/** Calculate the rectangle occupied by the data */
protected Rectangle getDataRectangle(Graphics g, Rectangle r) {
Axis a;
int waxis;
int x = r.x;
int y = r.y;
int width = r.width;
int height = r.height;
for (int i = 0; i < axis.size(); i++) {
a = ((Axis) axis.elementAt(i));
waxis = a.getAxisWidth(g);
switch (a.getAxisPos()) {
case Axis.LEFT:
x += waxis;
width -= waxis;
break;
case Axis.RIGHT:
width -= waxis;
break;
case Axis.TOP:
y += waxis;
height -= waxis;
break;
case Axis.BOTTOM:
height -= waxis;
break;
}
}
return new Rectangle(x, y, width, height);
}
/**
* Detach a previously attached Axis.
*
* @param the Axis to dettach.
*/
public void detachAxis(Axis a) {
if (a != null) {
a.detachAll();
a.g2d = null;
axis.removeElement(a);
}
}
/**
* Create and attach an Axis to the graph. The position of the axis is one of Axis.TOP,
* Axis.BOTTOM, Axis.LEFT or Axis.RIGHT.
*
* @param position Position of the axis in the drawing window.
*/
public Axis createAxis(int position) {
Axis a;
try {
a = new Axis(position);
a.g2d = this;
axis.addElement(a);
} catch (Exception e) {
System.out.println("Failed to create Axis");
e.printStackTrace();
return null;
}
return a;
}
/**
* Attach a previously created Axis. Only Axes that have been attached will be drawn
*
* @param the Axis to attach.
*/
public void attachAxis(Axis a) {
if (a == null) return;
try {
axis.addElement(a);
a.g2d = this;
} catch (Exception e) {
System.out.println("Failed to attach Axis");
e.printStackTrace();
}
}
/**
* Draw the Axis. As each axis is drawn and aligned less of the canvas is avaliable to plot the
* data. The returned Rectangle is the canvas area that the data is plotted in.
*/
protected Rectangle drawAxis(Graphics g, Rectangle r) {
Axis a;
int waxis;
Rectangle dr;
int x;
int y;
int width;
int height;
if (square) r = ForceSquare(g, r);
dr = getDataRectangle(g, r);
x = dr.x;
y = dr.y;
width = dr.width;
height = dr.height;
if (clearAll) {
Color c = g.getColor();
g.setColor(DataBackground);
g.fillRect(x, y, width, height);
g.setColor(c);
}
// Draw a frame around the data area (If requested)
if (frame) drawFrame(g, x, y, width, height);
// Now draw the axis in the order specified aligning them with the final
// data area.
for (int i = 0; i < axis.size(); i++) {
a = ((Axis) axis.elementAt(i));
a.data_window = new Dimension(width, height);
switch (a.getAxisPos()) {
case Axis.LEFT:
r.x += a.width;
r.width -= a.width;
a.positionAxis(r.x, r.x, y, y + height);
if (r.x == x) {
a.gridcolor = gridcolor;
a.drawgrid = drawgrid;
a.zerocolor = zerocolor;
a.drawzero = drawzero;
}
a.drawAxis(g);
a.drawgrid = false;
a.drawzero = false;
break;
case Axis.RIGHT:
r.width -= a.width;
a.positionAxis(r.x + r.width, r.x + r.width, y, y + height);
if (r.x + r.width == x + width) {
a.gridcolor = gridcolor;
a.drawgrid = drawgrid;
a.zerocolor = zerocolor;
a.drawzero = drawzero;
}
a.drawAxis(g);
a.drawgrid = false;
a.drawzero = false;
break;
case Axis.TOP:
r.y += a.width;
r.height -= a.width;
a.positionAxis(x, x + width, r.y, r.y);
if (r.y == y) {
a.gridcolor = gridcolor;
a.drawgrid = drawgrid;
a.zerocolor = zerocolor;
a.drawzero = drawzero;
}
a.drawAxis(g);
a.drawgrid = false;
a.drawzero = false;
break;
case Axis.BOTTOM:
r.height -= a.width;
a.positionAxis(x, x + width, r.y + r.height, r.y + r.height);
if (r.y + r.height == y + height) {
a.gridcolor = gridcolor;
a.drawgrid = drawgrid;
a.zerocolor = zerocolor;
a.drawzero = drawzero;
}
a.drawAxis(g);
a.drawgrid = false;
a.drawzero = false;
break;
}
}
return r;
}
/**
* Force the plot to have an aspect ratio of 1 by forcing the axes to have the same range. If the
* range of the axes are very different some extremely odd things can occur. All axes are forced
* to have the same range, so more than 2 axis is pointless.
*/
protected Rectangle ForceSquare(Graphics g, Rectangle r) {
Axis a;
Rectangle dr;
int x = r.x;
int y = r.y;
int width = r.width;
int height = r.height;
double xmin;
double xmax;
double ymin;
double ymax;
double xrange = 0.0;
double yrange = 0.0;
double range;
double aspect;
if (dataset == null | dataset.isEmpty()) return r;
/*
** Force all the axis to have the same range. This of course
** means that anything other than one xaxis and one yaxis
** is a bit pointless.
*/
for (int i = 0; i < axis.size(); i++) {
a = (Axis) axis.elementAt(i);
range = a.maximum - a.minimum;
if (a.isVertical()) {
yrange = Math.max(range, yrange);
} else {
xrange = Math.max(range, xrange);
}
}
if (xrange <= 0 | yrange <= 0) return r;
if (xrange > yrange) range = xrange;
else range = yrange;
for (int i = 0; i < axis.size(); i++) {
a = (Axis) axis.elementAt(i);
a.maximum = a.minimum + range;
}
/*
** Get the new data rectangle
*/
dr = getDataRectangle(g, r);
/*
** Modify the data rectangle so that it is square.
*/
if (dr.width > dr.height) {
x += (dr.width - dr.height) / 2.0;
width -= dr.width - dr.height;
} else {
y += (dr.height - dr.width) / 2.0;
height -= dr.height - dr.width;
}
return new Rectangle(x, y, width, height);
}