提供横向滚动

Author: huangyanbin

app/src/main/java/com/bin/david/smartchart/LineChartActivity.java

@@ -60,18 +60,30 @@ protected void onCreate(Bundle savedInstanceState) {
         chartYDataList.add("Paris");
         chartYDataList.add("Hong Kong");
         chartYDataList.add("Singapore");
+        chartYDataList.add("Tokyo");
+        chartYDataList.add("Paris");
+        chartYDataList.add("Hong Kong");
+        chartYDataList.add("Singapore");
         List<LineData> ColumnDatas = new ArrayList<>();
         ArrayList<Double> tempList1 = new ArrayList<>();
         tempList1.add(26d);
         tempList1.add(-35d);
         tempList1.add(-40d);
         tempList1.add(10d);
+        tempList1.add(26d);
+        tempList1.add(-35d);
+        tempList1.add(-40d);
+        tempList1.add(10d);
         final LineData columnData1 = new LineData("Temperature", "℃", IAxis.AxisDirection.RIGHT, getResources().getColor(R.color.arc3), tempList1);
         ArrayList<Double> humidityList = new ArrayList<>();
         humidityList.add(60d);
         humidityList.add(50d);
         humidityList.add(30d);
         humidityList.add(65d);
+        humidityList.add(60d);
+        humidityList.add(50d);
+        humidityList.add(30d);
+        humidityList.add(65d);
         LineData columnData2 = new LineData("Humidity", "RH%", getResources().getColor(R.color.arc2), humidityList);
         ColumnDatas.add(columnData1);
         ColumnDatas.add(columnData2);
@@ -137,6 +149,7 @@ public String[] format(LineData lineData, int position) {
         lineChart.getProvider().setTip(tip);
         //设置显示标题
         lineChart.setShowChartName(true);
+        lineChart.getMatrixHelper().setWidthMultiple(3);
         //设置标题方向
         lineChart.getChartTitle().setDirection(IComponent.TOP);
         //设置标题比例

app/src/main/res/layout/activity_line.xml

@@ -10,7 +10,7 @@
    <com.daivd.chart.core.LineChart
 
        android:id="@+id/lineChart"
-       android:layout_width="2000dp"
+       android:layout_width="match_parent"
        android:background="#f4f4f4"
        android:layout_height="400dp"/>
 

chart/src/main/java/com/daivd/chart/core/base/BaseChart.java

@@ -197,6 +197,8 @@ public ChartData<C> getChartData() {
         return chartData;
     }
 
+
+
     /**
      * 设置图表数据源
      */

chart/src/main/java/com/daivd/chart/matrix/MatrixHelper.java

@@ -2,6 +2,7 @@
 
 import android.content.Context;
 import android.graphics.Rect;
+import android.util.Log;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
@@ -33,6 +34,7 @@ public class MatrixHelper extends Observable<ChartGestureObserver> implements IT
     private Rect zoomRect;
     private float mDownX, mDownY;
     private int pointMode; //屏幕的手指点个数
+    private float widthMultiple =1;
 
 
     public MatrixHelper(Context context) {
@@ -249,27 +251,42 @@ public Rect getZoomProviderRect(Rect providerRect) {
         Rect scaleRect = new Rect();
         int oldw = providerRect.width();
         int oldh = providerRect.height();
-        int newWidth = (int) (oldw * zoom);
+        int multipleWidth = (int) (oldw *widthMultiple);
+
+        int newWidth = (int) (multipleWidth * zoom);
         int newHeight = (int) (oldh * zoom);
-        int maxTranslateX = Math.abs(newWidth - oldw) / 2;
+        int offsetX = (int) (oldw*(zoom-1))/2;
+        int offsetY =(int) (oldh*(zoom-1))/2;
+        int maxTranslateLeft = (int)Math.abs(oldw*(zoom-1) / 2);
+        int maxTranslateRight = newWidth - oldw - offsetX;
         int maxTranslateY = Math.abs(newHeight - oldh) / 2;
-        if (Math.abs(translateX) > maxTranslateX) {
-            translateX = translateX > 0 ? maxTranslateX : -maxTranslateX;
+        if(translateX >maxTranslateRight){
+            translateX = maxTranslateRight;
+        }
+        if(translateX < -maxTranslateLeft){
+            translateX = -maxTranslateLeft;
         }
         if (Math.abs(translateY) > maxTranslateY) {
             translateY = translateY > 0 ? maxTranslateY : -maxTranslateY;
         }
-        int offsetX = (newWidth - oldw) / 2;
-        int offsetY = (newHeight - oldh) / 2;
+
         scaleRect.left = providerRect.left - offsetX - translateX;
-        scaleRect.right = providerRect.right + offsetX - translateX;
+        scaleRect.right=scaleRect.left+newWidth;
         scaleRect.top = providerRect.top - offsetY - translateY;
-        scaleRect.bottom = providerRect.bottom + offsetY - translateY;
+        scaleRect.bottom = scaleRect.top+newHeight;
         zoomRect = scaleRect;
         return scaleRect;
     }
 
 
+    public float getWidthMultiple() {
+        return widthMultiple;
+    }
+
+    public void setWidthMultiple(int widthMultiple) {
+        this.widthMultiple = widthMultiple;
+    }
+
     public boolean isCanZoom() {
         zoom = 1f;
         return isCanZoom;