我正在使用滚动窗格,其中有一个 JPanel,它绘制了一个正方形网格,这些正方形网格是 [][] 数组中的对象。
如果数组是 [83][81] 大小为 18^2 的矩形,它看起来像:http: //i.imgur.com/fwJ9LV6.png (注意网格边缘的白色边框)
但是,[84][82] 处的相同矩形:http: //i.imgur.com/PZ2rNY3.png(最后一行被切片)。
现在,我已经:
- 将滚动窗格和 Jpanel 的首选大小和最大大小增加到远高于所需的大小。
- 检查 JPanel 是可滚动对象的视口。
它并没有改变任何东西。
我的 Jpanel 课程是:
package BlastRadius;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JPanel;
/**
* Canvas Class Stuart Bradley 25-1-2013 Contains the paint component
*/
public class BlastRadiusCanvas extends JPanel {
GridOfNodes grid = new GridOfNodes();
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
RenderingHints rh = g2d.getRenderingHints();
rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHints(rh);
//Draw space
int pixelsAcross = 32;
int pixelsDown = 0;
int size = 18;
for (int i = 0; i < grid.getRows(); i++) {
for (int j = 0; j < grid.getColumns(); j++) {
g2d.setColor(grid.getNodeGrid()[i][j].getColour());
g2d.fillRect(pixelsAcross, pixelsDown, size, size);
g2d.setColor(new Color(0, 0, 0));
g2d.drawRect(pixelsAcross, pixelsDown, size, size);
//Better Ovals maybe needed, try Ellipise2D class
if (grid.getNodeGrid()[i][j].getHasOval() == true) {
g2d.setColor(new Color(255, 255, 255));
g2d.fillOval((pixelsAcross + (size / 2) - 1), (pixelsDown + (size / 2) - 1), size / 4, size / 4);
}
pixelsAcross += 18;
}
pixelsDown += 18;
pixelsAcross = 32;
//Draws gene string for first object in each row
g2d.setColor(new Color(0, 0, 0));
g2d.drawString(grid.getNodeGrid()[i][0].getGeneString(), 5, pixelsDown - 5);
}
}
}
滚动窗格和相关的,如果需要可以发布整个 GUI 类:
jScrollPane1 = new javax.swing.JScrollPane();
jScrollPane1.setPreferredSize(new java.awt.Dimension(10000, 10000));
jScrollPane1.setViewportView(drawingJPanel);
//Grouping
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 254, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
);
虽然我之前通过 RAD 环境和手动完成了 GUI,但可滚动界面对我来说有点新奇!