| /****************************************************************************** |
| * Copyright (c) 2003, 2006 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| |
| package org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile; |
| |
| import java.awt.Graphics2D; |
| import java.awt.Point; |
| import java.awt.Rectangle; |
| import java.awt.Shape; |
| import java.awt.geom.Arc2D; |
| import java.awt.geom.GeneralPath; |
| import java.awt.geom.Point2D; |
| import java.io.IOException; |
| |
| import org.apache.batik.transcoder.TranscoderException; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.DeviceContext; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.GdiBrush; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.GdiPen; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.IEmf2SvgConverter; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.IRenderToPath; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.IWmf2SvgConverter; |
| import org.eclipse.gmf.runtime.draw2d.ui.render.awt.internal.svg.metafile.Record; |
| |
| /** |
| * @author dhabib |
| * @canBeSeenBy org.eclipse.gmf.runtime.draw2d.ui.render.* |
| * |
| */ |
| public class Arc implements IEmf2SvgConverter, IWmf2SvgConverter, IRenderToPath |
| { |
| public static final int ARC = 1; |
| public static final int ARCTO = 2; |
| public static final int PIE = 3; |
| public static final int CHORD = 4; |
| |
| private static final int EMF_BOX_OFFSET = 0; |
| private static final int EMF_START_OFFSET = 16; |
| private static final int EMF_END_OFFSET = 24; |
| |
| private static final int WMF_Y_END_OFFSET = 0; |
| private static final int WMF_X_END_OFFSET = 2; |
| private static final int WMF_Y_START_OFFSET = 4; |
| private static final int WMF_X_START_OFFSET = 6; |
| private static final int WMF_BOTTOM_OFFSET = 8; |
| private static final int WMF_RIGHT_OFFSET = 10; |
| private static final int WMF_TOP_OFFSET = 12; |
| private static final int WMF_LEFT_OFFSET = 14; |
| |
| private int m_type = ARC; |
| |
| private Rectangle m_box = new Rectangle(); |
| private Point m_start = new Point( 0, 0 ); |
| private Point m_end = new Point( 0, 0 ); |
| |
| |
| public Arc( int type ) |
| { |
| m_type = type; |
| } |
| |
| public void readWMFRecord( Record rec ) throws IOException |
| { |
| int xStart = rec.getShortAt( WMF_X_START_OFFSET ); |
| int yStart = rec.getShortAt( WMF_Y_START_OFFSET ); |
| int xEnd = rec.getShortAt( WMF_X_END_OFFSET ); |
| int yEnd = rec.getShortAt( WMF_Y_END_OFFSET ); |
| |
| int xBound = rec.getShortAt( WMF_LEFT_OFFSET ); |
| int yBound = rec.getShortAt( WMF_TOP_OFFSET ); |
| int x1Bound = rec.getShortAt( WMF_RIGHT_OFFSET ); |
| int y1Bound = rec.getShortAt( WMF_BOTTOM_OFFSET ); |
| |
| m_box = new Rectangle( xBound, yBound, x1Bound - xBound, y1Bound - yBound ); |
| m_start = new Point( xStart, yStart ); |
| m_end = new Point( xEnd, yEnd ); |
| } |
| |
| public void readEMFRecord( Record emr ) throws IOException |
| { |
| m_box = emr.getRectangleLAt( EMF_BOX_OFFSET ); |
| m_start = emr.getPointLAt( EMF_START_OFFSET ); |
| m_end = emr.getPointLAt( EMF_END_OFFSET ); |
| } |
| |
| public void render( Graphics2D g, DeviceContext context ) throws TranscoderException |
| { |
| Shape shape = getShape( context ); |
| |
| if( m_type == PIE || m_type == CHORD ) |
| { |
| GdiBrush brush = context.getCurBrush(); |
| |
| if( brush != null ) |
| { |
| brush.fill( shape, g, context ); |
| } |
| } |
| |
| GdiPen curPen = context.getCurPen(); |
| |
| if( curPen != null ) |
| { |
| curPen.apply( g, context ); |
| |
| if( m_type == ARCTO ) |
| { |
| Arc2D.Double arc = (Arc2D.Double) shape; |
| Point2D point = arc.getStartPoint(); |
| |
| g.drawLine( context.convertXToSVGLogicalUnits( context.getCurPosX() ), |
| context.convertYToSVGLogicalUnits( context.getCurPosY() ), |
| (int) point.getX(), |
| (int) point.getY() ); |
| } |
| |
| g.draw( shape ); |
| } |
| |
| if( m_type == ARCTO ) |
| { |
| Arc2D.Double arc = (Arc2D.Double) shape; |
| Point2D point = arc.getEndPoint(); |
| context.setCurPosX( context.convertXToWindowsLogicalUnits( (int) point.getX() ) ); |
| context.setCurPosY( context.convertYToWindowsLogicalUnits( (int) point.getY() ) ); |
| } |
| } |
| |
| public void render( DeviceContext context ) throws TranscoderException |
| { |
| Shape shape = getShape( context ); |
| |
| if( m_type == ARCTO ) |
| { |
| GeneralPath p = context.getGdiPath().getCurrentFigure(); |
| p.append( shape, true ); |
| Arc2D.Double arc = (Arc2D.Double) shape; |
| Point2D point = arc.getEndPoint(); |
| context.setCurPosX( context.convertXToWindowsLogicalUnits( (int) point.getX() ) ); |
| context.setCurPosY( context.convertYToWindowsLogicalUnits( (int) point.getY() ) ); |
| } |
| else |
| { |
| // Do not update the cursor position on the 'main' path. |
| context.getGdiPath().appendFigure( shape ); |
| } |
| } |
| |
| private int getAngle( int triWidth, int triHeight ) |
| { |
| double tan = 0.0; |
| if( triWidth != 0 ) |
| { |
| tan = (double) triHeight / (double) triWidth; |
| } |
| |
| // The 'tangent' of this is triHeight/triWidth. We want the angle so compute the arcTan of |
| // this value. |
| int angle = (int)Math.toDegrees( Math.atan( tan ) ); |
| |
| if( triWidth < 0 ) |
| { |
| // 2nd or 3rd quadrant. |
| angle += 180; |
| } |
| else if( triHeight < 0 ) |
| { |
| // 4th quadrant. angle will be negative. Convert to a positive angle. |
| angle += 360; |
| } |
| |
| return angle; |
| } |
| |
| private Shape getShape( DeviceContext context ) |
| { |
| int x = context.convertXToSVGLogicalUnits( m_box.x ); |
| int y = context.convertYToSVGLogicalUnits( m_box.y ); |
| int w = context.scaleX( m_box.width ); |
| int h = context.scaleY( m_box.height ); |
| |
| int centerArcX = x + ( w / 2 ); |
| int centerArcY = y + ( h / 2 ); |
| |
| // Get the 'start angle', which is the angle from the center point of the containing rectangle |
| // to the intersection of the arc with the containing rectangle. |
| |
| // Get the two 'legs' of the right triangle formed by the bounding box, the x/y axis and the line |
| // from the centerpoint to the start point. |
| int startPointX = context.convertXToSVGLogicalUnits( m_start.x ); |
| int startPointY = context.convertYToSVGLogicalUnits( m_start.y ); |
| int triWidth = startPointX - centerArcX; |
| int triHeight = centerArcY - startPointY ; |
| |
| // The 'tangent' of this is triHeight/triWidth. We want the angle so compute the arcTan of |
| // this value. |
| int startAngle = getAngle( triWidth, triHeight ); |
| |
| // Do the same for the 'end point); |
| int endPointX = context.convertXToSVGLogicalUnits( m_end.x ); |
| int endPointY = context.convertYToSVGLogicalUnits( m_end.y ); |
| triWidth = endPointX - centerArcX; |
| triHeight = centerArcY - endPointY; |
| |
| int endAngle = getAngle( triWidth, triHeight ); |
| int arcAngle; |
| |
| if( context.getArcDirection() == DeviceContext.AD_COUNTERCLOCKWISE ) |
| { |
| arcAngle = endAngle - startAngle; |
| } |
| else |
| { |
| arcAngle = startAngle - endAngle; |
| } |
| |
| int arcType; |
| |
| if( m_type == ARC || m_type == ARCTO ) |
| { |
| arcType = Arc2D.OPEN; |
| } |
| else if( m_type == CHORD ) |
| { |
| arcType = Arc2D.CHORD; |
| } |
| else |
| { |
| arcType = Arc2D.PIE; |
| } |
| |
| Rectangle bounds = new Rectangle( x, y, w, h ); |
| Arc2D.Double arc = new Arc2D.Double(); |
| |
| arc.setArc( bounds, startAngle, arcAngle, arcType ); |
| |
| return arc; |
| } |
| } |