---
category: swing
folder: MouseDrivenImageRotation
title: Mouseで画像を移動、回転
tags: [ImageIcon, MouseListener, MouseMotionListener, AffineTransform, Area]
author: aterai
pubdate: 2009-05-25T13:21:41+09:00
description: 画像をマウスのドラッグで任意の位置に移動、回転します。
image: https://lh4.googleusercontent.com/_9Z4BYR88imo/TQTQAQVe8YI/AAAAAAAAAe4/y6GTZLKjqx0/s800/MouseDrivenImageRotation.png
---
* 概要 [#summary]
画像をマウスのドラッグで任意の位置に移動、回転します。
#download(https://lh4.googleusercontent.com/_9Z4BYR88imo/TQTQAQVe8YI/AAAAAAAAAe4/y6GTZLKjqx0/s800/MouseDrivenImageRotation.png)
* サンプルコード [#sourcecode]
#code(link){{
class DraggableImageMouseListener extends MouseAdapter {
private static final BasicStroke BORDER_STROKE = new BasicStroke(4f);
private static final Color BORDER_COLOR = Color.WHITE;
private static final Color HOVER_COLOR = new Color(100, 255, 200, 100);
private static final int IR = 40;
private static final int OR = IR * 3;
private final Shape border;
private final Shape polaroid;
private final RectangularShape inner = new Ellipse2D.Double(0, 0, IR, IR);
private final RectangularShape outer = new Ellipse2D.Double(0, 0, OR, OR);
private final Point2D startPt = new Point2D.Double(); //drag start point
private final Point2D centerPt = new Point2D.Double(100d, 100d); //center of Image
private final Point2D startPt = new Point2D.Double();
private final Point2D centerPt = new Point2D.Double(100d, 100d);
private final Dimension imageSz;
private final Image image;
private double radian = Math.toRadians(45d); // 45d / 180d * Math.PI;
private double startRadian; //drag start radian
private double startRadian; // drag start radian
private boolean moverHover;
private boolean rotatorHover;
protected DraggableImageMouseListener(ImageIcon ii) {
super();
image = ii.getImage();
int width = ii.getIconWidth();
int height = ii.getIconHeight();
imageSz = new Dimension(width, height);
border = new RoundRectangle2D.Double(0, 0, width, height, 10, 10);
polaroid = new Rectangle2D.Double(-2, -2, width + 4, height + 20);
setCirclesLocation(centerPt);
}
private void setCirclesLocation(Point2D center) {
double cx = center.getX();
double cy = center.getY();
inner.setFrameFromCenter(cx, cy, cx + IR / 2d, cy - IR / 2d);
outer.setFrameFromCenter(cx, cy, cx + OR / 2d, cy - OR / 2d);
}
public void paint(Graphics g, ImageObserver observer) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
double w2 = imageSz.width / 2d;
double h2 = imageSz.height / 2d;
AffineTransform at = AffineTransform.getTranslateInstance(
centerPt.getX() - w2, centerPt.getY() - h2);
at.rotate(radian, w2, h2);
g2.setPaint(BORDER_COLOR);
g2.setStroke(BORDER_STROKE);
Shape s = at.createTransformedShape(polaroid);
g2.fill(s);
g2.draw(s);
g2.drawImage(image, at, observer);
if (rotatorHover) {
Area donut = new Area(outer);
donut.subtract(new Area(inner));
g2.setPaint(HOVER_COLOR);
g2.fill(donut);
} else if (moverHover) {
g2.setPaint(HOVER_COLOR);
g2.fill(inner);
}
g2.setPaint(BORDER_COLOR);
g2.setStroke(BORDER_STROKE);
g2.draw(at.createTransformedShape(border));
g2.dispose();
}
@Override public void mouseMoved(MouseEvent e) {
if (outer.contains(e.getX(), e.getY())
&& !inner.contains(e.getX(), e.getY())) {
moverHover = false;
rotatorHover = true;
} else if (inner.contains(e.getX(), e.getY())) {
moverHover = true;
rotatorHover = false;
} else {
moverHover = false;
rotatorHover = false;
}
e.getComponent().repaint();
}
@Override public void mouseReleased(MouseEvent e) {
rotatorHover = false;
moverHover = false;
e.getComponent().repaint();
}
@Override public void mousePressed(MouseEvent e) {
if (outer.contains(e.getX(), e.getY())
&& !inner.contains(e.getX(), e.getY())) {
rotatorHover = true;
startRadian = radian - Math.atan2(
e.getY() - centerPt.getY(), e.getX() - centerPt.getX());
e.getComponent().repaint();
} else if (inner.contains(e.getX(), e.getY())) {
moverHover = true;
startPt.setLocation(e.getPoint());
e.getComponent().repaint();
}
}
@Override public void mouseDragged(MouseEvent e) {
if (rotatorHover) {
radian = startRadian + Math.atan2(
e.getY() - centerPt.getY(), e.getX() - centerPt.getX());
e.getComponent().repaint();
} else if (moverHover) {
centerPt.setLocation(
centerPt.getX() + e.getX() - startPt.getX(),
centerPt.getY() + e.getY() - startPt.getY());
setCirclesLocation(centerPt);
startPt.setLocation(e.getPoint());
e.getComponent().repaint();
}
}
}
}}
* 解説 [#explanation]
- 画像の移動: 画像の中心にマウスが近づくと表示される円図形をドラッグ
- 画像の回転: 上記の円図形の外側に表示されるドーナツ型図形をドラッグ
-- ドーナツ型図形は`Area#subtract(Area)`メソッドを使用して作成可能
* 参考リンク [#reference]
- [http://satoshi.blogs.com/life/2007/05/uiflash_2.html Life is beautiful: 習作UI：初めてのFlash その３]
-- `Flash`の`UI`を参考
- [https://docs.oracle.com/javase/jp/8/docs/api/java/awt/geom/Area.html#subtract-java.awt.geom.Area- Area#subtract(Area) (Java Platform SE 8)]
* コメント [#comment]
#comment
#comment