[英]Swing - irregular shaped border
I'm newbie in the swing and have a question how better to draw this shape: 我是秋千上的新手,有一个问题,如何更好地绘制这个形状:
I thought in two ways 我想到了两个方面
Please advise and an examples will be highly appreciated! 请指教,我们将非常感谢您的示例!
you can use the polygon class ( java.awt.Polygon
) 你可以使用polygon类( java.awt.Polygon
)
int xs = new int[]{1,2,3...7}; //your x-coordinates
int ys = new int[]{1,2,3...7}; //your y-coordinates
Shape irr = new Polygon(xs, ys, xs.length);
if you want to use certain borders you can use Graphics2D
如果你想使用某些边框,你可以使用Graphics2D
public void paintComponent(Graphics gr){
Graphics2D g2d = (Graphics2D)gr;
GradientPaint redToWhite = new GradientPaint(0,0,color.RED,100, 0,color.WHITE);
g2d.setPaint(redtowhite)
g2d.fill(irr); //fill special color
Stroke customBorder = getCustomBorder();
g2d.setStroke(customBorder);
g2d.draw(irr); //draw 'special' borders
}
have a look at stroke and fill 看看中风和填充
note that Polygon
implements the contains(double x, double y)
method which lets you detect if you're inside or not 请注意, Polygon
实现了contains(double x, double y)
方法,该方法可以让您检测是否在内部
You could use a Area
for example... 例如,您可以使用Area
...
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Area area = new Area(new Rectangle(10, 10, getWidth() - 20, getHeight() - 20));
area.subtract(new Area(new Rectangle(20, getHeight() / 2, getWidth() / 2, getHeight() - 10)));
g2d.draw(area);
g2d.dispose();
}
}
You define a custom shape... 您定义自定义形状...
public class TestPane extends JPanel {
public TestPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Path2D path = new Path2D.Float();
path.moveTo(10, 10);
path.lineTo(getWidth() - 20, 10);
path.lineTo(getWidth() - 20, getHeight() - 20);
path.lineTo(getWidth() / 2, getHeight() - 20);
path.lineTo(getWidth() / 2, getHeight() / 2);
path.lineTo(20, getHeight() / 2);
path.lineTo(20, getHeight() - 20);
path.lineTo(10, getHeight() - 20);
path.closePath();
g2d.draw(path);
g2d.dispose();
}
}
Actually writing a custom border would be very, very difficult, because of the irregular style of shape, where would the components actually be contained? 实际上写一个自定义边框会非常非常困难,因为形状不规则,组件实际上会被包含在哪里?
It might be possible to create two or more borders, which could then be laid out so that the appeared as one 有可能创建两个或更多边框,然后可以将其布局为使其显示为一个边框
See Working with Geometry for more details 有关详细信息,请参阅使用几何
Border
example... 更新了Border
示例... Getting a Border
to actually work is far more difficult, as the expectation is that the internal area of the border will be rectangular. 让Border
实际工作要困难得多,因为期望边界的内部区域是矩形的。
Based on the complex shape you've provided, one solution would be to actually create two borders, a left and right borer, which take care of generating a "safe" area for components to be laid out within, for example: 基于您提供的复杂形状,一种解决方案是实际创建两个边框,一个左右镗孔,它们负责为要在其中布置的组件生成“安全”区域,例如:
public class LeftBorder implements Border {
private int offset;
public LeftBorder(int offset) {
this.offset = offset;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Path2D path = new Path2D.Float();
int xOffset = x + offset;
int yOffset = y + offset;
width -= offset;
height -= offset * 2;
float gap = width * 0.1f;
path.moveTo(xOffset, yOffset);
path.lineTo(xOffset + width, yOffset);
path.moveTo(xOffset, yOffset);
path.lineTo(xOffset, yOffset + height);
path.lineTo(xOffset + gap, yOffset + height);
path.lineTo(xOffset + gap, yOffset + (height - (height / 2)));
path.lineTo(xOffset + width, yOffset + (height - (height / 2)));
((Graphics2D)g).draw(path);
}
@Override
public Insets getBorderInsets(Component c) {
int height = c.getHeight();
height -= (height / 2);
System.out.println(height);
return new Insets(offset + 4, offset + 4, height + 4, 0);
}
@Override
public boolean isBorderOpaque() {
return false;
}
}
public class RightBorder implements Border {
private int offset;
public RightBorder(int offset) {
this.offset = offset;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Path2D path = new Path2D.Float();
int xOffset = x;
int yOffset = y + offset;
width -= offset;
height -= offset * 2;
path.moveTo(xOffset, yOffset);
path.lineTo(xOffset + width, yOffset);
path.lineTo(xOffset + width, yOffset + height);
path.lineTo(xOffset, yOffset + height);
path.lineTo(xOffset, yOffset + (height - (height / 2)));
((Graphics2D)g).draw(path);
}
@Override
public Insets getBorderInsets(Component c) {
return new Insets(offset + 4, 0, offset + 4, offset + 4);
}
@Override
public boolean isBorderOpaque() {
return false;
}
}
This would then require you to provide at least two panels of equal height, for example: 这将要求您提供至少两个高度相等的面板,例如:
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.geom.Path2D;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
public class Main {
public static void main(String args[]) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(new LeftPane());
frame.add(new RightPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class RightPane extends JPanel {
public RightPane() {
setBorder(new RightBorder(10));
setLayout(new GridBagLayout());
add(new JLabel("Righty"));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
public class LeftPane extends JPanel {
public LeftPane() {
setBorder(new LeftBorder(10));
setLayout(new GridBagLayout());
add(new JLabel("Lefty"));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
This will also be relient on the layout manager been able to layout the two components next to each other 这也将使布局管理器能够将两个组件布置在彼此旁边
Take a look at the Java 2D API . 看一下Java 2D API 。 It helps you to draw complex shapes. 它可以帮助您绘制复杂的形状。
Eg 例如
class IrregularShape extends JComponent {
private int strokeWidth;
IrregularShape(int strokeWidth){
this.strokeWidth = strokeWidth;
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D newGraphics = (Graphics2D) g.create();
Insets borderInsets = new Insets(0, 0, 0, 0);
Border border = getBorder();
if (border != null) {
borderInsets = border.getBorderInsets(this);
}
BasicStroke basicStroke = new BasicStroke(strokeWidth);
newGraphics.setStroke(basicStroke);
int x = getX() + borderInsets.left + strokeWidth;
int y = getY() + borderInsets.top + strokeWidth;
int width = getWidth() - x - borderInsets.right - strokeWidth;
int height = getHeight() - y - borderInsets.bottom - strokeWidth;
Double outterRactangleDouble = new Rectangle2D.Double(x, y, width, height);
Area outterRectangle = new Area(outterRactangleDouble);
Area innerRectangle = new Area(outterRactangleDouble);
AffineTransform affineTransform = new AffineTransform();
affineTransform.scale(0.5, 0.5);
affineTransform.translate(x + width * 0.10, y + height * 1.2);
innerRectangle.transform(affineTransform);
outterRectangle.subtract(innerRectangle);
newGraphics.draw(outterRectangle);
}
}
public class MainFrame {
public static void main(String[] args) {
JFrame frame = new JFrame("Irregular Shape");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container contentPane = frame.getContentPane();
contentPane.add(new IrregularShape(3));
frame.setSize(640, 150);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
and it's also resizeable 它也可以调整大小
In addition to my first answer https://stackoverflow.com/a/34287251/974186 除了我的第一个答案https://stackoverflow.com/a/34287251/974186
You can also implement it as a Border. 您也可以将其实现为边框。
class IrregularBorder implements Border {
private int thickness;
public IrregularBorder(int thickness) {
this.thickness = thickness;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width,
int height) {
Graphics2D graphics2d = (Graphics2D) g;
BasicStroke basicStroke = new BasicStroke(thickness);
graphics2d.setStroke(basicStroke);
int halfThickness = thickness / 2;
Double outterRactangleDouble = new Rectangle2D.Double(
x + halfThickness, y + halfThickness, width - thickness,
height - thickness);
Area outterRectangle = new Area(outterRactangleDouble);
Area innerRectangle = computeInnerRect(x, y, width, height,
outterRactangleDouble);
outterRectangle.subtract(innerRectangle);
graphics2d.draw(outterRectangle);
}
private Area computeInnerRect(int x, int y, int width, int height,
Double outterRactangleDouble) {
Area innerRectangle = new Area(outterRactangleDouble);
AffineTransform affineTransform = new AffineTransform();
affineTransform.scale(0.5, 0.5);
affineTransform.translate(x + width * 0.10, y + height * 1.2);
innerRectangle.transform(affineTransform);
return innerRectangle;
}
@Override
public Insets getBorderInsets(Component c) {
int left = (int) (thickness + (c.getWidth() * 0.6));
return new Insets(thickness, left, thickness, thickness);
}
@Override
public boolean isBorderOpaque() {
return true;
}
}
and use it as usual 像往常一样使用它
public class MainFrame {
public static void main(String[] args) {
JFrame frame = new JFrame("Irregular Shape");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container contentPane = frame.getContentPane();
JPanel mainPanel = new JPanel(new BorderLayout());
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.add(mainPanel);
JPanel irregularShapeBorderedPanel = new JPanel(new BorderLayout());
irregularShapeBorderedPanel.add(new JButton("Button"),
BorderLayout.CENTER);
irregularShapeBorderedPanel.setBorder(new IrregularBorder(2));
mainPanel.add(irregularShapeBorderedPanel);
frame.setSize(640, 150);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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