.drawCircle(currentX, currentY - radiusBig / 2, radiusCenter, mPaint);        //画上面的黑小圆        mPaint.setColor(Color.BLACK);        canvas.drawCircle(currentX, currentY - radiusBig / 2, radiusSmall, mPaint);        //画下面的黑中圆        mPaint.setColor(Color.BLACK);        canvas.drawCircle(currentX, currentY + radiusBig / 2, radiusCenter, mPaint);        //画下面的白小圆        mPaint.setColor(Color.WHITE);        canvas.drawCircle(currentX, currentY + radiusBig / 2, radiusSmall, mPaint);    }    /**     * 画左边半圆     *     * @param canvas     */    private void drawLeftHalfCirle(Canvas canvas) {        mPaint.setColor(Color.WHITE);        canvas.drawArc(new RectF(currentX - radiusBig, currentY - radiusBig, currentX + radiusBig, currentY + radiusBig), 90, 180, true, mPaint);//90度开始画180度    }    /**     * 画黑色的背景底板     *     * @param canvas     */    private void drawBg(Canvas canvas) {        mPaint.setColor(Color.BLACK);        canvas.drawCircle(currentX, currentY, radiusBig + padding, mPaint);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        currentX = MeasureSpec.getSize(widthMeasureSpec) / 2;        currentY = MeasureSpec.getSize(heightMeasureSpec) / 2;        setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);        width = getWidth();        height = getHeight();    }    @Override    public boolean onTouchEvent(MotionEvent event) {        /*currentX = event.getX();        currentY = event.getY();        invalidate();        return true;*/        //手指的数量        int count = event.getPointerCount();        float x = event.getX();        float y = event.getY();        int action = event.getAction();        if(action==MotionEvent.ACTION_POINTER_DOWN){            distance = getDistance(event);        }        if(count==1) {            if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_MOVE) {                if (x > width - radiusBig) {                    x = width - radiusBig;                } else if (x < radiusBig) {                    currentX = radiusBig;                } else {                    currentX = x;                }                if (y > height - radiusBig) {                    currentY = height - radiusBig;                } else if (y < radiusBig) {                    currentY = radiusBig;                } else {                    currentY = y;                }                postInvalidate();            }        }        else if(count==2&&action == MotionEvent.ACTION_MOVE){            float maxR = 0;            if(currentX<currentY){                maxR = currentX;            }else{                maxR = currentY;            }            //判断手指方向            if(distance>getDistance(event)){                radiusBig -= increment;                if(radiusBig<min){                    radiusBig = min;                }            }else if(distance<getDistance(event)){                radiusBig += increment;                if(radiusBig>maxR){                    radiusBig = maxR;                }else if(radiusBig>width/2){                    radiusBig = width/2;                }            }            distance = getDistance(event);            postInvalidate();        }        return true;    }    private float getDistance(MotionEvent event){        float xOne = event.getX(0);        float yOne = event.getY(0);        float xTwo = event.getX(1);        float yTwo = event.getY(1);        return (xOne - xTwo)*(xOne - xTwo)+(yOne - yTwo)*(yOne - yTwo);    }}
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