Android图表库MPAndroidChart(九)——神神秘秘的散点图

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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