リビジョン be89b40a
| learn/java/javafx/ZoomPanCanvas/src/zoompancanvas/ZoomPanCanvasController.java | ||
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public class ZoomPanCanvasController implements Initializable {
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private static final Logger logger = Logger.getLogger(ZoomPanCanvasController.class.getName());
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private static final Affine IDENTITY_TRANSFORM = new Affine(1f, 0f, 0f, 0f, 1f, 0);
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private static final double RADIUS = 10_000f;
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@FXML
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@FXML
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private Label scaleLabel;
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private DoubleProperty scale = new SimpleDoubleProperty(1.0);
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private double translateX;
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private double translateY;
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private Point2D dragStartPoint;
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private Point2D translate = new Point2D(0f, 0f);
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private Point2D prevDragPoint;
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@FXML
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private void handleButtonAction(ActionEvent event) {
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public void initialize(URL url, ResourceBundle rb) {
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scaleLabel.textProperty().bindBidirectional(scale, new NumberStringConverter());
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canvas.setOnScroll(ev -> {
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scale.set((ev.getDeltaY() >= 0) ? scale.get() * 2f : scale.get() / 2f);
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scale.set((ev.getDeltaY() >= 0) ? scale.get() * 1.4f : scale.get() / 1.4f);
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drawCanvas();
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});
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canvas.setOnMousePressed(ev -> {
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dragStartPoint = new Point2D(ev.getSceneX(), ev.getSceneY());
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logger.info("OnMousePressed, dragPoint(scene xy) is " + dragStartPoint);
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prevDragPoint = new Point2D(ev.getSceneX(), ev.getSceneY());
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logger.info(() -> String.format("OnMousePressed, sceneXY=(%f, %f)", ev.getSceneX(), ev.getSceneY()));
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});
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canvas.setOnMouseDragged(ev -> {
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double deltaX = ev.getSceneX() - dragStartPoint.getX();
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double deltaY = ev.getSceneY() - dragStartPoint.getY();
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translateX += deltaX;
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translateY += deltaY;
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logger.info("onMouseDragged, moved is " + deltaX + "," + deltaY);
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Point2D dragPoint = new Point2D(ev.getSceneX(), ev.getSceneY());
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translate = translate.add(dragPoint.subtract(prevDragPoint));
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prevDragPoint = dragPoint;
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logger.info(() -> String.format("OnMouseDragged, sceneXY=(%f, %f), translate=%s",
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ev.getSceneX(), ev.getSceneY(), translate));
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drawCanvas();
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});
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}
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private void drawCanvas() {
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GraphicsContext gc = canvas.getGraphicsContext2D();
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logger.info(() -> String.format("GraphicsContext's transform=%s%n", gc.getTransform().toString()));
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clearCanvas();
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gc.setTransform(getZoomPanTransform(scale.get(), translateX, translateY));
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gc.setTransform(getZoomPanTransform(scale.get(), translate));
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gc.setStroke(Color.DARKBLUE);
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gc.setLineWidth(1 / scale.get());
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gc.strokeLine(-RADIUS, 0, RADIUS, 0);
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| ... | ... | |
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private void clearCanvas() {
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GraphicsContext gc = canvas.getGraphicsContext2D();
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gc.setTransform(getZoomPanTransform(1f, 0, 0));
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gc.setTransform(IDENTITY_TRANSFORM);
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gc.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
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}
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private Affine getZoomPanTransform(double scale, double tx, double ty) {
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return new Affine(scale, 0, tx, 0, scale, ty);
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private Affine getZoomPanTransform(double scale, Point2D translate) {
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return new Affine(scale, 0, translate.getX(), 0, -scale, translate.getY());
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}
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}
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マウスのドラッグ操作でのパン（スクロール）がうまくいっていないバグを修正