android饼图View PieChart 点击旋转 分割

demo

demo (2).gif

使用

Gradle:

compile 'cn.jimzjy.pie-chart:pie-chart:1.0.2'

github 地址

https://github.com/Jimzjy/PieChartView

XML属性

• pie_radius: 设置饼图半径
• centerCircle_radius: 设置中心园半径
• textSize: 设置中间文字大小
• shaderSize: 设置中心园阴影大小

    PieChart pieChart;
    Button button;
    List pieList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        pieChart = (PieChart)findViewById(R.id.pie_chart);
        button = (Button)findViewById(R.id.button1);

        init();

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //设置饼图
                pieChart.setPie(pieList);
                
                //设置饼图中心文字
                pieChart.setCenterText("PieChartTest");

                //画饼图
                pieChart.startDrawPie();
            }
        });
    }

    private void init(){
        pieList = new ArrayList<>();

        pieList.add(new Pie(60.5f,"60.5", Color.parseColor("#F48FB1")));
        pieList.add(new Pie(71.2f,"71.2", Color.parseColor("#CE93D8")));
        pieList.add(new Pie(90.9f,"90.9", Color.parseColor("#90CAF9")));
        pieList.add(new Pie(50f,"50", Color.parseColor("#FFE082")));
        pieList.add(new Pie(100f,"100", Color.parseColor("#FFAB91")));
    }

点击旋转 分割 原理

setPie() 中

        float angleTemp;
        float startAngleTemp = DEFAULT_START_ANGLE;
        
        //设置饼图属性时，记录每个饼图中间角度
        for (float v : pieValueList) {
            angleTemp = 360 * v / mMaxValue;

            angleList.add(startAngleTemp + angleTemp / 2);

            startAngleTemp += angleTemp;
        }

i 为当前点击的扇形的index
得到旋转的角度，正为顺时针，负为逆时针

private float getRotationAngle(int i) {
        float angleR;
        float angleT = angleList.get(i);
        if (angleT <= 270f && angleT >= 90f) {
            angleR = 90f - angleT;
        } else if (angleT > 270f && angleT <= 360f) {
            angleR = 360f - angleT + 90f;
        } else if (angleT >= 0 && angleT < 90) {
            angleR = 90 - angleT;
        } else {
            angleR = 0;
            Log.w(TAG, "Angle < 0 || Angle > 360");
        }

        for (int id = 0; id < angleList.size(); id++) {
            float temp = angleList.get(id) + angleR;
            if (temp > 360f) {
                temp -= 360f;
            } else if (temp < 0) {
                temp += 360f;
            }
            angleList.set(id, temp);
        }
        return angleR;
    }

控制点击分割的属性动画

        animatorTouch = ValueAnimator.ofFloat(1f, 1.07f);
        animatorTouch.setDuration(400);
        animatorTouch.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {

                //控制饼图的半径缩放，来达到弹出的效果
                curtFractionTouch = (Float) animation.getAnimatedValue();
                //控制饼图角度缩放，来达到弹出时角度变小的效果
                curtFractionTouch2 = 0.02f * animation.getAnimatedFraction();

                invalidate();
            }
        });

onDraw中画点击的扇形时调用

private void drawPieTouch(Canvas canvas, float amount) {

        mPaint1.setColor(mCurrentColor);

        float mAngle = 360 * curtFraction * amount / mMaxValue;

        //改变扇形半径
        float mRadiusTemp = mRadius * curtFractionTouch;

        //mStartAngle + mAngle * curtFractionTouch2 和
        //mAngle - mAngle * curtFractionTouch2 * 2 控制角度变小
        canvas.drawArc(centerX - mRadiusTemp, centerY - mRadiusTemp, centerX + mRadiusTemp,
                centerY + mRadiusTemp, mStartAngle + mAngle * curtFractionTouch2,
                mAngle - mAngle * curtFractionTouch2 * 2, true, mPaint1);

        mStartAngle += mAngle;

    }