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package org.gannacademy.cdf.graphics.geom; |
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import org.gannacademy.cdf.graphics.Drawable2D; |
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import org.gannacademy.cdf.graphics.DrawableException; |
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import org.gannacademy.cdf.graphics.ui.DrawingPanel; |
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import java.awt.*; |
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import java.awt.geom.Ellipse2D; |
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/** |
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* <p>Draw an ellipse</p> |
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* |
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* <p><img src="doc-files/Ellipse.png" alt="Ellipse diagram"></p> |
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* |
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* <p>Ellipses are drawn inscribed within their rectangular bounding box.</p> |
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* |
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* @author <a href="https://github.com/gann-cdf/graphics/issues" target="_blank">Seth Battis</a> |
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*/ |
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public class Ellipse extends Drawable2D { |
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/** |
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* <p>Construct a new ellipse</p> |
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* |
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* <p><img src="doc-files/Ellipse.png" alt="Diagram of Ellipse parameters"></p> |
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* |
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* <p>All window coordinates are measured in pixels, with the X-axis increasing from left to right and the Y-axis |
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* increasing from top to bottom. All window coordinates exist in the first quadrant.</p> |
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* |
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* <p><img src="../doc-files/window-coordinates.png" alt="Diagram of window coordinates"></p> |
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* |
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* @param x coordinate of origin |
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* @param y coordinate of origin |
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* @param width in pixels |
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* @param height in pixels |
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* @param drawingPanel on which to draw |
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*/ |
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public Ellipse(double x, double y, double width, double height, DrawingPanel drawingPanel) { |
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try { |
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setShape(new Ellipse2D.Double(x, y, width, height)); |
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setDrawingPanel(drawingPanel); |
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} catch (DrawableException e) { |
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System.err.println(e.getMessage()); |
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e.printStackTrace(); |
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} |
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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 Ellipse2D) { |
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super.setShape(shape); |
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} else { |
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throw new DrawableException("Attempt to set Ellipse's underlying shape to a non-Ellipse2D instance"); |
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} |
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} |
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} |
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gann-cdf /
graphics
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