Android图表库MPAndroidChart(九)——神神秘秘的散点图

今天所的散点图可能用的人不多，但是也算是图表界的一股清流，我们来看下实际的效果

添加的数据有点少，但是足以表示散点图了，我们先实现它

一.基本实现

实现还是老套路，看下布局

<com.github.mikephil.charting.charts.ScatterChart
        android:id="@+id/mScatterChart"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

散点图的View是ScatterChart，我们看下初始化

        //散点图
        mScatterChart = (ScatterChart) findViewById(R.id.mScatterChart);
        mScatterChart.getDescription().setEnabled(false);
        mScatterChart.setOnChartValueSelectedListener(this);

        mScatterChart.setDrawGridBackground(false);
        mScatterChart.setTouchEnabled(true);
        mScatterChart.setMaxHighlightDistance(10f);

        // 支持缩放和拖动
        mScatterChart.setDragEnabled(true);
        mScatterChart.setScaleEnabled(true);

        mScatterChart.setMaxVisibleValueCount(10);
        mScatterChart.setPinchZoom(true);

        Legend l = mScatterChart.getLegend();
        l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);
        l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT);
        l.setOrientation(Legend.LegendOrientation.VERTICAL);
        l.setDrawInside(false);
        l.setXOffset(5f);

        YAxis yl = mScatterChart.getAxisLeft();
        yl.setAxisMinimum(0f);

        mScatterChart.getAxisRight().setEnabled(false);

        XAxis xl = mScatterChart.getXAxis();
        xl.setDrawGridLines(false);

        setData();

可以明确一点的是，他的代码量是比较少的，说明简单啊，我们去理解就不是这么难了，我们模拟一些数据

    //设置数据
    private void setData() {
        ArrayList<Entry> yVals1 = new ArrayList<Entry>();
        ArrayList<Entry> yVals2 = new ArrayList<Entry>();
        ArrayList<Entry> yVals3 = new ArrayList<Entry>();

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals1.add(new Entry(i, val));
        }

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals2.add(new Entry(i + 0.33f, val));
        }

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals3.add(new Entry(i + 0.66f, val));
        }

        //创建一个数据集,并给它一个类型
        ScatterDataSet set1 = new ScatterDataSet(yVals1, "优秀");
        set1.setScatterShape(ScatterChart.ScatterShape.SQUARE);
        //设置颜色
        set1.setColor(ColorTemplate.COLORFUL_COLORS[0]);
        ScatterDataSet set2 = new ScatterDataSet(yVals2, "及格");
        set2.setScatterShape(ScatterChart.ScatterShape.CIRCLE);
        set2.setScatterShapeHoleColor(ColorTemplate.COLORFUL_COLORS[3]);
        set2.setScatterShapeHoleRadius(3f);
        set2.setColor(ColorTemplate.COLORFUL_COLORS[1]);
        ScatterDataSet set3 = new ScatterDataSet(yVals3, "不及格");
        set3.setShapeRenderer(new CustomScatterShapeRenderer());
        set3.setColor(ColorTemplate.COLORFUL_COLORS[2]);

        set1.setScatterShapeSize(8f);
        set2.setScatterShapeSize(8f);
        set3.setScatterShapeSize(8f);

        ArrayList<IScatterDataSet> dataSets = new ArrayList<IScatterDataSet>();
        dataSets.add(set1);
        dataSets.add(set2);
        dataSets.add(set3);

        //创建一个数据集的数据对象
        ScatterData data = new ScatterData(dataSets);

        mScatterChart.setData(data);
        mScatterChart.invalidate();
    }

这样就实现完成了，也就是上面的那幅图片的效果了

二.x轴动画

三.y轴动画

四.xy轴动画

可以看到，他的扩展也是比较少的，我们看一下完整的代码

activity_scatter.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.github.mikephil.charting.charts.ScatterChart
        android:id="@+id/mScatterChart"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_show_values"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="顶点显示值"/>

        <Button
            android:id="@+id/btn_anim_x"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="X轴动画"/>

        <Button
            android:id="@+id/btn_anim_y"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Y轴动画"/>

        <Button
            android:id="@+id/btn_anim_xy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="XY轴动画"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_save_pic"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="保存到相册"/>

        <Button
            android:id="@+id/btn_auto_mix_max"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="自动最大最小值"/>

        <Button
            android:id="@+id/btn_actionToggleHighlight"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="高亮显示"/>

    </LinearLayout>

</LinearLayout>

ScatterChartActivity

public class ScatterChartActivity extends BaseActivity implements OnChartValueSelectedListener, View.OnClickListener {

    private ScatterChart mScatterChart;

    //显示顶点值
    private Button btn_show_values;
    //x轴动画
    private Button btn_anim_x;
    //y轴动画
    private Button btn_anim_y;
    //xy轴动画
    private Button btn_anim_xy;
    //保存到sd卡
    private Button btn_save_pic;
    //切换自动最大最小值
    private Button btn_auto_mix_max;
    //高亮显示
    private Button btn_actionToggleHighlight;

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

        initView();
    }

    //初始化View
    private void initView() {

        //基本控件
        btn_show_values = (Button) findViewById(R.id.btn_show_values);
        btn_show_values.setOnClickListener(this);
        btn_anim_x = (Button) findViewById(R.id.btn_anim_x);
        btn_anim_x.setOnClickListener(this);
        btn_anim_y = (Button) findViewById(R.id.btn_anim_y);
        btn_anim_y.setOnClickListener(this);
        btn_anim_xy = (Button) findViewById(R.id.btn_anim_xy);
        btn_anim_xy.setOnClickListener(this);
        btn_save_pic = (Button) findViewById(R.id.btn_save_pic);
        btn_save_pic.setOnClickListener(this);
        btn_auto_mix_max = (Button) findViewById(R.id.btn_auto_mix_max);
        btn_auto_mix_max.setOnClickListener(this);
        btn_actionToggleHighlight = (Button) findViewById(R.id.btn_actionToggleHighlight);
        btn_actionToggleHighlight.setOnClickListener(this);

        //散点图
        mScatterChart = (ScatterChart) findViewById(R.id.mScatterChart);
        mScatterChart.getDescription().setEnabled(false);
        mScatterChart.setOnChartValueSelectedListener(this);

        mScatterChart.setDrawGridBackground(false);
        mScatterChart.setTouchEnabled(true);
        mScatterChart.setMaxHighlightDistance(10f);

        // 支持缩放和拖动
        mScatterChart.setDragEnabled(true);
        mScatterChart.setScaleEnabled(true);

        mScatterChart.setMaxVisibleValueCount(10);
        mScatterChart.setPinchZoom(true);

        Legend l = mScatterChart.getLegend();
        l.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);
        l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT);
        l.setOrientation(Legend.LegendOrientation.VERTICAL);
        l.setDrawInside(false);
        l.setXOffset(5f);

        YAxis yl = mScatterChart.getAxisLeft();
        yl.setAxisMinimum(0f);

        mScatterChart.getAxisRight().setEnabled(false);

        XAxis xl = mScatterChart.getXAxis();
        xl.setDrawGridLines(false);

        setData();
    }

    //设置数据
    private void setData() {
        ArrayList<Entry> yVals1 = new ArrayList<Entry>();
        ArrayList<Entry> yVals2 = new ArrayList<Entry>();
        ArrayList<Entry> yVals3 = new ArrayList<Entry>();

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals1.add(new Entry(i, val));
        }

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals2.add(new Entry(i + 0.33f, val));
        }

        for (int i = 0; i < 10; i++) {
            float val = (float) (Math.random() * 10 + 3);
            yVals3.add(new Entry(i + 0.66f, val));
        }

        //创建一个数据集,并给它一个类型
        ScatterDataSet set1 = new ScatterDataSet(yVals1, "优秀");
        set1.setScatterShape(ScatterChart.ScatterShape.SQUARE);
        //设置颜色
        set1.setColor(ColorTemplate.COLORFUL_COLORS[0]);
        ScatterDataSet set2 = new ScatterDataSet(yVals2, "及格");
        set2.setScatterShape(ScatterChart.ScatterShape.CIRCLE);
        set2.setScatterShapeHoleColor(ColorTemplate.COLORFUL_COLORS[3]);
        set2.setScatterShapeHoleRadius(3f);
        set2.setColor(ColorTemplate.COLORFUL_COLORS[1]);
        ScatterDataSet set3 = new ScatterDataSet(yVals3, "不及格");
        set3.setShapeRenderer(new CustomScatterShapeRenderer());
        set3.setColor(ColorTemplate.COLORFUL_COLORS[2]);

        set1.setScatterShapeSize(8f);
        set2.setScatterShapeSize(8f);
        set3.setScatterShapeSize(8f);

        ArrayList<IScatterDataSet> dataSets = new ArrayList<IScatterDataSet>();
        dataSets.add(set1);
        dataSets.add(set2);
        dataSets.add(set3);

        //创建一个数据集的数据对象
        ScatterData data = new ScatterData(dataSets);

        mScatterChart.setData(data);
        mScatterChart.invalidate();
    }

    @Override
    public void onValueSelected(Entry e, Highlight h) {

    }

    @Override
    public void onNothingSelected() {

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            //显示顶点值
            case R.id.btn_show_values:
                for (IDataSet set : mScatterChart.getData().getDataSets())
                    set.setDrawValues(!set.isDrawValuesEnabled());

                mScatterChart.invalidate();
                break;
            //x轴动画
            case R.id.btn_anim_x:
                mScatterChart.animateX(3000);
                break;
            //y轴动画
            case R.id.btn_anim_y:
                mScatterChart.animateY(3000);
                break;
            //xy轴动画
            case R.id.btn_anim_xy:
                mScatterChart.animateXY(3000, 3000);
                break;
            //保存到sd卡
            case R.id.btn_save_pic:
                if (mScatterChart.saveToGallery("title" + System.currentTimeMillis(), 50)) {
                    Toast.makeText(getApplicationContext(), "保存成功",
                            Toast.LENGTH_SHORT).show();
                } else
                    Toast.makeText(getApplicationContext(), "保存失败",
                            Toast.LENGTH_SHORT).show();
                break;
            //切换自动最大最小值
            case R.id.btn_auto_mix_max:
                mScatterChart.setAutoScaleMinMaxEnabled(!mScatterChart.isAutoScaleMinMaxEnabled());
                mScatterChart.notifyDataSetChanged();
                break;
            //高亮显示
            case R.id.btn_actionToggleHighlight:
                if (mScatterChart.getData() != null) {
                    mScatterChart.getData().setHighlightEnabled(
                            !mScatterChart.getData().isHighlightEnabled());
                    mScatterChart.invalidate();
                }
                break;
        }
    }
}

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