java JavaFX |线性渐变类

JavaFX |线性渐变类

原文:https://www.geeksforgeeks.org/javafx-lineargradient-class/

LinearGradient 类是 JavaFX 的一部分。线性渐变类用线性颜色渐变图案填充形状。用户可以指定一个以上的线性渐变模式，系统将提供颜色之间的插值。

类的构造函数:

LinearGradient(double sX，double sY，double eX，double eY，布尔 prop，CycleMethod c，List s) :创建一个新的 LinearGradient 对象。
线性渐变(double sX，double sY，double eX，double eY，布尔 prop，CycleMethod c，Stop… s) :创建一个新的线性渐变对象。

常用方法:

方法	说明
等于(对象 0)	返回线性渐变对象是否相等。
getCycleMethod()	返回线性渐变对象的循环方法。
getEndX()	返回线性渐变端点的 x 坐标。
getEndY()	返回线性渐变终点的 y 坐标。
getStartX()	返回线性渐变起点的 x 坐标。
getStartY()	返回线性渐变起点的 y 坐标。
getStops()	返回线性渐变的停止点。
异戊二烯()	返回线性渐变是否不透明。
isProportional()	返回线性渐变是否成比例。
valueOf(字符串 v)	从字符串表示形式创建线性渐变值。

下面的程序说明了线性渐变类的使用:

Java program to create a LinearGradient object and add stops to it and apply it to the circle: In this program we will create an array of Stop objects with their offset values ranging from 0 to 1. Create a LinearGradient object with specified stops. Now create a circle with specified x, y positions, and radius and add the linear gradient to it. Then create a VBox and set the alignment of it. Add the circle to the vbox and add the vbox to the scene and add the scene to the stage and call the show() function to display the results.

```java // Java program to create a LinearGradient // object and add stops to it and apply it // to the circle import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.scene.layout.; import javafx.scene.paint.; import javafx.scene.text.; import javafx.geometry.; import javafx.scene.layout.; import javafx.scene.shape.; import javafx.scene.paint.*;

public class Linear_Gradient_1 extends Application {

// launch the application public void start(Stage stage) {

try {

// set title for the stage         stage.setTitle("Linear Gradient");

// create stops         Stop[] stop = {new Stop(0, Color.RED),                        new Stop(0.5, Color.GREEN),                        new Stop(1, Color.BLUE)};

// create a Linear gradient object         LinearGradient linear_gradient = new LinearGradient(0, 0,                           1, 0, true, CycleMethod.NO_CYCLE, stop);

// create a circle         Circle circle = new Circle(100, 100, 70);

// set fill         circle.setFill(linear_gradient);

// create VBox         VBox vbox = new VBox(circle);

// ste Alignment         vbox.setAlignment(Pos.CENTER);

// create a scene         Scene scene = new Scene(vbox, 400, 300);

// set the scene         stage.setScene(scene);

stage.show();     }

catch (Exception e) {

System.out.println(e.getMessage());     } }

// Main Method public static void main(String args[]) {

// launch the application     launch(args); } } ```

输出:
Java program to create a LinearGradient object and add stops to it and set the CycleMethod to reflect and set proportional to false and apply it to the circle: In this program we will create an array of Stop objects with their offset values ranging from 0 to 1. Then create a LinearGradient object with specified stops. Set the CycleMethod to reflect and set proportional to false. Create a circle with specified x, y positions, and radius and add the linear gradient to it. Then create a VBox and set the alignment of it. Add the circle to the vbox and add the vbox to the scene and add the scene to the stage and call the show() function to display the results.

```java // Java program to create a LinearGradient object // and add stops to it and set the CycleMethod to // reflect and set proportional to false and // apply it to the circle import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.; import javafx.scene.layout.; import javafx.stage.Stage; import javafx.scene.layout.; import javafx.scene.paint.; import javafx.scene.text.; import javafx.geometry.; import javafx.scene.layout.; import javafx.scene.shape.; import javafx.scene.paint.*;

public class Linear_Gradient_2 extends Application {

// launch the application     public void start(Stage stage)     {

try {

// set title for the stage             stage.setTitle("Linear Gradient");

// create stops             Stop[] stop = {new Stop(0, Color.RED), new Stop(0.5,                          Color.GREEN), new Stop(1, Color.BLUE)};

// create a Linear gradient object             LinearGradient linear_gradient = new LinearGradient(0, 0,                             35, 0, false, CycleMethod.REFLECT, stop);

// create a circle             Circle circle = new Circle(100, 100, 70);

// set fill             circle.setFill(linear_gradient);

// create VBox             VBox vbox = new VBox(circle);

// ste Alignment             vbox.setAlignment(Pos.CENTER);

// create a scene             Scene scene = new Scene(vbox, 400, 300);

// set the scene             stage.setScene(scene);

stage.show();         }

catch (Exception e) {

System.out.println(e.getMessage());         }     }

// Main Method     public static void main(String args[])     {

// launch the application         launch(args);     } } ```

输出: