/**
* returns the skew transform
*
* @param svgHandle a svg handle
* @param bounds the bounds of the area to transform
* @param firstPoint the first clicked point by the user
* @param currentPoint the current point of the drag action by the user
* @param item the selection item
* @return the skew transform
*/
protected AffineTransform getSkewTransform(
SVGHandle svgHandle,
Rectangle2D bounds,
Point2D firstPoint,
Point2D currentPoint,
SelectionItem item) {
// getting the skew factor
double skewX = 0, skewY = 0;
boolean isHorizontal =
(item.getType() == SelectionItem.NORTH || item.getType() == SelectionItem.SOUTH);
if (bounds.getWidth() > 0 && bounds.getHeight() > 0) {
if (isHorizontal) {
skewX = (currentPoint.getX() - firstPoint.getX()) / bounds.getHeight();
} else {
skewY = (currentPoint.getY() - firstPoint.getY()) / bounds.getWidth();
}
}
// getting the center point
Point2D centerPoint = getRotationSkewCenterPoint(svgHandle, bounds);
// creating the affine transform
AffineTransform af =
AffineTransform.getTranslateInstance(-centerPoint.getX(), -centerPoint.getY());
af.preConcatenate(AffineTransform.getShearInstance(skewX, skewY));
af.preConcatenate(AffineTransform.getTranslateInstance(centerPoint.getX(), centerPoint.getY()));
return af;
}
@Override
public UndoRedoAction validateAction(
SVGHandle handle,
int level,
Set<Element> elementSet,
SelectionItem item,
Point2D firstPoint,
Point2D lastPoint) {
// the undo/redo action that will be returned
UndoRedoAction undoRedoAction = null;
// getting the element that will undergo the action
Element element = elementSet.iterator().next();
// executing the accurate action
switch (level) {
case 0:
// getting the resize transform
AffineTransform resizeTransform =
getResizeTransform(handle, element, item, firstPoint, lastPoint);
// executing the resize action
undoRedoAction = resize(handle, elementSet, resizeTransform);
break;
case 1:
if (item.getType() != SelectionItem.CENTER) {
// getting the center point
Point2D centerPoint = getRotationSkewCenterPoint(handle, element);
if (item.getType() == SelectionItem.NORTH_WEST
|| item.getType() == SelectionItem.NORTH_EAST
|| item.getType() == SelectionItem.SOUTH_EAST
|| item.getType() == SelectionItem.SOUTH_WEST) {
// getting the angle for the rotation
double angle = ShapeToolkit.getRotationAngle(centerPoint, firstPoint, lastPoint);
// executing the rotation action
undoRedoAction = rotate(handle, elementSet, centerPoint, angle);
} else {
// getting the skew factor and whether it's horizontal
// or not
boolean isHorizontal =
(item.getType() == SelectionItem.NORTH || item.getType() == SelectionItem.SOUTH);
double skewFactor = 0;
if (isHorizontal) {
skewFactor = lastPoint.getX() - firstPoint.getX();
} else {
skewFactor = lastPoint.getY() - firstPoint.getY();
}
// executing the skew action
undoRedoAction = skew(handle, elementSet, centerPoint, skewFactor, isHorizontal);
}
rotationSkewSelectionItemCenterPoint = null;
} else {
rotationSkewCenterPoint = rotationSkewSelectionItemCenterPoint;
rotationSkewSelectionItemCenterPoint = null;
}
break;
}
return undoRedoAction;
}
@Override
public CanvasPainter showAction(
SVGHandle handle,
int level,
Set<Element> elementSet,
SelectionItem item,
Point2D firstPoint,
Point2D currentPoint) {
// getting the element that will undergo the action
Element element = elementSet.iterator().next();
// the canvas painter that should be returned
CanvasPainter painter = null;
// whether the shape should be painted
boolean canPaintShape = true;
// the shape that will be painted
Shape shape = null;
// getting the action transform
AffineTransform actionTransform = null;
switch (level) {
case 0:
// getting the resize transform
actionTransform = getResizeTransform(handle, element, item, firstPoint, currentPoint);
break;
case 1:
if (item.getType() == SelectionItem.CENTER) {
// storing the center point for the rotate action
rotationSkewSelectionItemCenterPoint = currentPoint;
item.setPoint(currentPoint);
canPaintShape = false;
} else if (item.getType() == SelectionItem.NORTH_WEST
|| item.getType() == SelectionItem.NORTH_EAST
|| item.getType() == SelectionItem.SOUTH_EAST
|| item.getType() == SelectionItem.SOUTH_WEST) {
// getting the rotation transform
actionTransform = getRotationTransform(handle, element, firstPoint, currentPoint);
} else {
// getting the skew transform
actionTransform = getSkewTransform(handle, element, firstPoint, currentPoint, item);
}
break;
}
if (actionTransform != null) {
// getting the initial shape
shape = getShape(handle, element, true);
// getting the element's transform
AffineTransform transform = handle.getSvgElementsManager().getTransform(element);
// concatenating the action transform to the element's transform
transform.preConcatenate(actionTransform);
// computing the screen scaled shape
shape = handle.getTransformsManager().getScaledShape(shape, false, transform);
}
if (canPaintShape && shape != null) {
final Shape fshape = shape;
// creating the set of the clips
final HashSet<Rectangle2D> fclips = new HashSet<Rectangle2D>();
fclips.add(fshape.getBounds2D());
painter =
new CanvasPainter() {
@Override
public void paintToBeDone(Graphics2D g) {
g = (Graphics2D) g.create();
g.setRenderingHint(
RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setColor(strokeColor);
g.draw(fshape);
g.dispose();
}
@Override
public Set<Rectangle2D> getClip() {
return fclips;
}
};
}
return painter;
}
/**
* returns the resize transform corresponding to the parameters
*
* @param handle a svg handle
* @param bounds the bounds of the area to be resized
* @param item the selection item
* @param firstPoint the first point
* @param secondPoint the second point
* @return the resize transform corresponding to the parameters
*/
protected AffineTransform getResizeTransform(
SVGHandle handle,
Rectangle2D bounds,
SelectionItem item,
Point2D firstPoint,
Point2D secondPoint) {
// getting the diff point
Point2D diff =
new Point2D.Double(
secondPoint.getX() - firstPoint.getX(), secondPoint.getY() - firstPoint.getY());
// getting the scale and the translation factors
double sx = 1.0, sy = 1.0, tx = 0, ty = 0;
int type = item.getType();
if (Editor.getEditor().getSquareModeManager().isSquareMode()) {
switch (type) {
case SelectionItem.NORTH:
diff = new Point2D.Double(diff.getY(), diff.getY());
sy = 1 - diff.getY() / bounds.getHeight();
sx = sy;
tx = (bounds.getX() + bounds.getWidth() / 2) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.SOUTH:
diff = new Point2D.Double(diff.getY(), diff.getY());
sy = 1 + diff.getY() / bounds.getHeight();
sx = sy;
tx = (bounds.getX() + bounds.getWidth() / 2) * (1 - sx);
ty = bounds.getY() * (1 - sy);
break;
case SelectionItem.EAST:
diff = new Point2D.Double(diff.getX(), diff.getX());
sx = 1 + diff.getX() / bounds.getWidth();
sy = sx;
tx = bounds.getX() * (1 - sx);
ty = (bounds.getY() + bounds.getHeight() / 2) * (1 - sy);
break;
case SelectionItem.WEST:
diff = new Point2D.Double(diff.getX(), -diff.getX());
sx = 1 - diff.getX() / bounds.getWidth();
sy = sx;
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight() / 2) * (1 - sy);
break;
case SelectionItem.NORTH_EAST:
diff = new Point2D.Double(diff.getX(), -diff.getX());
sx = 1 + diff.getX() / bounds.getWidth();
sy = sx;
tx = (bounds.getX()) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.NORTH_WEST:
diff = new Point2D.Double(diff.getY(), diff.getY());
sy = 1 - diff.getY() / bounds.getHeight();
sx = sy;
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.SOUTH_EAST:
diff = new Point2D.Double(diff.getY(), diff.getY());
sy = 1 + diff.getY() / bounds.getHeight();
sx = sy;
tx = bounds.getX() * (1 - sx);
ty = bounds.getY() * (1 - sy);
break;
case SelectionItem.SOUTH_WEST:
diff = new Point2D.Double(diff.getX(), -diff.getX());
sx = 1 - diff.getX() / bounds.getWidth();
sy = sx;
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
ty = (bounds.getY()) * (1 - sy);
break;
}
} else {
switch (type) {
case SelectionItem.NORTH:
sy = 1 - diff.getY() / bounds.getHeight();
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.SOUTH:
sy = 1 + diff.getY() / bounds.getHeight();
ty = bounds.getY() * (1 - sy);
break;
case SelectionItem.EAST:
sx = 1 + diff.getX() / bounds.getWidth();
tx = bounds.getX() * (1 - sx);
break;
case SelectionItem.WEST:
sx = 1 - diff.getX() / bounds.getWidth();
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
break;
case SelectionItem.NORTH_EAST:
sx = 1 + diff.getX() / bounds.getWidth();
sy = 1 - diff.getY() / bounds.getHeight();
tx = (bounds.getX()) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.NORTH_WEST:
sx = 1 - diff.getX() / bounds.getWidth();
sy = 1 - diff.getY() / bounds.getHeight();
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
ty = (bounds.getY() + bounds.getHeight()) * (1 - sy);
break;
case SelectionItem.SOUTH_EAST:
sx = 1 + diff.getX() / bounds.getWidth();
sy = 1 + diff.getY() / bounds.getHeight();
tx = bounds.getX() * (1 - sx);
ty = bounds.getY() * (1 - sy);
break;
case SelectionItem.SOUTH_WEST:
sx = 1 - diff.getX() / bounds.getWidth();
sy = 1 + diff.getY() / bounds.getHeight();
tx = (bounds.getX() + bounds.getWidth()) * (1 - sx);
ty = (bounds.getY()) * (1 - sy);
break;
}
}
// creating the transform
AffineTransform af = new AffineTransform();
af.preConcatenate(AffineTransform.getScaleInstance(sx, sy));
af.preConcatenate(AffineTransform.getTranslateInstance(tx, ty));
return af;
}