我正在尝试在 JavaFX 中使用 XYChart 在 X 轴上显示日期。
@FXML
private LineChart<Number, Number> grafico;
@FXML
private NumberAxis eixoy;
@FXML
private NumberAxis eixox;
我需要显示不同的N系列并在X轴上按日期对它们进行排序。我做了很多研究，并决定使用 NumberAxis，将日期转换为 int。
但是显示效果并不令人愉快:
我可以使用哪些类型的属性和方法来使我的图表更具可读性？
这是我的 FXML 代码:
<?xml version="1.0" encoding="UTF-8"?>
<?import com.jfoenix.controls.JFXButton?>
<?import de.jensd.fx.glyphs.fontawesome.FontAwesomeIconView?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.LineChart?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.chart.ValueAxis?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.DatePicker?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<VBox maxHeight="10000.0" maxWidth="10000.0" prefHeight="960.0" prefWidth="1600.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Controller.GraficosController">
<children>
<GridPane maxHeight="50.0" minHeight="50.0" prefWidth="1600.0" style="-fx-background-color: #0a80a7;">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label text="Indicadores" textFill="WHITE">
<graphic>
<FontAwesomeIconView fill="WHITE" glyphName="LINE_CHART" size="40" wrappingWidth="55.0" />
</graphic>
<font>
<Font size="40.0" />
</font>
<GridPane.margin>
<Insets left="15.0" />
</GridPane.margin>
</Label>
</children>
</GridPane>
<GridPane maxHeight="112.0" minHeight="112.0" prefHeight="20.0" VBox.vgrow="SOMETIMES">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints />
<RowConstraints maxHeight="26.0" minHeight="26.0" prefHeight="26.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="30.0" minHeight="30.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="26.0" minHeight="26.0" prefHeight="26.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="30.0" minHeight="30.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<VBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</VBox.margin>
<children>
<Label minHeight="26.0" prefHeight="26.0" text="Ano" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<ComboBox fx:id="cbxAno" minHeight="25.0" onAction="#anoMudou" prefHeight="25.0" prefWidth="200.0" promptText="Selecionar..." GridPane.rowIndex="2" />
<Label minHeight="26.0" prefHeight="26.0" text="Turma" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<ComboBox fx:id="cbxTurma" minHeight="25.0" onAction="#turmaMudou" prefHeight="25.0" prefWidth="200.0" promptText="Selecionar..." GridPane.columnIndex="1" GridPane.rowIndex="2" />
<Label fx:id="lblAluno" minHeight="26.0" prefHeight="26.0" text="Aluno" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<ComboBox fx:id="cbxAluno" minHeight="25.0" onAction="#alunoMudou" prefHeight="25.0" prefWidth="200.0" promptText="Selecionar..." GridPane.rowIndex="4" />
<Label minHeight="26.0" prefHeight="26.0" text="Data Início" GridPane.columnIndex="2" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<DatePicker fx:id="dataInicio" minHeight="25.0" onAction="#acaoDataInicio" GridPane.columnIndex="2" GridPane.rowIndex="2" />
<Label minHeight="26.0" prefHeight="26.0" text="Data Fim" GridPane.columnIndex="2" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<DatePicker fx:id="dataFim" minHeight="25.0" onAction="#acaoDataFim" GridPane.columnIndex="2" GridPane.rowIndex="4" />
<Label fx:id="lblCriterio" minHeight="26.0" prefHeight="26.0" text="Critério" GridPane.columnIndex="1" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="20.0" />
</font>
</Label>
<ComboBox fx:id="cbxCriterio" minHeight="25.0" onAction="#criterioMudou" prefHeight="25.0" prefWidth="200.0" promptText="Selecionar..." GridPane.columnIndex="1" GridPane.rowIndex="4" />
</children>
</GridPane>
<GridPane fx:id="paneGrid" hgap="1.0" prefHeight="500.0" vgap="1.0" VBox.vgrow="ALWAYS">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="1000.0" minWidth="250.0" percentWidth="80.0" prefWidth="1000.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="792.0" minWidth="10.0" prefWidth="462.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<LineChart fx:id="grafico" animated="true" GridPane.hgrow="ALWAYS" GridPane.vgrow="ALWAYS">
<xAxis>
<NumberAxis fx:id="eixox" animated="false" side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis fx:id="eixoy" side="LEFT" upperBound="10.0" />
</yAxis>
</LineChart>
<VBox alignment="TOP_CENTER" prefHeight="200.0" prefWidth="100.0" GridPane.columnIndex="1">
<children>
<TableView fx:id="tableDisciplinas" onMouseClicked="#onMouseClicked" onMouseEntered="#onMousePressed" onMouseExited="#onMouseReleased" VBox.vgrow="ALWAYS">
<columns>
<TableColumn fx:id="col_disciplinas" prefWidth="75.0" style="-fx-alignment: CENTER;" text="Disciplinas" />
</columns>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
<VBox.margin>
<Insets bottom="20.0" />
</VBox.margin>
</TableView>
<JFXButton fx:id="btnGerarGraficos" onAction="#gerarGraficos" style="-fx-background-color: #0d536b;" text="Gerar Gráfico" textFill="WHITE">
<font>
<Font name="System Bold" size="21.0" />
</font>
<graphic>
<FontAwesomeIconView fill="WHITE" glyphName="LINE_CHART" />
</graphic>
<VBox.margin>
<Insets bottom="5.0" top="5.0" />
</VBox.margin>
</JFXButton>
</children>
</VBox>
</children>
<VBox.margin>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</VBox.margin>
</GridPane>
</children>
</VBox>
最佳答案
您正在搜索的函数是NumberAxis.setTickLabelFormatter()
axis.setTickLabelFormatter(new StringConverter<Number>() {
private SimpleDateFormat format = new SimpleDateFormat("dd.MM HH:mm");
@Override
public String toString(Number object) {
return format.format(new Date((long) object));
}
@Override
public Number fromString(String string) {
// TODO
return null;
}
});
关于java - 如何设置 JavaFX XYChart 中节点之间的间隙，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59010870/