自从3.0版本,你可以提供将在上选择一个给定的点来显示自己的自定义图像图表。下面的说明是按照the wiki
总之,你现在可以使用名为MarkerImage
类:
MarkerImage myMarkerImage = new MarkerImage(this, R.drawable.my_drawable);
然后:
myChart.setMarker(myMarkerImage);
要调整图像的位置,你可以调用:
setOffset(float x, float y);
如果你不想使用MarkerView
,您可能必须创建自己的LineChartRenderer
的子类,并添加逻辑以绘制自定义高光可绘制。
这里是概念的一个非常基本的证明:
import android.graphics.Bitmap;
import android.graphics.Canvas;
import com.github.mikephil.charting.animation.ChartAnimator;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.interfaces.datasets.ILineDataSet;
import com.github.mikephil.charting.renderer.LineChartRenderer;
import com.github.mikephil.charting.utils.Transformer;
import com.github.mikephil.charting.utils.ViewPortHandler;
import java.util.List;
/**
* Created by David on 3/01/2017.
*/
public class ImageLineChartRenderer extends LineChartRenderer {
private final LineChart lineChart;
private final Bitmap image;
public ImageLineChartRenderer(LineChart chart, ChartAnimator animator, ViewPortHandler viewPortHandler, Bitmap image) {
super(chart, animator, viewPortHandler);
this.lineChart = chart;
this.image = image;
}
@Override
public void drawExtras(Canvas c) {
super.drawExtras(c);
Highlight[] highlighted = lineChart.getHighlighted();
if (highlighted == null) return;
float phaseY = mAnimator.getPhaseY();
float[] imageBuffer = new float[2];
imageBuffer[0] = 0;
imageBuffer[1] = 0;
LineData lineData = mChart.getLineData();
List<ILineDataSet> dataSets = mChart.getLineData().getDataSets();
Bitmap[] scaledBitmaps = new Bitmap[dataSets.size()];
float[] scaledBitmapOffsets = new float[dataSets.size()];
for (int i = 0; i < dataSets.size(); i++) {
float imageSize = dataSets.get(i).getCircleRadius() * 10;
scaledBitmapOffsets[i] = imageSize/2f;
scaledBitmaps[i] = scaleImage((int) imageSize);
}
for (Highlight high : highlighted) {
int dataSetIndex = high.getDataSetIndex();
ILineDataSet set = lineData.getDataSetByIndex(dataSetIndex);
Transformer trans = lineChart.getTransformer(set.getAxisDependency());
if (set == null || !set.isHighlightEnabled())
continue;
Entry e = set.getEntryForXValue(high.getX(), high.getY());
if (!isInBoundsX(e, set))
continue;
imageBuffer[0] = e.getX();
imageBuffer[1] = e.getY() * phaseY;
trans.pointValuesToPixel(imageBuffer);
c.drawBitmap(scaledBitmaps[dataSetIndex],
imageBuffer[0] - scaledBitmapOffsets[dataSetIndex],
imageBuffer[1] - scaledBitmapOffsets[dataSetIndex],
mRenderPaint);
}
}
private Bitmap scaleImage(int radius) {
return Bitmap.createScaledBitmap(image, radius, radius, false);
}
}
消耗它是这样的:
Bitmap starBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.star);
mChart.setRenderer(new ImageLineChartRenderer(mChart, mChart.getAnimator(), mChart.getViewPortHandler(), starBitmap));
说明:drawExtras
在LineChartRenderer
绘制圆。我们仍然想要这些,所以在我们的drawExtras
覆盖,我们称之为超级第一。然后我们为每个DataSet生成缩放的位图(DataSet可能有不同的圆半径)。我们将位图缩放到任意大小(圆圈半径的10倍)。然后,我们遍历通过渲染器的LineChart字段暴露的Highlights,并绘制相应的位图。
下面是截图 - 你可以看到“明星”图而不是圆上突出显示指数:
你是什么意思“关掉这个洞可绘”是什么意思?你想自己绘制而不是CircleHole吗? – Paamand
您是否找到了更改可突出显示的解决方案? – Massimo
@Massimo请看我最新的答案,其中包含示例代码 –