下图显示了我的问题
我想做的是:
1) 先用鼠标左键单击 A 点
2) 鼠标左键第二次点击 B 点,现在出现从 A 到 B 的线
3) 按下鼠标左键并向右拖动时,假设 A 到 B 为 100%,以固定百分比距离绘制 5 条回撤线。
所以第 1 行绘制在 B 点 (0% AB ret),第 2 行是 25%(AB),第 3 行是 50%(AB),第 4 行是 75%(AB),第 5 行是 100%(AB) .
这是绘制线的代码
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.stage.Stage;
public class Lines extends Application {
Path path;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis yAxis = new NumberAxis(1, 11, 0.1);
yAxis.setTickUnit(1);
//yAxis.setPrefWidth(35);
yAxis.setMinorTickCount(10);
yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis) {
@Override
public String toString(Number object) {
String label;
label = String.format("%7.2f", object.floatValue());
return label;
}
});
final LineChart<String, Number> lineChart = new LineChart<String, Number>(xAxis, yAxis);
lineChart.setCreateSymbols(false);
lineChart.setAlternativeRowFillVisible(false);
lineChart.setLegendVisible(false);
XYChart.Series series1 = new XYChart.Series();
series1.getData().add(new XYChart.Data("Jan", 1.5));
series1.getData().add(new XYChart.Data("Feb", 4));
series1.getData().add(new XYChart.Data("Mar", 2.5));
series1.getData().add(new XYChart.Data("Apr", 5));
series1.getData().add(new XYChart.Data("May", 6));
series1.getData().add(new XYChart.Data("Jun", 10.5));
series1.getData().add(new XYChart.Data("Jul", 6));
series1.getData().add(new XYChart.Data("Aug", 7.5));
series1.getData().add(new XYChart.Data("Sep", 7.5));
series1.getData().add(new XYChart.Data("Oct", 6));
series1.getData().add(new XYChart.Data("Nov", 5.5));
series1.getData().add(new XYChart.Data("Dec", 4));
BorderPane bp = new BorderPane();
bp.setCenter(lineChart);
Scene scene = new Scene(bp, 800, 600);
lineChart.setAnimated(false);
lineChart.getData().addAll(series1);
Lines.MouseHandler mh = new Lines.MouseHandler( bp );
bp.setOnMouseClicked( mh );
bp.setOnMouseMoved( mh );
stage.setScene(scene);
path = new Path();
path.setStrokeWidth(1);
path.setStroke(Color.BLACK);
scene.setOnMouseDragged(mh);
scene.setOnMousePressed(mh);
bp.getChildren().add(path);
stage.setScene(scene);
stage.show();
}
class MouseHandler implements EventHandler< MouseEvent > {
private boolean gotFirst = false;
private Line line;
private Pane pane;
private double x1, y1, x2, y2;
public MouseHandler( Pane pane ) {
this.pane = pane;
}
@Override
public void handle( MouseEvent event ) {
if( event.getEventType() == MouseEvent.MOUSE_CLICKED ) {
if( !gotFirst ) {
x1 = x2 = event.getX();
y1 = y2 = event.getY();
line = new Line( x1, y1, x2, y2 );
pane.getChildren().add( line );
gotFirst = true;
}
else {
line = null;
gotFirst = false;
}
}
else {
if( line != null ) {
x2 = event.getX();
y2 = event.getY();
// update line
line.setEndX( x2 );
line.setEndY( y2 );
}
}
}
}
}
如何做到这一点?
谢谢!