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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.Arc2D; |
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import java.awt.geom.Rectangle2D; |
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/** |
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* <p>Draw an arc as a section of an ellipse</p> |
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* |
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* <p><img src="doc-files/Arc.png" alt="Arc diagram"></p> |
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* |
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* <p>Arcs are sections of ellipses, 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 Arc extends Drawable2D { |
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/** |
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* <p>Construct a new arc</p> |
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* |
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* <p><img src="doc-files/Arc.png" alt="Diagram of Arc 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 start angle in degrees (measured counter-clockwise from 0° (a.k.a. "east") |
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* @param extent angle in degrees of the arc (measured counter-clockwise from {@code start}) |
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* @param drawingPanel on which to draw |
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*/ |
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public Arc(double x, double y, double width, double height, double start, double extent, DrawingPanel drawingPanel) { |
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try { |
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setShape(new Arc2D.Double(x, y, width, height, start, extent, Arc2D.PIE)); |
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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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/** |
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* Underlying {@link Arc2D} geometry |
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* |
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* @return Underlying {@link Arc2D} geometry |
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*/ |
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protected Arc2D getShapeAsArc() { |
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return (Arc2D) getShape(); |
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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 Arc2D) { |
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super.setShape(shape); |
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} else { |
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throw new DrawableException("Attempt to set Arc's underlying shape to a non-Arc2D instance"); |
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} |
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} |
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/** |
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* Start angle of arc |
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* |
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* @return Angle measured counter-clockwise in degrees from 0° (East) of start of ellipse segment |
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* @see Arc2D#getAngleStart() |
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*/ |
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public double getAngleStart() { |
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return getShapeAsArc().getAngleStart(); |
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} |
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/** |
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* Extent angle of arc |
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* |
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* @return Angle measured counter-clockwise in degrees from start angle determining extent of arc |
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* @see Arc2D#getAngleExtent() |
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*/ |
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public double getAngleExtent() { |
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return getShapeAsArc().getAngleExtent(); |
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} |
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/** |
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* Set start angle of arc |
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* |
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* @param start Angle measured counter-clockwise in degrees from 0° (East) of start of ellipse segment |
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* @see Arc2D#setAngleStart(double) |
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*/ |
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public void setAngleStart(double start) { |
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getShapeAsArc().setAngleStart(start); |
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} |
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/** |
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* Set extent angle of arc |
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* |
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* @param extent Angle measured counter-clockwise in degrees from start angle determining extent of arc |
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* @see Arc2D#setAngleExtent(double) |
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*/ |
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public void setAngleExtent(double extent) { |
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getShapeAsArc().setAngleExtent(extent); |
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} |
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@Override |
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public double getHeight() { |
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return getShapeAsArc().getHeight(); |
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} |
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@Override |
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public double getWidth() { |
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return getShapeAsArc().getWidth(); |
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} |
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@Override |
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public double getX() { |
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return getShapeAsArc().getX(); |
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} |
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@Override |
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public double getY() { |
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return getShapeAsArc().getY(); |
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} |
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@Override |
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public Rectangle2D getBounds() { |
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return getShapeAsArc().getBounds(); |
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} |
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} |
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gann-cdf /
graphics
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