我已经使用库MPAndroidChart创建了LineChart,并且一切正常.
现在,我要为图表上的每个条目显示一个可绘制的(图像)而不是默认的圆圈.
我从API尝试了很多选择,但是没有运气.
谁能告诉我该怎么做?
解决方法:
最后,在尝试了很多事情之后,借助@David Rawson的建议和此帖子MPAndroidChart LineChart custom highlight drawable
我设法创建了一个自定义渲染器,该渲染器用提供的图像替换了图表中的默认圆形图像.
以下是解决方案的代码片段.
class ImageLineChartRenderer extends LineChartRenderer {
private final LineChart lineChart;
private final Bitmap image;
ImageLineChartRenderer(LineChart chart, ChartAnimator animator, ViewPortHandler viewPortHandler, Bitmap image) {
super(chart, animator, viewPortHandler);
this.lineChart = chart;
this.image = image;
}
private float[] mCirclesBuffer = new float[2];
@Override
protected void drawCircles(Canvas c) {
mRenderPaint.setStyle(Paint.Style.FILL);
float phaseY = mAnimator.getPhaseY();
mCirclesBuffer[0] = 0;
mCirclesBuffer[1] = 0;
List<ILineDataSet> dataSets = mChart.getLineData().getDataSets();
//Draw bitmap image for every data set with size as radius * 10, and store it in scaled bitmaps array
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 (int i = 0; i < dataSets.size(); i++) {
ILineDataSet dataSet = dataSets.get(i);
if (!dataSet.isVisible() || !dataSet.isDrawCirclesEnabled() || dataSet.getEntryCount() == 0)
continue;
mCirclePaintInner.setColor(dataSet.getCircleHoleColor());
Transformer trans = mChart.getTransformer(dataSet.getAxisDependency());
mXBounds.set(mChart, dataSet);
int boundsRangeCount = mXBounds.range + mXBounds.min;
for (int j = mXBounds.min; j <= boundsRangeCount; j++) {
Entry e = dataSet.getEntryForIndex(j);
if (e == null) break;
mCirclesBuffer[0] = e.getX();
mCirclesBuffer[1] = e.getY() * phaseY;
trans.pointValuesToPixel(mCirclesBuffer);
if (!mViewPortHandler.isInBoundsRight(mCirclesBuffer[0]))
break;
if (!mViewPortHandler.isInBoundsLeft(mCirclesBuffer[0]) || !mViewPortHandler.isInBoundsY(mCirclesBuffer[1]))
continue;
if (scaledBitmaps[i] != null) {
c.drawBitmap(scaledBitmaps[i],
mCirclesBuffer[0] - scaledBitmapOffsets[i],
mCirclesBuffer[1] - scaledBitmapOffsets[i],
mRenderPaint);
}
}
}
}
private Bitmap scaleImage(int radius) {
return Bitmap.createScaledBitmap(image, radius, radius, false);
}
希望这对某人有帮助.