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package org.gannacademy.cdf.graphics; |
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import org.gannacademy.cdf.graphics.geom.Path; |
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import java.awt.*; |
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import java.awt.geom.PathIterator; |
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import java.awt.geom.RectangularShape; |
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/** |
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* <p>Superclass of two-dimensional ("rectangular") drawable components</p> |
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* |
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* <p>What makes a component "rectangular"? It's defined by an origin, width and height — like a |
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* {@link org.gannacademy.cdf.graphics.geom.Rectangle} or an {@link org.gannacademy.cdf.graphics.geom.Ellipse}.</p> |
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* |
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* @author <a href="http://github.com/gann-cdf/graphics/issues">Seth Battis</a> |
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*/ |
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abstract public class Drawable2D extends Drawable { |
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private RectangularShape shape; |
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@Override |
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public Shape getShape() { |
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return shape; |
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} |
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/** |
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* <p>Replace the underlying {@link Shape} geometry of the component</p> |
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* |
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* <p>Replacing the {@link Shape} geometry leaves other characteristics (fill, stroke) untouched.</p> |
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* |
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* @param shape of geometry |
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* @throws DrawableException if {@code shape} is incompatible with the class |
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*/ |
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@Override |
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public void setShape(Shape shape) throws DrawableException { |
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if (shape instanceof RectangularShape) { |
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this.shape = (RectangularShape) shape; |
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} else { |
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throw new DrawableException("Cannot convert a Shape to a RectangularShape"); |
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} |
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} |
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/** |
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* Underlying {@link RectangularShape} geometry |
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* |
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* @return Underlying {@link RectangularShape} geometry |
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*/ |
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protected RectangularShape getShapeAsRectangularShape() { |
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return shape; |
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} |
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@Override |
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public void setWidth(double width) { |
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getShapeAsRectangularShape().setFrame(getX(), getY(), width, getHeight()); |
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} |
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@Override |
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public void setHeight(double height) { |
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getShapeAsRectangularShape().setFrame(getX(), getY(), getWidth(), height); |
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} |
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@Override |
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public void translate(double dx, double dy) { |
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getShapeAsRectangularShape().setFrame(getX() + dx, getY() + dy, getWidth(), getHeight()); |
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} |
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@Override |
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public void setLocation(double x, double y) { |
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translate(x - getX(), y - getY()); |
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} |
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/** |
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* Test if shape geometry is defined |
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* |
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* @return {@code true} if the shape does not contain geometry, {@code false} otherwise |
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*/ |
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public boolean isEmpty() { |
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return shape.isEmpty(); |
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} |
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/** |
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* <p>Adjust the frame of the shape's enclosing bounding box</p> |
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* |
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* <p>Adjusting the frame of the shape resizes the geometry to fit within the new bounds</p> |
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* |
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* @param x coordinate of the origin of the new frame |
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* @param y coordinate of the origin of the new frame |
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* @param width of the new frame |
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* @param height of the new frame |
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*/ |
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public void setFrame(double x, double y, double width, double height) { |
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shape.setFrame(x, y, width, height); |
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} |
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/** |
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* <p>Convert a {@code Drawable2D} shape into its equivalent {@code Path}</p> |
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* |
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* <p>{@code Drawable2D} shapes are aligned to the rectangular grid of the cartesian coordinate system: a rectangle |
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* always has sides aligned with the X- and Y-axes of the coordinate system. This means that transformations other |
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* than translation and scale cannot be performed on {@code Drawable2D} shapes, as that would shift them out of |
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* alignment with the axes. However, this method converts the shape into a Path, which <i>can</i> be |
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* transformed.</p> |
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* |
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* <p>Note that the path returned by this method is a new object, separate from the original {@code Drawable2D} |
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* shape.</p> |
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* |
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* @return Path equivalent to the 2D shape |
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*/ |
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public Path getAsPath() { |
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Path p = new Path(getDrawingPanel()); |
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p.setFillColor(getFillColor()); |
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p.setStroke(getStroke()); |
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p.setStrokeColor(getStrokeColor()); |
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PathIterator i = getPathIterator(null); |
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double[] coords = new double[6]; |
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while (!i.isDone()) { |
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switch (i.currentSegment(coords)) { |
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case PathIterator.SEG_CLOSE: |
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p.closePath(); |
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break; |
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case PathIterator.SEG_CUBICTO: |
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p.curveTo(coords[0], coords[1], coords[2], coords[3], coords[4], coords[5]); |
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break; |
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case PathIterator.SEG_LINETO: |
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p.lineTo(coords[0], coords[1]); |
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break; |
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case PathIterator.SEG_MOVETO: |
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p.moveTo(coords[0], coords[1]); |
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break; |
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case PathIterator.SEG_QUADTO: |
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p.quadTo(coords[0], coords[1], coords[2], coords[3]); |
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break; |
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default: |
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System.err.println("!"); |
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} |
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i.next(); |
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} |
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return p; |
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} |
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} |
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gann-cdf /
graphics
