org.apache.poi.hssf.usermodel.EscherGraphics Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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See the License for the specific language governing permissions and
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package org.apache.poi.hssf.usermodel;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import java.awt.*;
import java.awt.image.ImageObserver;
import java.text.AttributedCharacterIterator;
/**
* Translates Graphics calls into escher calls. The translation is lossy so
* many features are not supported and some just aren't implemented yet. If
* in doubt test the specific calls you wish to make. Graphics calls are
* always performed into an EscherGroup so one will need to be created.
*
* Important:
*
* One important concept worth considering is that of font size. One of the
* difficulties in converting Graphics calls into escher drawing calls is that
* Excel does not have the concept of absolute pixel positions. It measures
* it's cell widths in 'characters' and the cell heights in points.
* Unfortunately it's not defined exactly what a type of character it's
* measuring. Presumably this is due to the fact that the Excel will be
* using different fonts on different platforms or even within the same
* platform.
*
* Because of this constraint we've had to calculate the
* verticalPointsPerPixel. This the amount the font should be scaled by when
* you issue commands such as drawString(). A good way to calculate this
* is to use the follow formula:
*
*
* multipler = groupHeightInPoints / heightOfGroup
*
*
* The height of the group is calculated fairly simply by calculating the
* difference between the y coordinates of the bounding box of the shape. The
* height of the group can be calculated by using a convenience called
* HSSFClientAnchor.getAnchorHeightInPoints().
*
*
* @author Glen Stampoultzis (glens at apache.org)
*/
public class EscherGraphics
extends Graphics
{
private HSSFShapeGroup escherGroup;
private HSSFWorkbook workbook;
private float verticalPointsPerPixel = 1.0f;
private float verticalPixelsPerPoint;
private Color foreground;
private Color background = Color.white;
private Font font;
private static POILogger logger = POILogFactory.getLogger(EscherGraphics.class);
/**
* Construct an escher graphics object.
*
* @param escherGroup The escher group to write the graphics calls into.
* @param workbook The workbook we are using.
* @param forecolor The foreground color to use as default.
* @param verticalPointsPerPixel The font multiplier. (See class description for information on how this works.).
*/
public EscherGraphics(HSSFShapeGroup escherGroup, HSSFWorkbook workbook, Color forecolor, float verticalPointsPerPixel )
{
this.escherGroup = escherGroup;
this.workbook = workbook;
this.verticalPointsPerPixel = verticalPointsPerPixel;
this.verticalPixelsPerPoint = 1 / verticalPointsPerPixel;
this.font = new Font("Arial", 0, 10);
this.foreground = forecolor;
// background = backcolor;
}
/**
* Constructs an escher graphics object.
*
* @param escherGroup The escher group to write the graphics calls into.
* @param workbook The workbook we are using.
* @param foreground The foreground color to use as default.
* @param verticalPointsPerPixel The font multiplier. (See class description for information on how this works.).
* @param font The font to use.
*/
EscherGraphics( HSSFShapeGroup escherGroup, HSSFWorkbook workbook, Color foreground, Font font, float verticalPointsPerPixel )
{
this.escherGroup = escherGroup;
this.workbook = workbook;
this.foreground = foreground;
// this.background = background;
this.font = font;
this.verticalPointsPerPixel = verticalPointsPerPixel;
this.verticalPixelsPerPoint = 1 / verticalPointsPerPixel;
}
// /**
// * Constructs an escher graphics object.
// *
// * @param escherGroup The escher group to write the graphics calls into.
// * @param workbook The workbook we are using.
// * @param forecolor The default foreground color.
// */
// public EscherGraphics( HSSFShapeGroup escherGroup, HSSFWorkbook workbook, Color forecolor)
// {
// this(escherGroup, workbook, forecolor, 1.0f);
// }
public void clearRect(int x, int y, int width, int height)
{
Color color = foreground;
setColor(background);
fillRect(x,y,width,height);
setColor(color);
}
public void clipRect(int x, int y, int width, int height)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"clipRect not supported");
}
public void copyArea(int x, int y, int width, int height, int dx, int dy)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"copyArea not supported");
}
public Graphics create()
{
EscherGraphics g = new EscherGraphics(escherGroup, workbook,
foreground, font, verticalPointsPerPixel );
return g;
}
public void dispose()
{
}
public void drawArc(int x, int y, int width, int height,
int startAngle, int arcAngle)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawArc not supported");
}
public boolean drawImage(Image img,
int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2,
Color bgcolor,
ImageObserver observer)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawImage not supported");
return true;
}
public boolean drawImage(Image img,
int dx1, int dy1, int dx2, int dy2,
int sx1, int sy1, int sx2, int sy2,
ImageObserver observer)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawImage not supported");
return true;
}
public boolean drawImage(Image image, int i, int j, int k, int l, Color color, ImageObserver imageobserver)
{
return drawImage(image, i, j, i + k, j + l, 0, 0, image.getWidth(imageobserver), image.getHeight(imageobserver), color, imageobserver);
}
public boolean drawImage(Image image, int i, int j, int k, int l, ImageObserver imageobserver)
{
return drawImage(image, i, j, i + k, j + l, 0, 0, image.getWidth(imageobserver), image.getHeight(imageobserver), imageobserver);
}
public boolean drawImage(Image image, int i, int j, Color color, ImageObserver imageobserver)
{
return drawImage(image, i, j, image.getWidth(imageobserver), image.getHeight(imageobserver), color, imageobserver);
}
public boolean drawImage(Image image, int i, int j, ImageObserver imageobserver)
{
return drawImage(image, i, j, image.getWidth(imageobserver), image.getHeight(imageobserver), imageobserver);
}
public void drawLine(int x1, int y1, int x2, int y2)
{
drawLine(x1,y1,x2,y2,0);
}
public void drawLine(int x1, int y1, int x2, int y2, int width)
{
HSSFSimpleShape shape = escherGroup.createShape(new HSSFChildAnchor(x1, y1, x2, y2) );
shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_LINE);
shape.setLineWidth(width);
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
}
public void drawOval(int x, int y, int width, int height)
{
HSSFSimpleShape shape = escherGroup.createShape(new HSSFChildAnchor(x,y,x+width,y+height) );
shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);
shape.setLineWidth(0);
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
shape.setNoFill(true);
}
public void drawPolygon(int xPoints[], int yPoints[],
int nPoints)
{
int right = findBiggest(xPoints);
int bottom = findBiggest(yPoints);
int left = findSmallest(xPoints);
int top = findSmallest(yPoints);
HSSFPolygon shape = escherGroup.createPolygon(new HSSFChildAnchor(left,top,right,bottom) );
shape.setPolygonDrawArea(right - left, bottom - top);
shape.setPoints(addToAll(xPoints, -left), addToAll(yPoints, -top));
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
shape.setLineWidth(0);
shape.setNoFill(true);
}
private int[] addToAll( int[] values, int amount )
{
int[] result = new int[values.length];
for ( int i = 0; i < values.length; i++ )
result[i] = values[i] + amount;
return result;
}
public void drawPolyline(int xPoints[], int yPoints[],
int nPoints)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawPolyline not supported");
}
public void drawRect(int x, int y, int width, int height)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawRect not supported");
}
public void drawRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawRoundRect not supported");
}
public void drawString(String str, int x, int y)
{
if (str == null || str.equals(""))
return;
Font excelFont = font;
if ( font.getName().equals( "SansSerif" ) )
{
excelFont = new Font( "Arial", font.getStyle(), (int) ( font.getSize() / verticalPixelsPerPoint ) );
}
else
{
excelFont = new Font( font.getName(), font.getStyle(), (int) ( font.getSize() / verticalPixelsPerPoint ));
}
FontDetails d = StaticFontMetrics.getFontDetails( excelFont );
int width = d.getStringWidth( str ) * 8 + 12;
int height = (int) ( ( font.getSize() / verticalPixelsPerPoint ) + 6 ) * 2;
y -= ( font.getSize() / verticalPixelsPerPoint ) + 2 * verticalPixelsPerPoint; // we want to draw the shape from the top-left
HSSFTextbox textbox = escherGroup.createTextbox( new HSSFChildAnchor( x, y, x + width, y + height ) );
textbox.setNoFill( true );
textbox.setLineStyle( HSSFShape.LINESTYLE_NONE );
HSSFRichTextString s = new HSSFRichTextString( str );
HSSFFont hssfFont = matchFont( excelFont );
s.applyFont( hssfFont );
textbox.setString( s );
}
private HSSFFont matchFont( Font font )
{
HSSFColor hssfColor = workbook.getCustomPalette()
.findColor((byte)foreground.getRed(), (byte)foreground.getGreen(), (byte)foreground.getBlue());
if (hssfColor == null)
hssfColor = workbook.getCustomPalette().findSimilarColor((byte)foreground.getRed(), (byte)foreground.getGreen(), (byte)foreground.getBlue());
boolean bold = (font.getStyle() & Font.BOLD) != 0;
boolean italic = (font.getStyle() & Font.ITALIC) != 0;
HSSFFont hssfFont = workbook.findFont(bold ? HSSFFont.BOLDWEIGHT_BOLD : 0,
hssfColor.getIndex(),
(short)(font.getSize() * 20),
font.getName(),
italic,
false,
(short)0,
(byte)0);
if (hssfFont == null)
{
hssfFont = workbook.createFont();
hssfFont.setBoldweight(bold ? HSSFFont.BOLDWEIGHT_BOLD : 0);
hssfFont.setColor(hssfColor.getIndex());
hssfFont.setFontHeight((short)(font.getSize() * 20));
hssfFont.setFontName(font.getName());
hssfFont.setItalic(italic);
hssfFont.setStrikeout(false);
hssfFont.setTypeOffset((short) 0);
hssfFont.setUnderline((byte) 0);
}
return hssfFont;
}
public void drawString(AttributedCharacterIterator iterator,
int x, int y)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"drawString not supported");
}
public void fillArc(int x, int y, int width, int height,
int startAngle, int arcAngle)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"fillArc not supported");
}
public void fillOval(int x, int y, int width, int height)
{
HSSFSimpleShape shape = escherGroup.createShape(new HSSFChildAnchor( x, y, x + width, y + height ) );
shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);
shape.setLineStyle(HSSFShape.LINESTYLE_NONE);
shape.setFillColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
}
/**
* Fills a (closed) polygon, as defined by a pair of arrays, which
* hold the x and y coordinates.
*
* This draws the polygon, with nPoint line segments.
* The first nPoint - 1 line segments are
* drawn between sequential points
* (xPoints[i],yPoints[i],xPoints[i+1],yPoints[i+1]).
* The final line segment is a closing one, from the last point to
* the first (assuming they are different).
*
* The area inside of the polygon is defined by using an
* even-odd fill rule (also known as the alternating rule), and
* the area inside of it is filled.
* @param xPoints array of the x coordinates.
* @param yPoints array of the y coordinates.
* @param nPoints the total number of points in the polygon.
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
*/
public void fillPolygon(int xPoints[], int yPoints[],
int nPoints)
{
int right = findBiggest(xPoints);
int bottom = findBiggest(yPoints);
int left = findSmallest(xPoints);
int top = findSmallest(yPoints);
HSSFPolygon shape = escherGroup.createPolygon(new HSSFChildAnchor(left,top,right,bottom) );
shape.setPolygonDrawArea(right - left, bottom - top);
shape.setPoints(addToAll(xPoints, -left), addToAll(yPoints, -top));
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
shape.setFillColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
}
private int findBiggest( int[] values )
{
int result = Integer.MIN_VALUE;
for ( int i = 0; i < values.length; i++ )
{
if (values[i] > result)
result = values[i];
}
return result;
}
private int findSmallest( int[] values )
{
int result = Integer.MAX_VALUE;
for ( int i = 0; i < values.length; i++ )
{
if (values[i] < result)
result = values[i];
}
return result;
}
public void fillRect(int x, int y, int width, int height)
{
HSSFSimpleShape shape = escherGroup.createShape(new HSSFChildAnchor( x, y, x + width, y + height ) );
shape.setShapeType(HSSFSimpleShape.OBJECT_TYPE_RECTANGLE);
shape.setLineStyle(HSSFShape.LINESTYLE_NONE);
shape.setFillColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
shape.setLineStyleColor(foreground.getRed(), foreground.getGreen(), foreground.getBlue());
}
public void fillRoundRect(int x, int y, int width, int height,
int arcWidth, int arcHeight)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"fillRoundRect not supported");
}
public Shape getClip()
{
return getClipBounds();
}
public Rectangle getClipBounds()
{
return null;
}
@SuppressWarnings("deprecation")
public Rectangle getClipRect()
{
return getClipBounds();
}
public Color getColor()
{
return foreground;
}
public Font getFont()
{
return font;
}
@SuppressWarnings("deprecation")
public FontMetrics getFontMetrics(Font f)
{
return Toolkit.getDefaultToolkit().getFontMetrics(f);
}
public void setClip(int x, int y, int width, int height)
{
setClip(new Rectangle(x,y,width,height));
}
public void setClip(Shape shape)
{
// ignore... not implemented
}
public void setColor(Color color)
{
foreground = color;
}
public void setFont(Font f)
{
font = f;
}
public void setPaintMode()
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"setPaintMode not supported");
}
public void setXORMode(Color color)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"setXORMode not supported");
}
public void translate(int x, int y)
{
if (logger.check( POILogger.WARN ))
logger.log(POILogger.WARN,"translate not supported");
}
public Color getBackground()
{
return background;
}
public void setBackground( Color background )
{
this.background = background;
}
HSSFShapeGroup getEscherGraphics()
{
return escherGroup;
}
}