相关疑难解决方法(0)

目标只是绘制一个位图,并在其顶部绘制消除位图底层区域的形状.

我创建了简单的概念证明代码,试图理解我应该如何去做.在这里的各种线程中,我发现了许多关于使用的提示:

android.graphics.PorterDuff.Mode.CLEAR

下面的代码只是创建一个蓝色背景的屏幕,并添加自定义视图.此视图在其画布上绘制粉红色背景,位图图像(带有轻微边框以显示粉红色背景),黄色覆盖圆圈表示每个PorterDuffXfermode.

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Paint.Style;
import android.graphics.PorterDuff.Mode;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.RelativeLayout;

public class Test extends Activity {
    Drawing d = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        RelativeLayout.LayoutParams rlp = null;

        // Create the view for the xfermode test
        d = new Drawing(this);
        rlp = new RelativeLayout.LayoutParams(600, 900);
        rlp.addRule(RelativeLayout.CENTER_IN_PARENT);
        d.setLayoutParams(rlp);

        RelativeLayout rl = new RelativeLayout(this); …

我正在尝试在OSX上创建一个带有Java的半透明窗口并添加一个JLabel.

这JLabel会每秒改变它的文字......

然而,该组件不能很好地重新粉刷.

我怎么解决这个问题？

我找到了这些 文章,但我无法弄清楚如何解决它.

如果可能的话,请粘贴修复源代码,这是我的:

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Font;
import java.util.Timer;
import java.util.TimerTask;

public class Translucent {
    public static void main( String [] args ) {

        JFrame frame = new JFrame();

        frame.setBackground( new Color( 0.0f,0.0f,0.0f,0.3f));

        final JLabel label =  new JLabel("Hola");
        label.setFont( new Font( label.getFont().getFamily(), Font.PLAIN, 46 ) );
        label.setForeground( Color.white );

        frame.add( label );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible( true );

        Timer timer = new …

在我的问题中,我有一个不透明的JPanel和另一个半透明(半透明)的JPanel,它位于第一个JPanel上.当我在顶部JPanel上添加单选按钮时.问题是每当我在每个单选按钮的标签区域上输入鼠标时(每次我将鼠标从标签上移开),它会变得越来越暗.

package trial;

import java.awt.Color;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class Test {

public static void main(String arg[]){
    JFrame rootframe = new JFrame("Test panel");
    rootframe.setSize(800, 550);
    rootframe.setExtendedState(JFrame.MAXIMIZED_BOTH);

    JPanel basePanel = new JPanel(); //fills rootFrame
    basePanel.setOpaque(true);
    basePanel.setBackground(Color.yellow );     

    JPanel panelContainingRadioButtons = new JPanel();//wraps radio buttons
    panelContainingRadioButtons.setOpaque(true);
    panelContainingRadioButtons.setBackground(new Color(0,0,0,100) );

    ButtonGroup buttonGroup1 = new ButtonGroup();

    JRadioButton jRadioButton1 = new JRadioButton();
    jRadioButton1.setText("Text A...............................");
    jRadioButton1.setOpaque(false);
    jRadioButton1.setForeground( Color.white);
    buttonGroup1.add(jRadioButton1);

    JRadioButton jRadioButton2 = new JRadioButton();
    jRadioButton2.setOpaque(false);
    jRadioButton2.setForeground( Color.white);
    buttonGroup1.add(jRadioButton2);
    jRadioButton2.setText("Text B.......................");

    JRadioButton …

我有多个透明BufferedImage实例,我想将它们叠加在一起(也就是Photoshop图层)并烘焙成一个BufferedImage输出.我该怎么做呢？

第一次在这里发帖 这个编程任务让我难过,代码如下:

import java.awt.*;
import javax.swing.*;

public class HTree extends JPanel {

private Color color = new Color((int)(Math.random() * 256), (int)(Math.random() * 256), (int)(Math.random() * 256));

public void draw(Graphics g, int n, double sz, double x, double y) {
    if (n == 0) return; 
    double x0 = x - sz/2, x1 = x + sz/2;
    double y0 = y - sz/2, y1 = y + sz/2;
    // draw the 3 line segments of the H  
    g.setColor(color);
    g.drawLine((int)x0, (int)y, (int)x1, (int)y); …

我正在JPanel上画一条蓝线

public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;

    super.paint(g2);

    if (path.size() >= 2) {
        BasisStroke stroke = new BasicStroke(Config.TILE_SIZE_IN_PIXEL / 3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
        g2.setStroke(stroke);
        g2.setPaint(Color.BLUE);
        g2.setPaintMode();

        for (int i = 0; i < path.size() - 1; i++) {
            g2.drawLine(path.get(i).x, path.get(i).y, path.get(i + 1).x, path.get(i + 1).y);
        }
    }
}

但我希望这条线是半透明的.我如何实现这一目标？