src/zutil/chart/AbstractChart.java

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+/*******************************************************************************
+ * Copyright (c) 2013 Ziver
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ ******************************************************************************/
+package zutil.chart;
+
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.geom.Line2D;
+import java.util.logging.Logger;
+
+import javax.swing.JPanel;
+
+import zutil.log.LogUtil;
+
+public abstract class AbstractChart extends JPanel{
+	private static final Logger logger = LogUtil.getLogger();
+	private static final long serialVersionUID = 1L;
+	
+	/** The offset from the borders of the panel in pixels */
+	public static final int PADDING = 20; 
+	
+	protected ChartData data;
+	protected int width;
+	protected int height;
+	protected Rectangle chartBound;
+
+	
+	
+	protected void paintComponent(Graphics g){
+		Graphics2D g2 = (Graphics2D)g;
+		
+		Rectangle bound = drawScale( g2 );
+		drawChart( g2, bound );
+	}
+	
+	protected Rectangle drawScale(Graphics2D g2){
+		if( data == null )
+			return null;
+		
+		// update values
+		width = this.getWidth();
+		height = this.getHeight();
+		Rectangle bound = new Rectangle();
+		
+		// Values
+		int stepLength = 7;
+		
+		/////// Temp values
+		// Calculate Font sizes 
+		FontMetrics metric = g2.getFontMetrics();
+		int fontHeight = metric.getHeight();
+		int fontXWidth = 0;
+		int fontYWidth = 0;
+		for( Point p : data.getPoints() ){
+			int length = 0;
+			String tmp = data.getXString( p.x );			
+			if( tmp != null ) 	length = metric.stringWidth( tmp );
+			else				length = metric.stringWidth( ""+p.x );
+			fontXWidth = Math.max(length, fontXWidth);
+			
+			tmp = data.getXString( p.y );
+			if( tmp != null ) 	length = metric.stringWidth( tmp );
+			else				length = metric.stringWidth( ""+p.y );
+			fontYWidth = Math.max(length, fontYWidth);
+		}
+		// Calculate origo
+		Point origo = new Point( PADDING+fontYWidth+stepLength, height-PADDING-fontHeight-stepLength );
+		bound.x = (int) (origo.getX()+1);
+		bound.y = PADDING;
+		bound.width = width-bound.x-PADDING;
+		bound.height = (int) (origo.getY()-PADDING-1);
+		// Calculate Axis scales
+		double xScale = (double)(Math.abs(data.getMaxX())+Math.abs(data.getMinX()))/bound.width;
+		double yScale = (double)(Math.abs(data.getMaxY())+Math.abs(data.getMinY()))/bound.height;
+		
+		
+		/////// Draw	
+		// Y Axis
+		g2.draw( new Line2D.Double( origo.getX(), PADDING, origo.getX(), origo.getY() )); 
+		// X Axis
+		g2.draw( new Line2D.Double( origo.getX(), origo.getY(), width-PADDING, origo.getY() ));
+		// Y Axis steps and labels
+		g2.draw( new Line2D.Double( origo.getX(), origo.getY(), origo.getX()-stepLength, origo.getY() ));
+		g2.draw( new Line2D.Double( origo.getX(), PADDING, origo.getX()-stepLength, PADDING ));
+		
+		// X Axis steps and labels
+		g2.draw( new Line2D.Double( width-PADDING, origo.getY(), width-PADDING, origo.getY()+stepLength ));
+		
+		// DEBUG
+		/*
+		g2.setColor(Color.red);
+		g2.drawRect(bound.x, bound.y, bound.width, bound.height);
+		*/
+		return bound;
+	}
+	
+	/**
+	 * This method is called after the chart scale has been drawn. 
+	 * This method will draw the actual chart
+	 * 
+	 * @param 		g		is the Graphics object that will paint the chart
+	 * @param 		bound	is the bounds of the chart, the drawing should not exceed this bound
+	 */
+	protected abstract void drawChart(Graphics2D g2, Rectangle bound);
+	
+	
+	/**
+	 * Sets the data that will be drawn.
+	 * 
+	 * @param 		data		is the data to draw
+	 */
+	public void setChartData(ChartData data){
+		this.data = data;
+	}
+	
+	/**
+	 * Converts a x value to ax pixel coordinate
+	 * 
+	 * @param 		x		is the x data value
+	 * @return				pixel coordinate, or 0 if the chart have not been drawn yet.
+	 */
+	protected int getXCoordinate(int x){
+		return 0;
+	}
+	
+	/**
+	 * Converts a y value to a y pixel coordinate
+	 * 
+	 * @param 		y		is the y data value
+	 * @return				pixel coordinate, or 0 if the chart have not been drawn yet.
+	 */
+	protected int getYCoordinate(int y){
+		return 0;
+	}
+}