/**
* Copyright (c) 2010-2012, JGraph Ltd
*/
package com.mxgraph.shape;
import java.util.Map;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import com.mxgraph.canvas.mxGraphics2DCanvas;
import com.mxgraph.canvas.mxGraphicsCanvas2D;
import com.mxgraph.util.mxConstants;
import com.mxgraph.util.mxPoint;
import com.mxgraph.util.mxRectangle;
import com.mxgraph.util.mxUtils;
import com.mxgraph.view.mxCellState;
/**
* Implements a stencil for the given XML definition. This class implements the mxGraph
* stencil schema.
*/
public class mxStencil implements mxIShape
{
/**
* Holds the top-level node of the stencil definition.
*/
protected Element desc;
/**
* Holds the aspect of the shape. Default is "auto".
*/
protected String aspect = null;
/**
* Holds the width of the shape. Default is 100.
*/
protected double w0 = 100;
/**
* Holds the height of the shape. Default is 100.
*/
protected double h0 = 100;
/**
* Holds the XML node with the stencil description.
*/
protected Element bgNode = null;
/**
* Holds the XML node with the stencil description.
*/
protected Element fgNode = null;
/**
* Holds the strokewidth direction from the description.
*/
protected String strokewidth = null;
/**
* Holds the last x-position of the cursor.
*/
protected double lastMoveX = 0;
/**
* Holds the last y-position of the cursor.
*/
protected double lastMoveY = 0;
/**
* Constructs a new stencil for the given mxGraph shape description.
*/
public mxStencil(Element description)
{
setDescription(description);
}
/**
* Returns the description.
*/
public Element getDescription()
{
return desc;
}
/**
* Sets the description.
*/
public void setDescription(Element value)
{
desc = value;
parseDescription();
}
/**
* Creates the canvas for rendering the stencil.
*/
protected mxGraphicsCanvas2D createCanvas(mxGraphics2DCanvas gc)
{
return new mxGraphicsCanvas2D(gc.getGraphics());
}
/**
* Paints the stencil for the given state.
*/
public void paintShape(mxGraphics2DCanvas gc, mxCellState state)
{
Map<String, Object> style = state.getStyle();
mxGraphicsCanvas2D canvas = createCanvas(gc);
double rotation = mxUtils.getDouble(style, mxConstants.STYLE_ROTATION,
0);
String direction = mxUtils.getString(style,
mxConstants.STYLE_DIRECTION, null);
// Default direction is east (ignored if rotation exists)
if (direction != null)
{
if (direction.equals("north"))
{
rotation += 270;
}
else if (direction.equals("west"))
{
rotation += 180;
}
else if (direction.equals("south"))
{
rotation += 90;
}
}
// New styles for shape flipping the stencil
boolean flipH = mxUtils.isTrue(style, mxConstants.STYLE_STENCIL_FLIPH,
false);
boolean flipV = mxUtils.isTrue(style, mxConstants.STYLE_STENCIL_FLIPV,
false);
if (flipH && flipV)
{
rotation += 180;
flipH = false;
flipV = false;
}
// Saves the global state for each cell
canvas.save();
// Adds rotation and horizontal/vertical flipping
rotation = rotation % 360;
if (rotation != 0 || flipH || flipV)
{
canvas.rotate(rotation, flipH, flipV, state.getCenterX(),
state.getCenterY());
}
// Note: Overwritten in mxStencil.paintShape (can depend on aspect)
double scale = state.getView().getScale();
double sw = mxUtils.getDouble(style, mxConstants.STYLE_STROKEWIDTH, 1)
* scale;
canvas.setStrokeWidth(sw);
double alpha = mxUtils.getDouble(style, mxConstants.STYLE_OPACITY, 100) / 100;
String gradientColor = mxUtils.getString(style,
mxConstants.STYLE_GRADIENTCOLOR, null);
// Converts colors with special keyword none to null
if (gradientColor != null && gradientColor.equals(mxConstants.NONE))
{
gradientColor = null;
}
String fillColor = mxUtils.getString(style,
mxConstants.STYLE_FILLCOLOR, null);
if (fillColor != null && fillColor.equals(mxConstants.NONE))
{
fillColor = null;
}
String strokeColor = mxUtils.getString(style,
mxConstants.STYLE_STROKECOLOR, null);
if (strokeColor != null && strokeColor.equals(mxConstants.NONE))
{
strokeColor = null;
}
// Draws the shadow if the fillColor is not transparent
if (mxUtils.isTrue(style, mxConstants.STYLE_SHADOW, false))
{
drawShadow(canvas, state, rotation, flipH, flipV, state, alpha, fillColor != null);
}
canvas.setAlpha(alpha);
// Sets the dashed state
if (mxUtils.isTrue(style, mxConstants.STYLE_DASHED, false))
{
canvas.setDashed(true);
}
// Draws background and foreground
if (strokeColor != null || fillColor != null)
{
if (strokeColor != null)
{
canvas.setStrokeColor(strokeColor);
}
if (fillColor != null)
{
if (gradientColor != null
&& !gradientColor.equals("transparent"))
{
canvas.setGradient(fillColor, gradientColor, state.getX(),
state.getY(), state.getWidth(), state.getHeight(),
direction, 1, 1);
}
else
{
canvas.setFillColor(fillColor);
}
}
// Draws background and foreground of shape
drawShape(canvas, state, state, true);
drawShape(canvas, state, state, false);
}
}
/**
* Draws the shadow.
*/
protected void drawShadow(mxGraphicsCanvas2D canvas, mxCellState state, double rotation, boolean flipH,
boolean flipV, mxRectangle bounds, double alpha, boolean filled)
{
// Requires background in generic shape for shadow, looks like only one
// fillAndStroke is allowed per current path, try working around that
// Computes rotated shadow offset
double rad = rotation * Math.PI / 180;
double cos = Math.cos(-rad);
double sin = Math.sin(-rad);
mxPoint offset = mxUtils.getRotatedPoint(new mxPoint(mxConstants.SHADOW_OFFSETX, mxConstants.SHADOW_OFFSETY), cos, sin);
if (flipH)
{
offset.setX(offset.getX() * -1);
}
if (flipV)
{
offset.setY(offset.getY() * -1);
}
// TODO: Use save/restore instead of negative offset to restore (requires fix for HTML canvas)
canvas.translate(offset.getX(), offset.getY());
// Returns true if a shadow has been painted (path has been created)
if (drawShape(canvas, state, bounds, true))
{
canvas.setAlpha(mxConstants.STENCIL_SHADOW_OPACITY * alpha);
// TODO: Implement new shadow
//canvas.shadow(mxConstants.STENCIL_SHADOWCOLOR, filled);
}
canvas.translate(-offset.getX(), -offset.getY());
}
/**
* Draws this stencil inside the given bounds.
*/
public boolean drawShape(mxGraphicsCanvas2D canvas, mxCellState state,
mxRectangle bounds, boolean background)
{
Element elt = (background) ? bgNode : fgNode;
if (elt != null)
{
String direction = mxUtils.getString(state.getStyle(),
mxConstants.STYLE_DIRECTION, null);
mxRectangle aspect = computeAspect(state, bounds, direction);
double minScale = Math.min(aspect.getWidth(), aspect.getHeight());
double sw = strokewidth.equals("inherit") ? mxUtils.getDouble(
state.getStyle(), mxConstants.STYLE_STROKEWIDTH, 1)
* state.getView().getScale() : Double
.parseDouble(strokewidth) * minScale;
lastMoveX = 0;
lastMoveY = 0;
canvas.setStrokeWidth(sw);
Node tmp = elt.getFirstChild();
while (tmp != null)
{
if (tmp.getNodeType() == Node.ELEMENT_NODE)
{
drawElement(canvas, state, (Element) tmp, aspect);
}
tmp = tmp.getNextSibling();
}
return true;
}
return false;
}
/**
* Returns a rectangle that contains the offset in x and y and the horizontal
* and vertical scale in width and height used to draw this shape inside the
* given rectangle.
*/
protected mxRectangle computeAspect(mxCellState state, mxRectangle bounds,
String direction)
{
double x0 = bounds.getX();
double y0 = bounds.getY();
double sx = bounds.getWidth() / w0;
double sy = bounds.getHeight() / h0;
boolean inverse = (direction != null && (direction.equals("north") || direction
.equals("south")));
if (inverse)
{
sy = bounds.getWidth() / h0;
sx = bounds.getHeight() / w0;
double delta = (bounds.getWidth() - bounds.getHeight()) / 2;
x0 += delta;
y0 -= delta;
}
if (aspect.equals("fixed"))
{
sy = Math.min(sx, sy);
sx = sy;
// Centers the shape inside the available space
if (inverse)
{
x0 += (bounds.getHeight() - this.w0 * sx) / 2;
y0 += (bounds.getWidth() - this.h0 * sy) / 2;
}
else
{
x0 += (bounds.getWidth() - this.w0 * sx) / 2;
y0 += (bounds.getHeight() - this.h0 * sy) / 2;
}
}
return new mxRectangle(x0, y0, sx, sy);
}
/**
* Drawsthe given element.
*/
protected void drawElement(mxGraphicsCanvas2D canvas, mxCellState state,
Element node, mxRectangle aspect)
{
String name = node.getNodeName();
double x0 = aspect.getX();
double y0 = aspect.getY();
double sx = aspect.getWidth();
double sy = aspect.getHeight();
double minScale = Math.min(sx, sy);
// LATER: Move to lookup table
if (name.equals("save"))
{
canvas.save();
}
else if (name.equals("restore"))
{
canvas.restore();
}
else if (name.equals("path"))
{
canvas.begin();
// Renders the elements inside the given path
Node childNode = node.getFirstChild();
while (childNode != null)
{
if (childNode.getNodeType() == Node.ELEMENT_NODE)
{
drawElement(canvas, state, (Element) childNode, aspect);
}
childNode = childNode.getNextSibling();
}
}
else if (name.equals("close"))
{
canvas.close();
}
else if (name.equals("move"))
{
lastMoveX = x0 + getDouble(node, "x") * sx;
lastMoveY = y0 + getDouble(node, "y") * sy;
canvas.moveTo(lastMoveX, lastMoveY);
}
else if (name.equals("line"))
{
lastMoveX = x0 + getDouble(node, "x") * sx;
lastMoveY = y0 + getDouble(node, "y") * sy;
canvas.lineTo(lastMoveX, lastMoveY);
}
else if (name.equals("quad"))
{
lastMoveX = x0 + getDouble(node, "x2") * sx;
lastMoveY = y0 + getDouble(node, "y2") * sy;
canvas.quadTo(x0 + getDouble(node, "x1") * sx,
y0 + getDouble(node, "y1") * sy, lastMoveX, lastMoveY);
}
else if (name.equals("curve"))
{
lastMoveX = x0 + getDouble(node, "x3") * sx;
lastMoveY = y0 + getDouble(node, "y3") * sy;
canvas.curveTo(x0 + getDouble(node, "x1") * sx,
y0 + getDouble(node, "y1") * sy, x0 + getDouble(node, "x2")
* sx, y0 + getDouble(node, "y2") * sy, lastMoveX,
lastMoveY);
}
else if (name.equals("arc"))
{
// Arc from stencil is turned into curves in image output
double r1 = getDouble(node, "rx") * sx;
double r2 = getDouble(node, "ry") * sy;
double angle = getDouble(node, "x-axis-rotation");
double largeArcFlag = getDouble(node, "large-arc-flag");
double sweepFlag = getDouble(node, "sweep-flag");
double x = x0 + getDouble(node, "x") * sx;
double y = y0 + getDouble(node, "y") * sy;
double[] curves = mxUtils.arcToCurves(this.lastMoveX,
this.lastMoveY, r1, r2, angle, largeArcFlag, sweepFlag, x,
y);
for (int i = 0; i < curves.length; i += 6)
{
canvas.curveTo(curves[i], curves[i + 1], curves[i + 2],
curves[i + 3], curves[i + 4], curves[i + 5]);
lastMoveX = curves[i + 4];
lastMoveY = curves[i + 5];
}
}
else if (name.equals("rect"))
{
canvas.rect(x0 + getDouble(node, "x") * sx,
y0 + getDouble(node, "y") * sy, getDouble(node, "w") * sx,
getDouble(node, "h") * sy);
}
else if (name.equals("roundrect"))
{
double arcsize = getDouble(node, "arcsize");
if (arcsize == 0)
{
arcsize = mxConstants.RECTANGLE_ROUNDING_FACTOR * 100;
}
double w = getDouble(node, "w") * sx;
double h = getDouble(node, "h") * sy;
double factor = arcsize / 100;
double r = Math.min(w * factor, h * factor);
canvas.roundrect(x0 + getDouble(node, "x") * sx,
y0 + getDouble(node, "y") * sy, getDouble(node, "w") * sx,
getDouble(node, "h") * sy, r, r);
}
else if (name.equals("ellipse"))
{
canvas.ellipse(x0 + getDouble(node, "x") * sx,
y0 + getDouble(node, "y") * sy, getDouble(node, "w") * sx,
getDouble(node, "h") * sy);
}
else if (name.equals("image"))
{
String src = evaluateAttribute(node, "src", state);
canvas.image(x0 + getDouble(node, "x") * sx,
y0 + getDouble(node, "y") * sy, getDouble(node, "w") * sx,
getDouble(node, "h") * sy, src, false,
getString(node, "flipH", "0").equals("1"),
getString(node, "flipV", "0").equals("1"));
}
else if (name.equals("text"))
{
String str = evaluateAttribute(node, "str", state);
double rotation = getString(node, "vertical", "0").equals("1") ? -90 : 0;
canvas.text(x0 + getDouble(node, "x") * sx,
y0 + getDouble(node, "y") * sy, 0, 0, str,
node.getAttribute("align"), node.getAttribute("valign"),
false, "", null, false, rotation);
}
else if (name.equals("include-shape"))
{
mxStencil stencil = mxStencilRegistry.getStencil(node
.getAttribute("name"));
if (stencil != null)
{
double x = x0 + getDouble(node, "x") * sx;
double y = y0 + getDouble(node, "y") * sy;
double w = getDouble(node, "w") * sx;
double h = getDouble(node, "h") * sy;
mxRectangle tmp = new mxRectangle(x, y, w, h);
stencil.drawShape(canvas, state, tmp, true);
stencil.drawShape(canvas, state, tmp, false);
}
}
else if (name.equals("fillstroke"))
{
canvas.fillAndStroke();
}
else if (name.equals("fill"))
{
canvas.fill();
}
else if (name.equals("stroke"))
{
canvas.stroke();
}
else if (name.equals("strokewidth"))
{
canvas.setStrokeWidth(getDouble(node, "width") * minScale);
}
else if (name.equals("dashed"))
{
canvas.setDashed(node.getAttribute("dashed") == "1");
}
else if (name.equals("dashpattern"))
{
String value = node.getAttribute("pattern");
if (value != null)
{
String[] tmp = value.split(" ");
StringBuffer pat = new StringBuffer();
for (int i = 0; i < tmp.length; i++)
{
if (tmp[i].length() > 0)
{
pat.append(Double.parseDouble(tmp[i]) * minScale);
pat.append(" ");
}
}
value = pat.toString();
}
canvas.setDashPattern(value);
}
else if (name.equals("strokecolor"))
{
canvas.setStrokeColor(node.getAttribute("color"));
}
else if (name.equals("linecap"))
{
canvas.setLineCap(node.getAttribute("cap"));
}
else if (name.equals("linejoin"))
{
canvas.setLineJoin(node.getAttribute("join"));
}
else if (name.equals("miterlimit"))
{
canvas.setMiterLimit(getDouble(node, "limit"));
}
else if (name.equals("fillcolor"))
{
canvas.setFillColor(node.getAttribute("color"));
}
else if (name.equals("fontcolor"))
{
canvas.setFontColor(node.getAttribute("color"));
}
else if (name.equals("fontstyle"))
{
canvas.setFontStyle(getInt(node, "style", 0));
}
else if (name.equals("fontfamily"))
{
canvas.setFontFamily(node.getAttribute("family"));
}
else if (name.equals("fontsize"))
{
canvas.setFontSize(getDouble(node, "size") * minScale);
}
}
/**
* Returns the given attribute or the default value.
*/
protected int getInt(Element elt, String attribute, int defaultValue)
{
String value = elt.getAttribute(attribute);
if (value != null && value.length() > 0)
{
try
{
defaultValue = (int) Math.floor(Float.parseFloat(value));
}
catch (NumberFormatException e)
{
// ignore
}
}
return defaultValue;
}
/**
* Returns the given attribute or 0.
*/
protected double getDouble(Element elt, String attribute)
{
return getDouble(elt, attribute, 0);
}
/**
* Returns the given attribute or the default value.
*/
protected double getDouble(Element elt, String attribute,
double defaultValue)
{
String value = elt.getAttribute(attribute);
if (value != null && value.length() > 0)
{
try
{
defaultValue = Double.parseDouble(value);
}
catch (NumberFormatException e)
{
// ignore
}
}
return defaultValue;
}
/**
* Returns the given attribute or the default value.
*/
protected String getString(Element elt, String attribute,
String defaultValue)
{
String value = elt.getAttribute(attribute);
if (value != null && value.length() > 0)
{
defaultValue = value;
}
return defaultValue;
}
/**
* Parses the description of this shape.
*/
protected void parseDescription()
{
// LATER: Preprocess nodes for faster painting
fgNode = (Element) desc.getElementsByTagName("foreground").item(0);
bgNode = (Element) desc.getElementsByTagName("background").item(0);
w0 = getDouble(desc, "w", w0);
h0 = getDouble(desc, "h", h0);
// Possible values for aspect are: variable and fixed where
// variable means fill the available space and fixed means
// use w0 and h0 to compute the aspect.
aspect = getString(desc, "aspect", "variable");
// Possible values for strokewidth are all numbers and "inherit"
// where the inherit means take the value from the style (ie. the
// user-defined stroke-width). Note that the strokewidth is scaled
// by the minimum scaling that is used to draw the shape (sx, sy).
strokewidth = getString(desc, "strokewidth", "1");
}
/**
* Gets the attribute for the given name from the given node. If the attribute
* does not exist then the text content of the node is evaluated and if it is
* a function it is invoked with <state> as the only argument and the return
* value is used as the attribute value to be returned.
*/
public String evaluateAttribute(Element elt, String attribute,
mxCellState state)
{
String result = elt.getAttribute(attribute);
if (result == null)
{
// JS functions as text content are currently not supported in Java
}
return result;
}
}