JavaFX Shear变换 - 芒果文档

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📜 JavaFX Shear变换

📅 最后修改于: 2020-10-14 01:53:25 🧑 作者: Mango

JavaFX剪切

剪切是一种改变对象相对于任何轴的倾斜度的变换。有两个剪切转换，分别是X剪切和Y剪切。 X剪切变形更改X坐标值，而Y剪切更改Y坐标值。

在两种剪切中，只有一个坐标会更改值，而另一坐标保持不变。下图显示了对其应用X剪切转换后的对象。矩形的y坐标保持不变，而X坐标移动了某个因子。

在JavaFX中，类javafx.scene.transform.Shear表示剪切转换。

物产

下表描述了该类的属性以及setter方法。

Property	Description	Setter Methods
pivotX	It is a double type property. It represents the X coordinate of the shear pivot point.	setPivotX(double value)
pivotY	It is a double type property. It represents the Y coordinate of the shear pivot point.	setPivotY(double value)
x	It is a double type property. It represents the multiplier by which the coordinates deviate in the positive X direction as the factor of their Y coordinate.	setX(double value)
y	It is a double type property. It represents the multiplier by which the coordinates deviate in the positive Y direction as the factor of their X coordinate.	setY(double value)

建设者

该类包含三个构造函数

public Shear()：使用默认参数创建一个新的Shear实例。
public Shear(double x，double y)：创建一个具有指定偏移坐标的新实例。枢轴坐标设置为(0,0)。
public Shear(double x，double y，double axisX，double shaftY)：使用指定的偏移坐标和枢轴坐标创建一个新实例。

例：

以下示例说明了剪切转换的实现。在这里，我们创建了三个矩形，分别用蓝色，深灰色和粉红色填充。深灰色矩形是原始矩形，蓝色矩形是X剪切的，粉红色矩形是Y剪切的。

package application;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.scene.transform.Shear;
import javafx.stage.Stage;
public class ShearExample extends Application{

@Override
public void start(Stage primaryStage) throws Exception {
// TODO Auto-generated method stub
// creating Rectangles 
Rectangle rect1 = new Rectangle(60,100,150,200);
Rectangle rect2 = new Rectangle(350,100,150,200);
Rectangle rect3 = new Rectangle(640,100,150,200);

//creating Text node just for the identification
Text text1 = new Text("After X shear");
Text text2 = new Text("Original ");
Text text3 = new Text("After Y shear");

//setting the positions and the fonts for the text nodes
text1.setX(70);
text1.setY(370);
text2.setX(380);
text2.setY(370);
text3.setX(640);
text3.setY(370);
text1.setFont(Font.font("calibri",FontWeight.BOLD,FontPosture.ITALIC,20));
text2.setFont(Font.font("calibri",FontWeight.BOLD,FontPosture.ITALIC,20));
text3.setFont(Font.font("calibri",FontWeight.BOLD,FontPosture.ITALIC,20));

//setting the color and stroke for the rectangles 
rect1.setFill(Color.BLUE);
rect1.setStroke(Color.BLACK);
rect2.setFill(Color.DARKGRAY);
rect2.setStroke(Color.BLACK);
rect3.setFill(Color.PINK);
rect3.setStroke(Color.BLACK);

//creating the shear transformation 
Shear shearX = new Shear();

// setting properties for the shear, the Y coordinate // needs to set to (0,0) for the X-shear transformation 
shearX.setPivotX(200); 
shearX.setPivotY(250);
shearX.setX(0.3); 
shearX.setY(0.0);
// applying the shear to first rectangle. 
rect1.getTransforms().add(shearX);

//creating the shear for third rectangle
Shear shearY = new Shear();

//setting the properties for shear, X coordinate needs // to be set to (0,0) in order to implement Y-shear
shearY.setPivotX(600);
shearY.setPivotY(80);
shearY.setX(0.0);
shearY.setY(0.2);

rect3.getTransforms().add(shearY);
Group root = new Group();
root.getChildren().addAll(rect1,rect2,rect3,text1,text2,text3);
Scene scene = new Scene(root,880,420);
primaryStage.setScene(scene);
primaryStage.setTitle("Shear Example");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}

}