- 追加された行はこの色です。
- 削除された行はこの色です。
TITLE:JPanelにマウスで自由曲線を描画
#navi(../)
RIGHT:Posted by [[terai]] at 2005-12-19
*JPanelにマウスで自由曲線を描画 [#n9266a0a]
マウスをドラッグしてパネル上に自由曲線を描画します。
-&jnlp;
-&jar;
-&zip;
#screenshot
**サンプルコード [#jb2b9b9e]
#code{{
class PaintPanel extends JPanel implements MouseMotionListener, MouseListener {
private Point startPoint = new Point(-1,-1);
private Point endPoint = new Point(-1,-1);
public PaintPanel() {
super();
addMouseMotionListener(this);
addMouseListener(this);
}
public void paintComponent(Graphics g) {
//super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setStroke(new BasicStroke(3.0F));
g2d.setPaint(Color.BLACK);
g2d.drawLine(startPoint.x, startPoint.y,
endPoint.x, endPoint.y);
startPoint = endPoint;
}
public void mouseDragged(MouseEvent e) {
endPoint = e.getPoint();
repaint();
}
public void mousePressed(MouseEvent e) {
startPoint = e.getPoint();
}
public void mouseMoved(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
}
}}
**解説 [#t35e18f2]
上記のサンプルでは、パネル上でマウスがドラッグされている場合、その軌跡を短い直線でつなぎ合わせて描画することで、お絵かきしています。
- マウスがクリックされた場所を始点にする
- ドラッグされた時の位置を終点にしてパネルをrepaint
- paintComponentをオーバーライドして、上記の始点、終点で直線を描画
- 次の直線のための始点を現在の終点に変更
//**参考リンク
**コメント [#j1077dd9]
- マウス右ボタンをドラッグで消しゴム…のテスト -- [[terai]] &new{2010-01-12 (火) 16:16:59};
#code{{
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
class PaintPanel2 extends JPanel implements MouseMotionListener, MouseListener {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new PaintPanel2());
frame.setSize(320, 240);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private final Polygon polygon = new Polygon();
private Point startPoint = new Point(-1,-1);
private BufferedImage offImage = null;
private BufferedImage backImage = null;
private TexturePaint texture = makeTexturePaint();
private int[] pix = new int[320 * 240];
public PaintPanel2() {
super();
addMouseMotionListener(this);
addMouseListener(this);
offImage = new BufferedImage(320, 240, BufferedImage.TYPE_4BYTE_ABGR);
PixelGrabber pg = new PixelGrabber(offImage, 0, 0, 320, 240, pix, 0, 320);
try {
pg.grabPixels();
} catch (Exception e) {
e.printStackTrace();
}
backImage = new BufferedImage(320, 240, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2 = backImage.createGraphics();
g2.setPaint(texture);
g2.fillRect(0,0,320,240);
g2.dispose();
}
private static BufferedImage makeBGImage() {
Color color = new Color(200,150,100,50);
int cs = 6, sz = cs*cs;
BufferedImage img = new BufferedImage(sz,sz,BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2 = img.createGraphics();
g2.setPaint(color);
g2.fillRect(0,0,sz,sz);
for (int i=0; i*cs<sz; i++) {
for (int j=0; j*cs<sz; j++) {
if ((i+j)%2==0) g2.fillRect(i*cs, j*cs, cs, cs);
}
}
g2.dispose();
return img;
}
private static TexturePaint makeTexturePaint() {
BufferedImage img = makeBGImage();
int w = img.getWidth(), h = img.getHeight();
Rectangle2D r2d = new Rectangle2D.Float(0,0,w,h);
return new TexturePaint(img, r2d);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (backImage!=null) {
((Graphics2D)g).drawImage(backImage, 0, 0, this);
}
if (offImage!=null) {
MemoryImageSource producer = new MemoryImageSource(320, 240, pix, 0, 320);
g.drawImage(createImage(producer), 0, 0, null);
g.dispose();
}
}
int penc = 0x0;
public void mouseDragged(MouseEvent e) {
Point pt = e.getPoint();
double xDelta = e.getX() - startPoint.getX();
double yDelta = e.getY() - startPoint.getY();
double delta = Math.max(Math.abs(xDelta), Math.abs(yDelta));
double xIncrement = xDelta / delta;
double yIncrement = yDelta / delta;
double xStart = startPoint.x;
double yStart = startPoint.y;
for (int i=0; i<delta; i++) {
Point p = new Point((int)xStart, (int)yStart);
if (p.x<0 || p.y<0 || p.x>=320 || p.y>=240) break;
pix[p.x + p.y * 320] = penc;
for(int n=-1;n<=1;n++) {
for(int m=-1;m<=1;m++) {
int t = (p.x+n) + (p.y+m) * 320;
if(t>=0 && t<320*240) {
pix[t] = penc;
}
}
}
repaint(p.x-2, p.y-2, 4, 4);
xStart += xIncrement;
yStart += yIncrement;
}
startPoint = pt;
}
private Rectangle getRepaintRectangle(Point srcPoint, Point destPoint) {
polygon.reset();
polygon.addPoint(srcPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, srcPoint.y);
polygon.addPoint(destPoint.x, destPoint.y);
polygon.addPoint(srcPoint.x, destPoint.y);
return polygon.getBounds();
}
public void mousePressed(MouseEvent e) {
startPoint = e.getPoint();
penc = (e.getButton()==MouseEvent.BUTTON1)?0xff000000:0x0;
}
public void mouseMoved(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
}
}}
- この間も俊太郎の詩をお http://www.stlouisbusinesslist.com/business/5021837.htm?info=viagra viagra =-(( -- [[viagra]] &new{2010-03-08 (月) 12:34:33};
#comment