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控制画布绘制操作的方法

有一些方法可以控制绘制画布绘制操作的属性：

样本用法

该程序使用的源图像是：

import javafx.application.Application;

import javafx.scene.*;

import javafx.scene.canvas.*;

import javafx.scene.effect.*;

import javafx.scene.image.Image;

import javafx.scene.paint.*;

import javafx.stage.Stage;

public class CanvasEffects extends Application {

@Override

public void start(Stage stage) {

final Image image = new Image(IMAGE_LOC);

final int NUM_IMGS = 5;

final double W = image.getWidth();

final double H = image.getWidth();

final Canvas canvas = new Canvas(W * NUM_IMGS, H);

final GraphicsContext gc = canvas.getGraphicsContext2D();

gc.setFill(Color.GOLD);

gc.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());

gc.setGlobalBlendMode(BlendMode.SCREEN);

for (int i = 0 ; i < NUM_IMGS; i++) {

final double opacity = 1 - ((double) i) / NUM_IMGS;

System.out.println(opacity);

gc.setGlobalAlpha(opacity);

gc.setEffect(new BoxBlur(i * 2, i * 2, 3));

gc.drawImage(image, i * W, 0);

}

stage.setScene(new Scene(new Group(canvas)));

stage.show();

}

public static void main(String[] args) {

launch(args);

}

// icon license: Linkware (Backlink to http://uiconstock.com required) commercial usage not allowed.

private static final String IMAGE_LOC = "http://icons.iconarchive.com/icons/uiconstock/flat-halloween/128/Halloween-Bat-icon.png";

}