java 如何在 JavaFX 2.0 中创建几何形状？
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How to create Geometric shapes in JavaFX 2.0?
提问by Valentin Vrinceanu
I have a project i am working on JavaFX 2.0, and it is a Drawing Application. I created so far a Pen, and a pen size slider, color picker, eraser and Undo functions. I do not know yet how to create basic Shapes like Rectangle, Circles or Polygons. The shapes must hape custom dimension and i need to draw them into my scene. Can anyone help me out?
我有一个项目正在开发 JavaFX 2.0，它是一个绘图应用程序。到目前为止，我创建了一个 Pen、一个笔大小滑块、颜色选择器、橡皮擦和撤消功能。我还不知道如何创建基本形状，如矩形、圆形或多边形。形状必须具有自定义尺寸，我需要将它们绘制到我的场景中。谁能帮我吗？
I would really appreciate any help.
我真的很感激任何帮助。
Thanks a lot!
非常感谢！
采纳答案by Uluk Biy
Check out the API Docs: javafx.scene.shape.Shape.
Sample usage: Draw Rectangle. Circle and Line examples also exist there.
查看 API 文档：javafx.scene.shape.Shape。
示例用法：绘制矩形。Circle 和 Line 示例也存在于此。
回答by valdow valdowb
public class MyCanvas extends Application {
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle(MyCanvas.class.getSimpleName());
Group root = new Group();
final Canvas canvas = new Canvas(300, 250);
GraphicsContext gc = canvas.getGraphicsContext2D();
drawShapes(gc);
final Text text = new Text("X = Y = ");
text.setTranslateX(100);
text.setTranslateY(40);
text.setFont(new Font(20));
canvas.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent t) {
text.setText("X = " + t.getX() + " Y = " + t.getY());
}
});
root.getChildren().addAll(canvas, text);
primaryStage.setScene(new Scene(root));
primaryStage.getScene().setFill(Color.AQUA);
primaryStage.show();
}
/**
* The main() method is ignored in correctly deployed JavaFX application.
* main() serves only as fallback in case the application can not be
* launched through deployment artifacts, e.g., in IDEs with limited FX
* support. NetBeans ignores main().
*
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
private void drawShapes(GraphicsContext gc) {
gc.setFill(Color.WHITESMOKE);
gc.fillRect(gc.getCanvas().getLayoutX(),
gc.getCanvas().getLayoutY(),
gc.getCanvas().getWidth(),
gc.getCanvas().getHeight());
gc.setFill(Color.GREEN);
gc.setStroke(Color.BLUE);
gc.setLineWidth(5);
gc.strokeLine(40, 10, 10, 40);
gc.fillOval(10, 60, 30, 30);
gc.strokeOval(60, 60, 30, 30);
gc.fillRoundRect(110, 60, 30, 30, 10, 10);
gc.strokeRoundRect(160, 60, 30, 30, 10, 10);
gc.fillArc(10, 110, 30, 30, 45, 240, ArcType.OPEN);
gc.fillArc(60, 110, 30, 30, 45, 240, ArcType.CHORD);
gc.strokeArc(10, 160, 30, 30, 45, 240, ArcType.OPEN);
}
}
}
回答by Andres Perez
You will need to get the graphic component of the component where you want to draw in.
您将需要获取要绘制的组件的图形组件。
if you have a panel it will be something like:
如果你有一个面板，它会是这样的：
Graphics g = jPanel1.getGraphics();
Graphics2D g2d = (Graphics2D)g;
Graphics2D offers you all the methods to draw what you are looking for. For a list off the completes methods check the docs at oracle:
Graphics2D 为您提供了绘制所需内容的所有方法。有关完整方法的列表，请查看 oracle 上的文档：
http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics2D.html
http://docs.oracle.com/javase/7/docs/api/java/awt/Graphics2D.html
Edit: Confused JavaSE. For JavaFX you can read a little how-to here: http://docs.oracle.com/javafx/1.3/howto/Shapes-Tutorial.html
编辑：困惑的 JavaSE。对于 JavaFX，您可以在此处阅读一些操作方法：http: //docs.oracle.com/javafx/1.3/howto/Shapes-Tutorial.html
