我已经用JavaFX创建了一个绘画程序。您所看到的所有代码都在一个BIG文件中。因此，我想创建一个名为Figure的超类，以使形状具有所有相同的东西。然后，我想为每个Line，Circle，Rectangle和Polygon创建子类，也许在每个类中都使用eventhandler来创建绘图方法，这可能吗？
这是我的代码：
package tegneprogram;
import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.ColorPicker;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.stage.Stage;
//------------------------------------------------------------------------------
// CONTROLFX MUST BE ADDED IN THE PROJECT LIBRARY TO SEE THE EFFECT
//------------------------------------------------------------------------------
import org.controlsfx.control.PopOver;
//---------------------------------------------------------------------------------------
// DESCRIPTION:
//
// A PROGRAM THAT ALLOWS THE USER TO DRAW GEOMETRIC FIGURES WITH DIFFERENT COLORS.
// YOU CAN ALSO ADD TEXT TO THE PANE. WHEN FIGURES AND TEXT IS APPLIED YOU CAN MOUSE_PRESS
// AND MOUSE_DRAG THEM INDIVIDUALLY AND MOVE EACH ONE AROUND THE PANE.
//
//------------------------------------------------------------------------------
public class Tegneprogram extends Application {
//------------------------------------------------------------------------------
// START
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// GEOMETRIC FIGURES
//------------------------------------------------------------------------------
Rectangle rect;
Line line;
Polygon poly;
Circle circ;
TextField text;
//------------------------------------------------------------------------------
// VARIABLES FOR DRAGGING FIGURES
//------------------------------------------------------------------------------
double nwPosX = 0, nwPosY = 0;
double TX = 0, TY = 0;
//------------------------------------------------------------------------------
// DRAWING PANE
//------------------------------------------------------------------------------
Pane pane;
//------------------------------------------------------------------------------
// COLORPICKER
//------------------------------------------------------------------------------
ColorPicker cpFill;
ColorPicker cpLine;
//------------------------------------------------------------------------------
// POLYGON VARIABLES, ARRAYLIST AND DOUBLE ARRAY
//------------------------------------------------------------------------------
int count = 0;
double x[] = new double[3];
double y[] = new double[3];
List<Double> values = new ArrayList();
//------------------------------------------------------------------------------
// SPACE
//------------------------------------------------------------------------------
@Override
public void start(Stage primaryStage) {
//------------------------------------------------------------------------------
// TOGGLE BUTTON FOR FIGURES
//------------------------------------------------------------------------------
ToggleButton linebtn = new ToggleButton("Line");
ToggleButton rectbtn = new ToggleButton("Rectangel");
ToggleButton circbtn = new ToggleButton("Circle");
ToggleButton polybtn = new ToggleButton("Polygon");
ToggleButton textbtn = new ToggleButton("Text");
//------------------------------------------------------------------------------
// LABELS FOR INFORMATION ABOUT COLOR
//------------------------------------------------------------------------------
Label line_color = new Label("Line Color");
Label fill_color = new Label("Fill Color");
//-----------------------------------------------------------------------------
// TABLE ARRAY FOR ALL THE TOGGLE BUTTONS
//-----------------------------------------------------------------------------
ToggleButton[] FigureTool = {linebtn, rectbtn, circbtn, polybtn, textbtn};
//------------------------------------------------------------------------------
// GROUP OBJECT FOR TOGGLEBUTTONS
//------------------------------------------------------------------------------
ToggleGroup tools = new ToggleGroup();
//------------------------------------------------------------------------------
// COUNTING ALL THE BUTTONS IN TABLE ARRAY AND GROUPS THEM IN A TOGGLEGROUP
//------------------------------------------------------------------------------
for(ToggleButton tool : FigureTool) {
tool.setMinWidth(90);//width on buttons
tool.setToggleGroup(tools);
tool.setCursor(Cursor.HAND);
}
//------------------------------------------------------------------------------
// COLORPICKER
//------------------------------------------------------------------------------
cpLine = new ColorPicker(Color.BLACK);
cpFill = new ColorPicker(Color.TRANSPARENT);
//------------------------------------------------------------------------------
// HBOX FOR PLACING BUTTONS
//------------------------------------------------------------------------------
HBox buttons = new HBox(10);
buttons.getChildren().addAll(linebtn, rectbtn, circbtn, polybtn, textbtn);
//------------------------------------------------------------------------------
// STYLING FOR HBOX BUTTONS
//------------------------------------------------------------------------------
buttons.setPadding(new Insets(5));
buttons.setStyle("-fx-background: #777");
buttons.setPrefWidth(90);
//------------------------------------------------------------------------------
// VBOX FOR PLACING LINE AND COLOR BUTTONS
//------------------------------------------------------------------------------
VBox colors = new VBox(10);
colors.getChildren().addAll(line_color,cpLine,fill_color, cpFill);
//------------------------------------------------------------------------------
// STYLING FOR VBOX COLORS BUTTONS
//------------------------------------------------------------------------------
colors.setPadding(new Insets(5));
colors.setStyle("-fx-background: #777");
//------------------------------------------------------------------------------
// SETTING UP DRAWING PANE
//------------------------------------------------------------------------------
pane = new Pane();
pane.setStyle("-fx-background-color: white");
//------------------------------------------------------------------------------
// MOUSE_DRAGGED LINE
//------------------------------------------------------------------------------
EventHandler<MouseEvent> lineMousePressed = (MouseEvent e) -> {
nwPosX = e.getSceneX();
nwPosY = e.getSceneY();
TX = ((Line)(e.getSource())).getTranslateX();
TY = ((Line)(e.getSource())).getTranslateY();
((Line)(e.getSource())).toFront();
};
EventHandler<MouseEvent> lineMoveDrag = (MouseEvent e) -> {
double newSetX = e.getSceneX() - nwPosX;
double newSetY = e.getSceneY() - nwPosY;
double NSX = TX + newSetX;
double NSY = TY + newSetY;
((Line)(e.getSource())).setTranslateX(NSX);
((Line)(e.getSource())).setTranslateY(NSY);
};
//------------------------------------------------------------------------------
// MOUSE_DRAGGED RECTANGLE
//------------------------------------------------------------------------------
EventHandler<MouseEvent> rectMousePressed = (MouseEvent e) -> {
nwPosX = e.getSceneX();
nwPosY = e.getSceneY();
TX = ((Rectangle)(e.getSource())).getTranslateX();
TY = ((Rectangle)(e.getSource())).getTranslateY();
((Rectangle)(e.getSource())).toFront();
};
EventHandler<MouseEvent> rectMoveDrag = (MouseEvent e) -> {
double newSetX = e.getSceneX() - nwPosX;
double newSetY = e.getSceneY() - nwPosY;
double NSX = TX + newSetX;
double NSY = TY + newSetY;
((Rectangle)(e.getSource())).setTranslateX(NSX);
((Rectangle)(e.getSource())).setTranslateY(NSY);
};
//------------------------------------------------------------------------------
// MOUSE_DRAGGED CIRCLE
//------------------------------------------------------------------------------
EventHandler<MouseEvent> circlMousePressed = (MouseEvent e) -> {
nwPosX = e.getSceneX();
nwPosY = e.getSceneY();
TX = ((Circle)(e.getSource())).getTranslateX();
TY = ((Circle)(e.getSource())).getTranslateY();
((Circle)(e.getSource())).toFront();
};
EventHandler<MouseEvent> circMoveDrag = (MouseEvent e) -> {
double NSX = e.getSceneX() - nwPosX;
double NSY = e.getSceneY() - nwPosY;
double newX = TX + NSX;
double newY = TY + NSY;
((Circle)(e.getSource())).setTranslateX(newX);
((Circle)(e.getSource())).setTranslateY(newY);
};
//------------------------------------------------------------------------------
// MOUSE_DRAGGED POLYGON
//------------------------------------------------------------------------------
EventHandler<MouseEvent> polyMousePressed = (MouseEvent e) -> {
nwPosX = e.getSceneX();
nwPosY = e.getSceneY();
TX = ((Polygon)(e.getSource())).getTranslateX();
TY = ((Polygon)(e.getSource())).getTranslateY();
((Polygon)(e.getSource())).toFront();
};
EventHandler<MouseEvent> polyMoveDrag = (MouseEvent e) -> {
double newSetX = e.getSceneX() - nwPosX;
double newSetY = e.getSceneY() - nwPosY;
double NSX = TX + newSetX;
double NSY = TY + newSetY;
((Polygon)(e.getSource())).setTranslateX(NSX);
((Polygon)(e.getSource())).setTranslateY(NSY);
};
//------------------------------------------------------------------------------
// MOUSE_DRAGGED TEXT
//------------------------------------------------------------------------------
EventHandler<MouseEvent> textMousePressed = (MouseEvent e) -> {
nwPosX = e.getSceneX();
nwPosY = e.getSceneY();
TX = ((TextField)(e.getSource())).getTranslateX();
TY = ((TextField)(e.getSource())).getTranslateY();
((TextField)(e.getSource())).toFront();
};
EventHandler<MouseEvent> textMoveDrag = (MouseEvent e) -> {
double newSetX = e.getSceneX() - nwPosX;
double newSetY = e.getSceneY() - nwPosY;
double NSX = TX + newSetX;
double NSY = TY + newSetY;
((TextField)(e.getSource())).setTranslateX(NSX);
((TextField)(e.getSource())).setTranslateY(NSY);
};
//------------------------------------------------------------------------------
// POPOVER PANELS FOR SIDE INFORMATION ON THE RIGHT
//------------------------------------------------------------------------------
String linjetype = "Straight line";
String rectangle = "Rectangle";
String circle = "Circle";
String poly1 = "Polygon";
String text1 = "TEXT";
Label line1 = new Label("\n"+linjetype+" ");
Label rect1 = new Label("\n"+rectangle+" ");
Label circ1 = new Label("\n"+circle+" ");
Label poly2 = new Label("\n"+poly1+" ");
Label text2 = new Label("\n"+text1+" ");
VBox vBox = new VBox(line1);
VBox vBox2 = new VBox(rect1);
VBox vBox3 = new VBox(circ1);
VBox vBox4 = new VBox(poly2);
VBox vBox5 = new VBox(text2);
PopOver popOver = new PopOver(vBox);
PopOver popOver2 = new PopOver(vBox2);
PopOver popOver3 = new PopOver(vBox3);
PopOver popOver4 = new PopOver(vBox4);
PopOver popOver5 = new PopOver(vBox5);
//------------------------------------------------------------------------------
// EVENTHANDLER: MOUSE_PRESSED LINE
//------------------------------------------------------------------------------
pane.addEventHandler(MouseEvent.MOUSE_PRESSED, e-> {
if(linebtn.isSelected()) {
popOver.show(pane);
line = new Line();
line.setStartX(e.getX());
line.setStartY(e.getY());
line.setStroke(cpFill.getValue());
line.setOnMousePressed(lineMousePressed);
line.setOnMouseDragged(lineMoveDrag);
pane.getChildren().add(line);
}
//------------------------------------------------------------------------------
// MOUSE_PRESSED RECTANGLE
//------------------------------------------------------------------------------
else if(rectbtn.isSelected()) {
popOver2.show(pane);
rect = new Rectangle();
rect.setX(e.getX());
rect.setY(e.getY());
rect.setStroke(cpLine.getValue());
rect.setFill(cpFill.getValue());
rect.setOnMousePressed(rectMousePressed);
rect.setOnMouseDragged(rectMoveDrag);
pane.getChildren().add(rect);
}
//------------------------------------------------------------------------------
// MOUSE_PRESSED CIRCLE
//------------------------------------------------------------------------------
else if(circbtn.isSelected()) {
popOver3.show(pane);
circ = new Circle();
circ.setStroke(cpLine.getValue());
circ.setFill(cpFill.getValue());
circ.setCenterY(e.getY());
circ.setCenterX(e.getX());
pane.getChildren().add(circ);
circ.setOnMousePressed(circlMousePressed);
circ.setOnMouseDragged(circMoveDrag);
}
//------------------------------------------------------------------------------
// MOUSE_PRESSED POLYGON
//------------------------------------------------------------------------------
else if(polybtn.isSelected()) {
popOver4.show(pane);
poly = new Polygon();
x[count] = e.getX();
y[count] = e.getY();
poly.setStroke(cpLine.getValue());
poly.setFill(cpFill.getValue());
poly.setOnMousePressed(polyMousePressed);
poly.setOnMouseDragged(polyMoveDrag);
pane.getChildren().add(poly);
}
//------------------------------------------------------------------------------
// MOUSE_PRESSED TEXTFIELD
//------------------------------------------------------------------------------
else if(textbtn.isSelected()){
popOver5.show(pane);
text = new TextField();
text.setFont(Font.font("Verdana", 30));
text.setOnMousePressed(textMousePressed);
text.setOnMouseDragged(textMoveDrag);
text.toFront();
pane.getChildren().add(text);
}
});
//------------------------------------------------------------------------------
// EVENTHANDLER: MOUSE_RELEASED RECTANGLE
//------------------------------------------------------------------------------
pane.addEventHandler(MouseEvent.MOUSE_RELEASED, e-> {
if(rectbtn.isSelected()) {
rect.setWidth(e.getX() - rect.getX());
rect.setHeight(e.getY() - rect.getY());
}
//------------------------------------------------------------------------------
// MOUSE_RELEASED LINE
//------------------------------------------------------------------------------
else if(linebtn.isSelected()) {
line.setEndX(e.getX());
line.setEndY(e.getY());
}
//------------------------------------------------------------------------------
// MOUSE_RELEASED CIRCLE
//------------------------------------------------------------------------------
else if(circbtn.isSelected()) {
//Math.abs gives exact value of the radius
circ.setRadius(Math.abs(e.getX() - circ.getCenterX()) + Math.abs(e.getY() - circ.getCenterY()) / 2);
}
//------------------------------------------------------------------------------
// MOUSE_RELEASED POLYGON
//------------------------------------------------------------------------------
else if(polybtn.isSelected()) {
values.add(x[count]);
values.add(y[count]);
count++;
poly.getPoints().addAll(values);
}
});
//------------------------------------------------------------------------------
// STAGE AND SCENE
//------------------------------------------------------------------------------
BorderPane pane1 = new BorderPane();
pane1.setTop(buttons);
pane1.setRight(colors);
pane1.setCenter(pane);
Scene scene = new Scene(pane1, 800, 450);
primaryStage.setTitle("Tegneprogram");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
//------------------------------------------------------------------------------
// END
//------------------------------------------------------------------------------
所以在我看来，我认为Figure超类将是这样的，您这里拥有所有对象实例以及形状的颜色，等等：
public class Figur {
Rectangle rect;
Line line;
Polygon poly;
Circle circ;
TextField text;
ColorPicker cpFill;
ColorPicker cpLine;
}
然后设置所有事件处理程序以在单独的子类中绘制图形。那有可能吗，我将如何将它们连接在一起？
Line子类可以是类似的东西，可以使用“ createdLine”方法绘制线条。其他形状也是如此。
public class Line extends Figur {
public void createLine(){
popOver.show(pane);
super(line);
line.setStartX(e.getX());
line.setStartY(e.getY());
line.setStroke(cpFill.getValue());
line.setOnMousePressed(lineMousePressed);
line.setOnMouseDragged(lineMoveDrag);
pane.getChildren().add(line);
}
}
以及结束行的绘制方法：
public void endLine(){
line.setEndX(e.getX());
line.setEndY(e.getY());
}
}
答案 0 :(得分：0)
您可能想将Figur（我想是您想要的这个拼写错误的版本）声明为仅包含以下成员的抽象类：cpFill，cpLine，{{1 }}，mousePressedHandler和一个构造函数，该构造函数接收mouseDraggedHandler和cpFill的参数。然后，对于每个子类，您需要声明其中包含的形状对象以及定义cpLine和mousePressedHandler的构造函数。
编辑：代码示例可以更好地证明我上面所述的内容
mouseDraggedHandler注意：既然我已经编写了代码，我意识到您不必在抽象类中声明public abstract class Figure {
private ColorPicker cpFill;
private ColorPicker cpLine;
private EventHandler<MouseEvent> mousePressedHandler;
private EventHandler<MouseEvent> mouseDraggedHandler;
public Figur(ColorPicker cpFill, ColorPicker cpLine) {
this.cpFill = cpFill;
this.cpLine = cpLine;
}
}
public class MyRectangle extends Figure {
private Rectangle rect;
public MyRectangle(ColorPicker cpFill, ColorPicker cpLine) {
super(cpFill, cpLine);
mousePressedHandler = e -> {
// do something with your rectangle here
}
mouseDraggedHandler = e -> {
// do another thing with your rectangle here
}
rect.setOnMousePressed(mousePressedHandler);
rect.setOnMouseDragged(mouseDraggedHandler);
}
}
public class MyLine extends Figure {
private Line line;
public MyRectangle(ColorPicker cpFill, ColorPicker cpLine) {
super(cpFill, cpLine);
mousePressedHandler = e -> {
// do something with your line here
}
mouseDraggedHandler = e -> {
// do another thing with your line here
}
line.setOnMousePressed(mousePressedHandler);
line.setOnMouseDragged(mouseDraggedHandler);
}
}
和mousePressedHandler。但是，我仍然将它们保留在此处，以使事情更加清楚。随时删除它们，只需致电
mouseDraggedHandler代替