/**

* $Id: mxDefaultTextShape.java,v 1.10 2011/03/23 13:30:22 gaudenz Exp $

* Copyright (c) 2010, Gaudenz Alder, David Benson

*/

package com.mxgraph.shape;

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.util.Map;

import com.mxgraph.canvas.mxGraphics2DCanvas;

import com.mxgraph.util.mxConstants;

import com.mxgraph.util.mxUtils;

import com.mxgraph.view.mxCellState;

public class mxDefaultTextShape implements mxITextShape

{

/**

*

*/

public void paintShape(mxGraphics2DCanvas canvas, String text,

mxCellState state, Map<String, Object> style)

{

Rectangle rect = state.getLabelBounds().getRectangle();

Graphics2D g = canvas.getGraphics();

if (g.getClipBounds() == null || g.getClipBounds().intersects(rect))

{

boolean horizontal = mxUtils.isTrue(style,

mxConstants.STYLE_HORIZONTAL, true);

double scale = canvas.getScale();

int x = rect.x;

int y = rect.y;

int w = rect.width;

int h = rect.height;

if (!horizontal)

{

g.rotate(-Math.PI / 2, x + w / 2, y + h / 2);

g.translate(w / 2 - h / 2, h / 2 - w / 2);

}

Color fontColor = mxUtils.getColor(style,

mxConstants.STYLE_FONTCOLOR, Color.black);

g.setColor(fontColor);

// Shifts the y-coordinate down by the ascent plus a workaround

// for the line not starting at the exact vertical location

Font scaledFont = mxUtils.getFont(style, scale);

g.setFont(scaledFont);

int fontSize = mxUtils.getInt(style, mxConstants.STYLE_FONTSIZE,

mxConstants.DEFAULT_FONTSIZE);

FontMetrics fm = g.getFontMetrics();

int scaledFontSize = scaledFont.getSize();

double fontScaleFactor = ((double) scaledFontSize)

/ ((double) fontSize);

// This factor is the amount by which the font is smaller/

// larger than we expect for the given scale. 1 means it's

// correct, 0.8 means the font is 0.8 the size we expected

// when scaled, etc.

double fontScaleRatio = fontScaleFactor / scale;

// The y position has to be moved by (1 - ratio) * height / 2

y += 2 * fm.getMaxAscent() - fm.getHeight()

+ mxConstants.LABEL_INSET * scale;

Object vertAlign = mxUtils.getString(style,

mxConstants.STYLE_VERTICAL_ALIGN, mxConstants.ALIGN_MIDDLE);

double vertAlignProportion = 0.5;

if (vertAlign.equals(mxConstants.ALIGN_TOP))

{

vertAlignProportion = 0;

}

else if (vertAlign.equals(mxConstants.ALIGN_BOTTOM))

{

vertAlignProportion = 1.0;

}

y += (1.0 - fontScaleRatio) * h * vertAlignProportion;

// Gets the alignment settings

Object align = mxUtils.getString(style, mxConstants.STYLE_ALIGN,

mxConstants.ALIGN_CENTER);

if (align.equals(mxConstants.ALIGN_LEFT))

{

x += mxConstants.LABEL_INSET * scale;

}

else if (align.equals(mxConstants.ALIGN_RIGHT))

{

x -= mxConstants.LABEL_INSET * scale;

}

// Draws the text line by line

String[] lines = text.split("\n");

for (int i = 0; i < lines.length; i++)

{

int dx = 0;

if (align.equals(mxConstants.ALIGN_CENTER))

{

int sw = fm.stringWidth(lines[i]);

if (horizontal)

{

dx = (w - sw) / 2;

}

else

{

dx = (h - sw) / 2;

}

}

else if (align.equals(mxConstants.ALIGN_RIGHT))

{

int sw = fm.stringWidth(lines[i]);

dx = ((horizontal) ? w : h) - sw;

}

g.drawString(lines[i], x + dx, y);

postProcessLine(text, lines[i], fm, canvas, x + dx, y);

y += fm.getHeight() + mxConstants.LINESPACING;

}

}

}

/**

* Hook to add functionality after a line has been drawn

* @param text the entire label text

* @param line the line at the specified location

* @param fm the text font metrics

* @param canvas the canvas object currently being painted to

* @param x the x co-ord of the baseline of the text line

* @param y the y co-ord of the baseline of the text line

*/

protected void postProcessLine(String text, String line, FontMetrics fm, mxGraphics2DCanvas canvas, int x, int y){}

}