答案 0 :(得分：0)
我一直在尝试像JFreeChart和GRAL这样的几个库，但是它们在JavaFX中没有像我想要的那样工作，所以我尝试创建自己的SemiCircleChart类。这是非常基础的，因为它扩展Parent时它应该扩展Chart（我猜）。我对Java和编程很新，所以请耐心等待，因为我猜有很多东西可以改进（如果你想到的话，请编辑我的答案！）。所以这就是我所做的：
SemiCircleChart.java
import java.util.List;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.control.Tooltip;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
public class SemiCircleChart extends Parent{ //TODO: this should extend Chart in the future
private List<Data> dataList;
private double centerX;
private double centerY;
private double radius;
private double innerHoleRadius;
private double separatorLength;
private Color holeColor = Color.web("#f4f4f4");
private Color separatorColor = holeColor;
public SemiCircleChart(List<Data> data){
this(data, 0, 0,100);
}
public SemiCircleChart(List<Data> dataList, double centerX, double centerY, double radius){
this(dataList,centerX,centerY,radius,0,0);
}
public SemiCircleChart(List<Data> dataList, double centerX, double centerY, double radius, double innerHoleRadius, double separatorLength){
this.dataList = dataList;
this.centerX = centerX;
this.centerY = centerY;
this.radius = radius;
this.innerHoleRadius = innerHoleRadius;
this.separatorLength = separatorLength;
makeChart();
}
public void setHoleColor(Color holeColor){
this.holeColor = holeColor;
//reset the chart
this.getChildren().clear();
makeChart();
}
public void setSeparatorColor(Color separatorColor){
this.separatorColor = separatorColor;
//reset the chart
this.getChildren().clear();
makeChart();
}
private void makeChart(){
double totalValues=0;
for(Data data:dataList){
totalValues += data.getValue();
}
double ratio = totalValues/180;
double totalAngle=180;
for(int i=0;i<dataList.size();i++){
Data data = dataList.get(i);
Arc slice = new Arc();
slice.setCenterX(centerX);
slice.setCenterY(centerY);
slice.setRadiusX(radius);
slice.setRadiusY(radius);
slice.setType(ArcType.ROUND);
slice.setFill(data.getColor());
slice.setStartAngle(totalAngle);
double length = data.getValue()/ratio;
slice.setLength(-length);
totalAngle -= length;
//adding a tooltip
Tooltip tooltip = new Tooltip(data.getName());
slice.setOnMouseEntered(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
slice.setFill(data.getColor().brighter());
tooltip.show(slice, event.getScreenX()+10, event.getScreenY()+10);
}
});
slice.setOnMouseExited(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
slice.setFill(data.getColor());
tooltip.hide();
}
});
this.getChildren().add(slice);
if(separatorLength<0){
throw new IllegalArgumentException("separatorLength can't be negative");
}
else if(separatorLength>0&&i<dataList.size()-1){
Arc sep = new Arc();
sep.setCenterX(centerX);
sep.setCenterY(centerY);
sep.setRadiusX(radius+1);//enough to cover the border of the slice
sep.setRadiusY(radius+1);
sep.setType(ArcType.ROUND);
sep.setFill(separatorColor);
sep.setLength(-separatorLength);
//we calculate the start angle so half of the separator overlaps one slice and the other half the next slice.
double halfLength = separatorLength/2;
sep.setStartAngle(totalAngle+halfLength);
this.getChildren().add(sep);
}
}
if(innerHoleRadius<0){
throw new IllegalArgumentException("innerHoleRadius can't be negative");
}
else{
Arc hole = new Arc();
hole.setCenterX(centerX);
hole.setCenterY(centerY);
hole.setRadiusX(innerHoleRadius);
hole.setRadiusY(innerHoleRadius);
hole.setType(ArcType.ROUND);
hole.setFill(holeColor);
hole.setStartAngle(0);
hole.setLength(180);
this.getChildren().add(hole);
}
}
public static final class Data{
private String name;
private double value;
private Color color;
public Data(String name, double value) {
this(name,value,Color.color(Math.random(), Math.random(), Math.random()));
}
public Data(String name, double value, Color color) {
this.name = name;
this.value = value;
this.color = color;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getValue() {
return value;
}
public void setValue(double value) {
this.value = value;
}
public Color getColor() {
return color;
}
public void setColor(Color color) {
this.color = color;
}
}
}
Test.java
import java.util.ArrayList;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class Test extends Application{
@Override
public void start(Stage primaryStage) {
ArrayList<SemiCircleChart.Data> dataList = new ArrayList<SemiCircleChart.Data>();
dataList.add(new SemiCircleChart.Data("data1", 1, Color.RED));
dataList.add(new SemiCircleChart.Data("data2", 2, Color.GREEN));
dataList.add(new SemiCircleChart.Data("data3", 3, Color.BLUE));
SemiCircleChart chart = new SemiCircleChart(dataList, 500, 500, 500,100,2);
Pane pane = new Pane(chart);
Scene scene = new Scene(pane);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}