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//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//=============================================================================
package org.uncommons.watchmaker.examples.sudoku;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.border.Border;
import javax.swing.table.DefaultTableCellRenderer;
import org.uncommons.swing.ConfigurableLineBorder;
/**
* Renders Sudoku cells in a JTable. As well as displaying the cell value,
* grid lines are drawn to conform to normal Sudoku conventions and incorrect
* solutions have their invalid cells colour-coded.
* @author Daniel Dyer
*/
class SudokuCellRenderer extends DefaultTableCellRenderer
{
private static final Font VARIABLE_CELL_FONT = new Font("Monospaced", Font.PLAIN, 32);
private static final Font FIXED_CELL_FONT = new Font("Monospaced", Font.BOLD, 34);
private static final Color VARIABLE_TEXT_COLOUR = Color.DARK_GRAY;
private static final Color FIXED_TEXT_COLOUR = Color.BLACK;
private static final Color[] CONFLICT_COLOURS = {Color.WHITE, Color.YELLOW, Color.ORANGE, Color.RED};
private static final Border TOP_BORDER = new ConfigurableLineBorder(true, false, false, false, 1);
private static final Border BOTTOM_BORDER = new ConfigurableLineBorder(false, false, true, false, 1);
private static final Border LEFT_BORDER = new ConfigurableLineBorder(false, true, false, false, 1);
private static final Border RIGHT_BORDER = new ConfigurableLineBorder(false, false, false, true, 1);
private static final Border TOP_LEFT_BORDER = new ConfigurableLineBorder(true, true, false, false, 1);
private static final Border TOP_RIGHT_BORDER = new ConfigurableLineBorder(true, false, false, true, 1);
private static final Border BOTTOM_LEFT_BORDER = new ConfigurableLineBorder(false, true, true, false, 1);
private static final Border BOTTOM_RIGHT_BORDER = new ConfigurableLineBorder(false, false, true, true, 1);
SudokuCellRenderer()
{
setHorizontalAlignment(JLabel.CENTER);
}
@Override
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column)
{
Component component = super.getTableCellRendererComponent(table,
value,
false,
false,
row,
column);
SudokuTableModel model = (SudokuTableModel) table.getModel();
Sudoku sudoku = model.getSudoku();
if (sudoku != null)
{
if (sudoku.isFixed(row, column))
{
component.setFont(FIXED_CELL_FONT);
component.setForeground(FIXED_TEXT_COLOUR);
}
else
{
component.setFont(VARIABLE_CELL_FONT);
component.setForeground(VARIABLE_TEXT_COLOUR);
}
int conflicts = 0;
// Calculate conflicts in columns (there should be no conflicts in rows
// because of the constraints enforced by the evolutionary operators).
for (int i = 0; i < Sudoku.SIZE; i++)
{
if (i != row && model.getValueAt(i, column).equals(value))
{
++conflicts;
}
}
// Calculate conflicts in sub-grid.
int band = row / 3;
int bandStart = band * 3;
int stack = column / 3;
int stackStart = stack * 3;
for (int i = bandStart; i < bandStart + 3; i++)
{
for (int j = stackStart; j < stackStart + 3; j++)
{
if (i != row && j != column && model.getValueAt(i, j).equals(value))
{
++conflicts;
}
}
}
// Color the cell based on how "wrong" it is.
component.setBackground(CONFLICT_COLOURS[Math.min(conflicts, CONFLICT_COLOURS.length - 1)]);
}
else
{
// If the model is in puzzle mode, then all non-null cells are 'givens'.
component.setFont(FIXED_CELL_FONT);
component.setForeground(FIXED_TEXT_COLOUR);
}
((JComponent) component).setBorder(getBorder(row, column));
return component;
}
/**
* Get appropriate border for cell based on its position in the grid.
*/
private Border getBorder(int row, int column)
{
if (row % 3 == 2)
{
switch (column % 3)
{
case 2: return BOTTOM_RIGHT_BORDER;
case 0: return BOTTOM_LEFT_BORDER;
default: return BOTTOM_BORDER;
}
}
else if (row % 3 == 0)
{
switch (column % 3)
{
case 2: return TOP_RIGHT_BORDER;
case 0: return TOP_LEFT_BORDER;
default: return TOP_BORDER;
}
}
switch (column % 3)
{
case 2: return RIGHT_BORDER;
case 0: return LEFT_BORDER;
default: return null;
}
}
}
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