构建可扩展的Java图表组件 - 编程入门网
getTickCount();
int tickDist = (int) ((double)(scale.getScreenMax()-scale.getScreenMin())/(double)(ticks+1));
int tickX = scale.getScreenMin();
int tickY = peerAxis.getScale().getScreenMin();
int gridLength = peerAxis.getScale().getScreenMax();
int axisLength = scale.getScreenMax()-scale.getScreenMin();
/*设置轴线颜色*/
g.setColor(axisColor);
/*绘制横轴*/
g.drawLine(tickX, tickY, tickX+axisLength,tickY);
for ( int i = 0 ; i < ticks; i++ )
{
tickX = scale.getScreenMin()+tickDist*(i+1);
if ( isDrawGrid() )
{
/*如果drawGrid属性为true,用gridColor绘制网格线*/
g.setColor(gridColor);
g.drawLine(tickX, tickY , tickX, gridLength );
}
/*绘制刻度线*/
g.setColor(axisColor);
g.drawLine(tickX, tickY , tickX, tickY+tickLength);
int tickLabelWidth = g.getFontMetrics().stringWidth(String.valueOf(i+1));
int tickLabelHeight = g.getFontMetrics().getHeight();
g.drawString(String.valueOf(i+1), tickX-(tickLabelWidth/2), tickY+tickLabelHeight);
}
}
}
public class YAxis extends Axis
{
public void draw(Graphics g)
{
if ( ! (scale instanceof YScale) )
return;
int ticks = getTickCount();
int tickDist = (int) Math.abs((double)(scale.getScreenMax() - scale.getScreenMin())/(double)(ticks+1));
int tickY = scale.getScreenMin();
int tickX = peerAxis.getScale().getScreenMin();
int gridLength = peerAxis.getScale().getScreenMax();
int axisLength = scale.getScreenMax();
/*绘制纵坐标轴*/
g.setColor(axisColor);
g.drawLine(tickX, tickY, tickX, axisLength);
for ( int i = 0 ; i < ticks; i++ )
{
tickY = scale.getScreenMin()-tickDist*(i+1);
if ( isDrawGrid() )
{
/*如果drawGrid属性为true,用gridColor绘制网格线*/
g.setColor(gridColor);
g.drawLine(tickX, tickY , gridLength, tickY );
}
/*绘制刻度线*/
g.setColor(axisColor);
g.drawLine(tickX, tickY , tickX-tickLength, tickY);
int tickLabelWidth = g.getFontMetrics().stringWidth(String.valueOf(i+1));
g.drawString(String.valueOf(i+1), tickX-tickLength-tickLabelWidth, tickY);
}
}
}
构建可扩展的Java图表组件(8)时间:2010-09-13实现画折线的LinePlot 由于Plot是由DataSeries为它提供绘图数据的，在实现LinePlot之前，先来实现一个DefaultDataSeries类：
这个DefaultDataSeries提供了一个构造方法，使用者只需提供一组y坐标值，即可构造一个DataSeries了。 下面是很重要的部分了。我们来看看实现一个画折线的LinePlot是多么的简单：
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