Java图形绘制自定义循环 [英] Java Graphics Drawing Custom Circular
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问题描述
我想在中心处绘制一个形状，从面板中心开始，并继续以圆形展开，如下图所示：
https://www.dropbox.com/s/lnxi1be8uogn2zx/20140320_124537.jpg
p>但我在中心形状方面有困难，就好像它根本不在面板上显示。这里是我为这些形状写的类。
package graphics.test;
import java.awt.Graphics;
import javax.swing.JPanel;
public class DrawPanel extends JPanel {
public void paintComponent（Graphics g）{
super.paintComponent（g）;
int width = getWidth（）;
int height = getHeight（）;
//右上角
g.drawLine（0，0，width / 4，height / 6）;
g.drawLine（0，0，width / 4，height / 4）;
g.drawLine（0，0，width / 4，height / 3）;
//左上角
g.drawLine（宽度，0，宽度 - 宽度/ 4，高度/ 6）;
g.drawLine（width，0，width - width / 4，height / 4）;
g.drawLine（width，0，width - width / 4，height / 3）;
//左下角
g.drawLine（width，height，width - width / 3，height - height / 6）;
g.drawLine（width，height，width - width / 4，height - height / 4）;
g.drawLine（width，height，width - width / 4，height - height / 3）;
//右下角
g.drawLine（0，height，width / 3，height - height / 6）;
g.drawLine（0，height，width / 4，height - height / 4）;
g.drawLine（0，height，width / 4，height - height / 3）;
// center
$ b $ for（int i = width / 2; i< width / 3; i--）
{
for（int j = height / 2; j
g.drawLine（i，j，i，j）;
}
}
}
<这看起来像一个阿基米德螺旋（ http://en.wikipedia.org/wiki/Archimedean_spiral ）
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Path2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
导入javax.swing.SwingUtilities;
public class SpiralDrawPanelTest
{
public static void main（String [] args）
{
SwingUtilities.invokeLater（new Runnable（）
{
@Override
public void run（）
{
createAndShowGUI（）;
}
}）;
private static void createAndShowGUI（）
{
JFrame f = new JFrame（）;
f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
f.getContentPane（）。setLayout（new BorderLayout（））;
f.getContentPane（）。add（新的SpiralDrawPanel（），BorderLayout.CENTER）;
f.setSize（800，800）;
f.setLocationRelativeTo（null）;
f.setVisible（true）;
class SpiralDrawPanel扩展了JPanel {
$ b @Override
public void paintComponent（Graphics gr）
{
super.paintComponent（gr）;
Graphics2D g =（Graphics2D）gr;
AffineTransform at =
AffineTransform.getTranslateInstance（
getWidth（）/ 2，getHeight（）/ 2）;
BasicStroke stroke =
new BasicStroke（1.0f，
BasicStroke.CAP_BUTT，
BasicStroke.JOIN_MITER，
10.0f，new float [] {10.0 f}，0.0f）;
g.setStroke（stroke）;
形状=
at.createTransformedShape（
createArchimedeanSpiral（Math.PI * 10，10，250））;
g.draw（shape）;
}
private static Shape createArchimedeanSpiral（
double totalAngleRad，double alpha，int steps）
{
Path2D path = new Path2D。双（）;
path.moveTo（0，0）;
double angleDeltaRad = totalAngleRad / steps;
for（int i = 0; i <= steps; i ++）
{
double angleRad = i * angleDeltaRad;
double x = Math.sin（angleRad）* alpha * angleRad;
double y = Math.cos（angleRad）* alpha * angleRad;
path.lineTo（x，y）;
}
返回路径;
$ b $ / code $ / pre
编辑评论。
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.geom.Path2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
导入javax.swing.SwingUtilities;
public class SpiralDrawPanelTest
{
public static void main（String [] args）
{
SwingUtilities.invokeLater（new Runnable（）
{
@Override
public void run（）
{
createAndShowGUI（）;
}
}）;
private static void createAndShowGUI（）
{
JFrame f = new JFrame（）;
f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
f.getContentPane（）。setLayout（new BorderLayout（））;
f.getContentPane（）。add（新的SpiralDrawPanel（），BorderLayout.CENTER）;
f.setSize（800，800）;
f.setLocationRelativeTo（null）;
f.setVisible（true）;
class SpiralDrawPanel扩展JPanel {
$ b @覆盖
public void paintComponent（Graphics g）
{
super.paintComponent（g）;
paintArchimedeanSpiral（g，getWidth（）/ 2，getHeight（）/ 2，Math.PI * 10,10,250）;
}
private static void paintArchimedeanSpiral（
Graphics g，
double centerX，double centerY，
double totalAngleRad，double alpha，int steps）
{
Path2D path = new Path2D.Double（）;
path.moveTo（0，0）;
double angleDeltaRad = totalAngleRad / steps;
for（int i = 0; i <= steps; i + = 2）
{
double angleRad0 = i * angleDeltaRad;
double angleRad1 = i * angleDeltaRad + angleDeltaRad;
double x0 = centerX + Math.sin（angleRad0）* alpha * angleRad0;
double y0 = centerY + Math.cos（angleRad0）* alpha * angleRad0;
double x1 = centerX + Math.sin（angleRad1）* alpha * angleRad1;
double y1 = centerY + Math.cos（angleRad1）* alpha * angleRad1;
g.drawLine（（int）x0，（int）y0，（int）x1，（int）y1）;
}
}
}
I want to draw a shape at center that starts from the center of the panel and keeps expanding out in circular shape like in the picture link below :
https://www.dropbox.com/s/lnxi1be8uogn2zx/20140320_124537.jpg
but i am having difficulty with the center shape , its like it doesnt show up at all on the panel. Here is the class i wrote for the shapes
package graphics.test;
import java.awt.Graphics;
import javax.swing.JPanel;
public class DrawPanel extends JPanel {
public void paintComponent(Graphics g){
super.paintComponent(g);
int width = getWidth();
int height = getHeight();
//top right corner
g.drawLine(0, 0, width/4, height/6);
g.drawLine(0, 0, width/4, height/4);
g.drawLine(0, 0, width/4, height/3);
//top left corner
g.drawLine(width, 0, width - width/4, height/6);
g.drawLine(width, 0, width - width/4, height/4);
g.drawLine(width, 0, width - width/4, height/3);
//bottom left corner
g.drawLine(width, height, width - width/3, height - height/6);
g.drawLine(width, height, width - width/4, height - height/4);
g.drawLine(width, height, width - width/4, height - height/3);
//bottom right corner
g.drawLine(0, height, width/3, height - height/6);
g.drawLine(0, height, width/4, height - height/4);
g.drawLine(0, height, width/4, height - height/3);
//center
for (int i = width/2; i < width/3; i--)
{
for (int j = height/2; j < height/3; j--)
{
g.drawLine(i,j,i,j);
}
}
}
}
解决方案 That looks like an Archimedean Spiral ( http://en.wikipedia.org/wiki/Archimedean_spiral )
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Path2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class SpiralDrawPanelTest
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(new SpiralDrawPanel(),BorderLayout.CENTER);
f.setSize(800, 800);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class SpiralDrawPanel extends JPanel {
@Override
public void paintComponent(Graphics gr)
{
super.paintComponent(gr);
Graphics2D g = (Graphics2D)gr;
AffineTransform at =
AffineTransform.getTranslateInstance(
getWidth()/2, getHeight()/2);
BasicStroke stroke =
new BasicStroke(1.0f,
BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER,
10.0f, new float[]{10.0f}, 0.0f);
g.setStroke(stroke);
Shape shape =
at.createTransformedShape(
createArchimedeanSpiral(Math.PI*10, 10, 250));
g.draw(shape);
}
private static Shape createArchimedeanSpiral(
double totalAngleRad, double alpha, int steps)
{
Path2D path = new Path2D.Double();
path.moveTo(0, 0);
double angleDeltaRad = totalAngleRad / steps;
for (int i=0; i<=steps; i++)
{
double angleRad = i * angleDeltaRad;
double x = Math.sin(angleRad) * alpha * angleRad;
double y = Math.cos(angleRad) * alpha * angleRad;
path.lineTo(x, y);
}
return path;
}
}
EDIT for the comment.
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.geom.Path2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class SpiralDrawPanelTest
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
createAndShowGUI();
}
});
}
private static void createAndShowGUI()
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(new SpiralDrawPanel(),BorderLayout.CENTER);
f.setSize(800, 800);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class SpiralDrawPanel extends JPanel {
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
paintArchimedeanSpiral(g, getWidth()/2, getHeight()/2, Math.PI * 10, 10, 250);
}
private static void paintArchimedeanSpiral(
Graphics g,
double centerX, double centerY,
double totalAngleRad, double alpha, int steps)
{
Path2D path = new Path2D.Double();
path.moveTo(0, 0);
double angleDeltaRad = totalAngleRad / steps;
for (int i=0; i<=steps; i+=2)
{
double angleRad0 = i * angleDeltaRad;
double angleRad1 = i * angleDeltaRad + angleDeltaRad;
double x0 = centerX + Math.sin(angleRad0) * alpha * angleRad0;
double y0 = centerY + Math.cos(angleRad0) * alpha * angleRad0;
double x1 = centerX + Math.sin(angleRad1) * alpha * angleRad1;
double y1 = centerY + Math.cos(angleRad1) * alpha * angleRad1;
g.drawLine((int)x0, (int)y0, (int)x1, (int)y1);
}
}
}
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