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BasicExpressionUI.java
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BasicExpressionUI.java
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/*
Copyright 2009 Benjamin Samuel. All rights reserved.
This file is part of VisualExpressionBuilder, a component for the
Swing UI for Java. Java is a trademark of Sun.
VisualExpressionBuilder is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as published
by the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
VisualExpressionBuilder is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along
with VisualExpressionBuilder, in the file COPYING in the root directory of
the distribution. If not, see <http://www.gnu.org/licenses/>.
**/
package net.samuel.ben;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
public class BasicExpressionUI extends ExpressionUI {
public BasicExpressionUI() { }
public Stroke borderStroke() { return _stroke; }
public double heteroborderSpace() { return 3.0; }
public Paint borderPaint() { return Color.black; }
public Paint areaPaint() { return Color.white; }
private final static Font _labelFont =
new Font("Helvetica", Font.PLAIN, 12);
private final static BasicStroke _stroke = new BasicStroke((float) 0.75);
public Font labelFont() { return _labelFont; }
private static final double SQRT2 = Math.sqrt(2.0);
/**
* Bounding box for content drawn on a Graphics2D object
* Includes padding, and for arc-based nodes
* includes space for arc.
* Does *not* include space for borders or nibs.
**/
public void contentArea(Graphics2D g, Node n, Rectangle2D r) {
NodeStyle ns = n.getStyle();
Rectangle2D b = labelFont().getStringBounds(n.getLabel(),
g.getFontRenderContext());
/* Strictly, it's an semiellipse. We need the ellipse to be large
enough that the label + padding doesn't touch any part of it.
To circumscribe a square with a circle, assume the diameter
runs corner to corner, cutting the square into two isoceles right
triangles. By Pythagorean, d = sqrt(2 * s^2), so d = sqrt(2) * s.
Given that an ellipse is simply a streched circle a similarly
stretched square will still fit.
Our semiellipse is just half of an ellipse, but our rectangle is
also just half of a larger rectangle so we don't need to do
anything about that.**/
double ellipsePad = ns == NodeStyle.semicircle_top || ns == NodeStyle.semicircle_bottom
? SQRT2 : 1.0;
r.setRect(b.getX(), b.getY(),
(b.getWidth() + 2.0) * ellipsePad,
(b.getHeight() + 2.0) * ellipsePad);
}
/**
* thickness of the border with the senior sibling
* this is west border width in a LTR UI
**/
public double seniorBorderSize(Graphics2D g, Node n, Rectangle2D content)
{
switch(n.getStyle()) {
case squiggly_sides:
return 2.0 * squigglyAmplitude() + _stroke.getLineWidth();
case straight_sides:
return _stroke.getLineWidth();
case pointy_sides:
// pointyangle is twice the angle of a right triangle whose
// opposite side is half our height and whose adjacent is the
// width we're interested in.
// tan(pointy/2) = height/2 / return
return content.getHeight() / 2.0 / Math.tan(pointyAngle());
case semicircle_top:
case semicircle_bottom:
return 0.0;
}
throw new AssertionError();
}
/**
* thickness of the border with the junior sibling
* this is east border width in a LTR UI
**/
public double juniorBorderSize(Graphics2D g, Node n, Rectangle2D content)
{
return seniorBorderSize(g, n, content);
}
/**
* thickness of the border with the children
* this is the north border height in a LTR UI
**/
public double childrenBorderSize(Graphics2D g, Node n,
Rectangle2D content)
{
switch(n.getStyle()) {
case squiggly_sides:
case semicircle_bottom:
return 2.0 * squigglyAmplitude() + _stroke.getLineWidth();
case pointy_sides:
// Check if this is a capture or a recall
return n.getIns().isEmpty() ? _stroke.getLineWidth() :
2.0 * squigglyAmplitude() + _stroke.getLineWidth();
case semicircle_top:
return 0.0;
case straight_sides:
return _stroke.getLineWidth();
}
throw new AssertionError();
}
/**
* thickness of the border with the parent
* this is the south border height in a LTR UI
**/
public double parentBorderSize(Graphics2D g, Node n, Rectangle2D content)
{
switch(n.getStyle()) {
case squiggly_sides:
case semicircle_top:
return 2.0 * squigglyAmplitude() + _stroke.getLineWidth();
case straight_sides:
case pointy_sides:
// Check if this is a capture or a recall
return n.getIns().isEmpty() ? _stroke.getLineWidth() :
2.0 * squigglyAmplitude() + _stroke.getLineWidth();
case semicircle_bottom:
return 0.0;
}
throw new AssertionError();
}
/**
* distance the nib descends
* this is the height of the north descender area in a LTR UI
**/
public double nibDescent() {
return 12.0;
}
/**
* width of the nib
* this is the width of the descender itself in a LTR UI
**/
public double nibExtent() {
return 8.0;
}
/**
* minimal spacing between nibs
* This will probably never matter because a node with any text will be
* wider than the nib extent.
* This is padding around the nib. Between two nibs, there will be >= this
* value * 2, between a nib and a corner, there will be >= this value.
**/
public double nibSpacing() {
return 2.0;
}
// This should be small, 2 or 3 pixels. Note the actual border width is
// twice this.
public double squigglyAmplitude() { return 2.0; }
// The squiggles are a rough approximation of a sine wave
public double squigglyWavelength() { return 32.0; }
/**
* Pointy sides are essentially the same as a less-than or greater-than
* sign. This is the interior angle used to determine the width of the
* sides column, i.e. width = (height / 2) / tan(pointyAngle / 2)
* The return value should be in radians.
**/
public double pointyAngle() { return Math.toRadians(160); }
@Override
public Paint areaPaint(Node n) {
// TODO Auto-generated method stub
return null;
}
}