Javaでスクロール可能なパネルのズームとパンを制御できるようにするコードをインターネットで見つけましたが、この領域内の形状を操作できるようにしたいのですが、x座標とy座標を元に戻すのに問題があります(拡大されていない) 寸法 ..
これらの図形でやりたいことがいくつかありますが、まず、マウスがそれらの中で移動したときに 2 つのエンティティの四角形を赤く塗るにはどうすればよいでしょうか?
これまでのコードは次のとおりです。
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class CanvasPane extends JPanel {
private static Canvas canvas;
public CanvasPane(boolean isDoubleBuffered) {
super(isDoubleBuffered);
setLayout(new BorderLayout());
canvas = new Canvas(1.0);
JScrollPane pane = new JScrollPane(canvas);
pane.getViewport().setBackground(Color.DARK_GRAY);
add(pane, BorderLayout.CENTER);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Test Graphics");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new CanvasPane(true), BorderLayout.CENTER);
frame.pack();
frame.setSize(800, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
//Initial scrolling of the canvas to its center
Rectangle canvasRectangle = canvas.getBounds();
Rectangle visibleRectangle = canvas.getVisibleRect();
double tx = (canvasRectangle.getWidth() - visibleRectangle.getWidth())/2;
double ty = (canvasRectangle.getHeight() - visibleRectangle.getHeight())/2;
visibleRectangle.setBounds((int)tx, (int)ty, visibleRectangle.width, visibleRectangle.height);
canvas.scrollRectToVisible(visibleRectangle);
}
}
class Canvas extends JComponent implements MouseWheelListener, MouseMotionListener, MouseListener {
private static final long serialVersionUID = 1L;
private double zoom = 1.0;
public static final double SCALE_STEP = 0.1d;
private Dimension initialSize;
private Point origin;
private double previousZoom = zoom;
private double scrollX = 0d;
private double scrollY = 0d;
private Rectangle2D workspace = new Rectangle2D.Double(0,0, 1024, 768);
private Rectangle entity1 = new Rectangle(10, 10, 100, 100);
private Rectangle entity2 = new Rectangle(300, 300, 100, 100);
public Canvas(double zoom) {
this.zoom = zoom;
addMouseWheelListener(this);
addMouseMotionListener(this);
addMouseListener(this);
setAutoscrolls(true);
setPreferredSize(new Dimension((int)workspace.getWidth(), (int)workspace.getHeight()));
}
@Override public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
//Zoom graphics
g2d.scale(zoom, zoom);
//translate graphics to be always in center of the canvas
Rectangle size = getBounds();
double tx = ((size.getWidth() - workspace.getWidth() * zoom) / 2) / zoom;
double ty = ((size.getHeight() - workspace.getHeight() * zoom) / 2) / zoom;
g2d.translate(tx, ty);
//Draw
g2d.setColor(Color.LIGHT_GRAY);
g2d.fill(workspace);
g2d.setColor(Color.DARK_GRAY);
g2d.setStroke(new BasicStroke(5.0f));
g2d.draw(workspace);
g2d.draw(entity1);
g2d.draw(entity2);
}
@Override public void setSize(Dimension size) {
super.setSize(size);
if (initialSize == null) {
this.initialSize = size;
}
}
@Override public void setPreferredSize(Dimension preferredSize) {
super.setPreferredSize(preferredSize);
if (initialSize == null) {
this.initialSize = preferredSize;
}
}
public void mouseWheelMoved(MouseWheelEvent e) {
double zoomFactor = -SCALE_STEP * e.getPreciseWheelRotation() * zoom;
zoom = Math.abs(zoom + zoomFactor);
//Here we calculate new size of canvas relative to zoom.
Dimension d = new Dimension(
(int)(initialSize.width * zoom),
(int)(initialSize.height * zoom));
setPreferredSize(d);
setSize(d);
validate();
followMouseOrCenter(e.getPoint());
previousZoom = zoom;
}
public void followMouseOrCenter(Point2D point) {
Rectangle size = getBounds();
Rectangle visibleRect = getVisibleRect();
scrollX = size.getCenterX();
scrollY = size.getCenterY();
if (point != null) {
scrollX = point.getX() / previousZoom * zoom - (point.getX() - visibleRect.getX());
scrollY = point.getY() / previousZoom * zoom - (point.getY() - visibleRect.getY());
}
visibleRect.setRect(scrollX, scrollY, visibleRect.getWidth(), visibleRect.getHeight());
scrollRectToVisible(visibleRect);
}
public void mouseDragged(MouseEvent e) {
if (origin != null) {
int deltaX = origin.x - e.getX();
int deltaY = origin.y - e.getY();
Rectangle view = getVisibleRect();
view.x += deltaX;
view.y += deltaY;
scrollRectToVisible(view);
}
}
public void mousePressed(MouseEvent e) {
origin = new Point(e.getPoint());
}
public void mouseMoved(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
}
次のコードを使用して計算しようとしましたが、これは正しくありません
public void mouseMoved(MouseEvent e) {
double x = e.getX() / zoom;
double y = e.getY() / zoom;
double x2 = getWidth() - workspace.getWidth() * zoom;
double y2 = getHeight() - workspace.getHeight() * zoom;
if(x2 > 0) x -= x2;
if(y2 > 0) y -= y2;
Point p = new Point((int)x, (int)y);
if(entity1.contains(p)) {
intersects = true;
}
else {
intersects = false;
}
repaint();
}