我必须更改用户在条形图中选择的特定条形图的颜色。 当用户选择栏时，我想要更改该栏的颜色，如果用户更改栏的选择，则最后选择的栏将显示为默认颜色。
注意：我在一篇文章中看到，我必须再使用一个包含所选栏的系列，以便您可以实现这一目标。但是我需要一些示例代码来理解它。
private String[] mMonth = new String[] { "January", "Feburary", "March", "April", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec" };
int[] x = { 0, 1, 2, 3, 4, 5, 6, 7 };
int[] income = { 2000, 2500, 2700, 3000, 2800, 3500, 3700, 3800 };
public static final String TYPE = "type";
private XYMultipleSeriesDataset mDataset = getDemoDataset();
private XYMultipleSeriesRenderer mRenderer = getDemoRenderer();
private GraphicalView mChartView;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.xy_chart);
if (mChartView == null) {
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
mChartView = ChartFactory.getBarChartView(this, mDataset, mRenderer, Type.DEFAULT);
mRenderer.setSelectableBuffer(100);
layout.addView(mChartView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
} else {
mChartView.repaint();
}
mChartView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// handle the click event on the chart
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();
if (seriesSelection == null) {
Toast.makeText(NewTest.this, "No chart element", Toast.LENGTH_SHORT).show();
} else {
for (int i = 0; i < x.length; i++) {
SimpleSeriesRenderer renderer = mRenderer.getSeriesRendererAt(seriesSelection.getSeriesIndex());
renderer.setColor(Color.RED);
}
mChartView.repaint();
// display information of the clicked point
Toast.makeText(
NewTest.this,
"Chart element in series index " + seriesSelection.getSeriesIndex()
+ " data point index " + seriesSelection.getPointIndex() + " was clicked"
+ " closest point value X=" + seriesSelection.getXValue() + ", Y="
+ seriesSelection.getValue(), Toast.LENGTH_SHORT).show();
}
}
});
}
private XYMultipleSeriesDataset getDemoDataset() {
XYSeries incomeSeries = new XYSeries("Income");
for (int i = 0; i < x.length; i++) {
incomeSeries.add(i, income[i]);
}
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
dataset.addSeries(incomeSeries);
return dataset;
}
private XYMultipleSeriesRenderer getDemoRenderer() {
XYSeriesRenderer incomeRenderer = new XYSeriesRenderer();
incomeRenderer.setColor(Color.rgb(130, 130, 230));
incomeRenderer.setFillPoints(true);
incomeRenderer.setLineWidth(2);
incomeRenderer.setChartValuesTextAlign(Align.CENTER);
incomeRenderer.setChartValuesSpacing(15);
incomeRenderer.setDisplayChartValues(true);
XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setXLabels(0);
multiRenderer.setYLabelsPadding(15);
multiRenderer.setBarSpacing(0.3f);
multiRenderer.setBarWidth(30);
multiRenderer.setChartTitle("Income Chart");
multiRenderer.setXTitle("Year 2013");
multiRenderer.setYTitle("Amount in Dollars");
//multiRenderer.setZoomLimits(1.0,0.7,1.0,3000.0);
multiRenderer.setZoomButtonsVisible(true);
//multiRenderer.setZoomEnabled(true, true);
//multiRenderer.setPanEnabled(true, true);
multiRenderer.setInScroll(true);
multiRenderer.setXAxisMin(-0.5);
multiRenderer.setXAxisMax(7);
multiRenderer.setYAxisMin(0);
multiRenderer.setYAxisMax(4000);
multiRenderer.setMargins(new int[] {30, 50, 20, 10});
multiRenderer.setClickEnabled(true);
multiRenderer.setShowGridX(true);
for (int i = 0; i < x.length; i++) {
multiRenderer.addXTextLabel(i, mMonth[i]);
}
multiRenderer.addSeriesRenderer(incomeRenderer);
return multiRenderer;
}
}
答案 0 :(得分：0)
我看到你正在处理图表视图上的点击事件。每个酒吧系列都有自己的颜色。为了拥有不同颜色的条形，它必须属于另一个系列。在这种情况下，您必须从它所属的系列中删除该栏，并添加另一个只包含一个项目的系列，即所选栏。
在第二次单击时，反转上面的操作。
答案 1 :(得分：0)
对于那些仍对此感兴趣的人。没有必要添加另一个系列（它将单独绘制）。你可以扩展图表并按照下面的例子进行绘图。 （在我的项目中，我使用自己的滚动/缩放通过GestureDetector和ScaleGestureDetector，而不是onClick我使用GestureDetector的onSingleTapUp）。使用下面的类中的getView来获取图表视图的实例：
public class SelectableBarChart extends BarChart {
private int selectedSeriesIndex = -1;
private int selectedBar = -1;
private final int highlightColor;
private OnBarSelectedListener barSelectedListener;
public static interface OnBarSelectedListener {
void onBarSelected(SeriesSelection seriesSelection);
}
public void setBarSelectedListener(OnBarSelectedListener barSelectedListener) {
this.barSelectedListener = barSelectedListener;
}
public static GraphicalView getView(Context context, XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer, Type type, int highlightColor) {
final SelectableBarChart chart = new SelectableBarChart(dataset, renderer, type, highlightColor);
final GraphicalView graphicalView = new GraphicalView(context, chart);
graphicalView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
chart.onClick(graphicalView);
}
});
return graphicalView;
}
public void onClick(GraphicalView view) {
onSelectionTap(view, view.getCurrentSeriesAndPoint());
}
protected void onSelectionTap(GraphicalView view, SeriesSelection seriesSelection) {
if (seriesSelection != null) {
selectedSeriesIndex = seriesSelection.getSeriesIndex();
XYSeries selectedSeries = getDataset().getSeriesAt(selectedSeriesIndex);
selectedBar = selectedSeries.getIndexForKey(seriesSelection.getXValue());
}
if (barSelectedListener != null)
barSelectedListener.onBarSelected(seriesSelection);
view.repaint();
}
@Override
public void drawSeries(Canvas canvas, Paint paint, List<Float> points, SimpleSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, int startIndex) {
int seriesNr = mDataset.getSeriesCount();
boolean selectedSeries = seriesIndex == selectedSeriesIndex;
int length = points.size();
paint.setStyle(Paint.Style.FILL);
float halfDiffX = getHalfDiffX(points, length, seriesNr);
for (int i = 0; i < length; i += 2) {
paint.setColor(selectedSeries && i == 2*(selectedBar-startIndex) ? highlightColor : seriesRenderer.getColor());
float x = points.get(i);
float y = points.get(i + 1);
drawBar(canvas, x, yAxisValue, x, y, halfDiffX, seriesNr, seriesIndex, paint);
}
paint.setColor(seriesRenderer.getColor());
}
}