📄 dateaxis.java
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LineMetrics lm = tickLabelFont.getLineMetrics("ABCxyz", frc);
if (isVerticalTickLabels()) {
// all tick labels have the same width (equal to the height of
// the font)...
result += lm.getHeight();
}
else {
// look at lower and upper bounds...
DateRange range = (DateRange) getRange();
Date lower = range.getLowerDate();
Date upper = range.getUpperDate();
String lowerStr = null;
String upperStr = null;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
lowerStr = formatter.format(lower);
upperStr = formatter.format(upper);
}
else {
lowerStr = unit.dateToString(lower);
upperStr = unit.dateToString(upper);
}
FontMetrics fm = g2.getFontMetrics(tickLabelFont);
double w1 = fm.stringWidth(lowerStr);
double w2 = fm.stringWidth(upperStr);
result += Math.max(w1, w2);
}
return result;
}
/**
* Estimates the maximum width of the tick labels, assuming the specified
* tick unit is used.
* <P>
* Rather than computing the string bounds of every tick on the axis, we
* just look at two values: the lower bound and the upper bound for the
* axis. These two values will usually be representative.
*
* @param g2 the graphics device.
* @param unit the tick unit to use for calculation.
*
* @return The estimated maximum width of the tick labels.
*/
private double estimateMaximumTickLabelHeight(Graphics2D g2,
DateTickUnit unit) {
RectangleInsets tickLabelInsets = getTickLabelInsets();
double result = tickLabelInsets.getTop() + tickLabelInsets.getBottom();
Font tickLabelFont = getTickLabelFont();
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = tickLabelFont.getLineMetrics("ABCxyz", frc);
if (!isVerticalTickLabels()) {
// all tick labels have the same width (equal to the height of
// the font)...
result += lm.getHeight();
}
else {
// look at lower and upper bounds...
DateRange range = (DateRange) getRange();
Date lower = range.getLowerDate();
Date upper = range.getUpperDate();
String lowerStr = null;
String upperStr = null;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
lowerStr = formatter.format(lower);
upperStr = formatter.format(upper);
}
else {
lowerStr = unit.dateToString(lower);
upperStr = unit.dateToString(upper);
}
FontMetrics fm = g2.getFontMetrics(tickLabelFont);
double w1 = fm.stringWidth(lowerStr);
double w2 = fm.stringWidth(upperStr);
result += Math.max(w1, w2);
}
return result;
}
/**
* Calculates the positions of the tick labels for the axis, storing the
* results in the tick label list (ready for drawing).
*
* @param g2 the graphics device.
* @param state the axis state.
* @param dataArea the area in which the plot should be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
public List refreshTicks(Graphics2D g2,
AxisState state,
Rectangle2D dataArea,
RectangleEdge edge) {
List result = null;
if (RectangleEdge.isTopOrBottom(edge)) {
result = refreshTicksHorizontal(g2, dataArea, edge);
}
else if (RectangleEdge.isLeftOrRight(edge)) {
result = refreshTicksVertical(g2, dataArea, edge);
}
return result;
}
/**
* Recalculates the ticks for the date axis.
*
* @param g2 the graphics device.
* @param dataArea the area in which the data is to be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
protected List refreshTicksHorizontal(Graphics2D g2,
Rectangle2D dataArea,
RectangleEdge edge) {
List result = new java.util.ArrayList();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
DateTickUnit unit = getTickUnit();
Date tickDate = calculateLowestVisibleTickValue(unit);
Date upperDate = getMaximumDate();
while (tickDate.before(upperDate)) {
if (!isHiddenValue(tickDate.getTime())) {
// work out the value, label and position
String tickLabel;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(tickDate);
}
else {
tickLabel = this.tickUnit.dateToString(tickDate);
}
TextAnchor anchor = null;
TextAnchor rotationAnchor = null;
double angle = 0.0;
if (isVerticalTickLabels()) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
if (edge == RectangleEdge.TOP) {
angle = Math.PI / 2.0;
}
else {
angle = -Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.TOP) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
}
else {
anchor = TextAnchor.TOP_CENTER;
rotationAnchor = TextAnchor.TOP_CENTER;
}
}
Tick tick = new DateTick(tickDate, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
tickDate = unit.addToDate(tickDate, this.timeZone);
}
else {
tickDate = unit.rollDate(tickDate, this.timeZone);
continue;
}
// could add a flag to make the following correction optional...
switch (unit.getUnit()) {
case (DateTickUnit.MILLISECOND) :
case (DateTickUnit.SECOND) :
case (DateTickUnit.MINUTE) :
case (DateTickUnit.HOUR) :
case (DateTickUnit.DAY) :
break;
case (DateTickUnit.MONTH) :
tickDate = calculateDateForPosition(new Month(tickDate,
this.timeZone), this.tickMarkPosition);
break;
case(DateTickUnit.YEAR) :
tickDate = calculateDateForPosition(new Year(tickDate,
this.timeZone), this.tickMarkPosition);
break;
default: break;
}
}
return result;
}
/**
* Recalculates the ticks for the date axis.
*
* @param g2 the graphics device.
* @param dataArea the area in which the plot should be drawn.
* @param edge the location of the axis.
*
* @return A list of ticks.
*/
protected List refreshTicksVertical(Graphics2D g2,
Rectangle2D dataArea,
RectangleEdge edge) {
List result = new java.util.ArrayList();
Font tickLabelFont = getTickLabelFont();
g2.setFont(tickLabelFont);
if (isAutoTickUnitSelection()) {
selectAutoTickUnit(g2, dataArea, edge);
}
DateTickUnit unit = getTickUnit();
Date tickDate = calculateLowestVisibleTickValue(unit);
//Date upperDate = calculateHighestVisibleTickValue(unit);
Date upperDate = getMaximumDate();
while (tickDate.before(upperDate)) {
if (!isHiddenValue(tickDate.getTime())) {
// work out the value, label and position
String tickLabel;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
tickLabel = formatter.format(tickDate);
}
else {
tickLabel = this.tickUnit.dateToString(tickDate);
}
TextAnchor anchor = null;
TextAnchor rotationAnchor = null;
double angle = 0.0;
if (isVerticalTickLabels()) {
anchor = TextAnchor.BOTTOM_CENTER;
rotationAnchor = TextAnchor.BOTTOM_CENTER;
if (edge == RectangleEdge.LEFT) {
angle = -Math.PI / 2.0;
}
else {
angle = Math.PI / 2.0;
}
}
else {
if (edge == RectangleEdge.LEFT) {
anchor = TextAnchor.CENTER_RIGHT;
rotationAnchor = TextAnchor.CENTER_RIGHT;
}
else {
anchor = TextAnchor.CENTER_LEFT;
rotationAnchor = TextAnchor.CENTER_LEFT;
}
}
Tick tick = new DateTick(tickDate, tickLabel, anchor,
rotationAnchor, angle);
result.add(tick);
tickDate = unit.addToDate(tickDate, this.timeZone);
}
else {
tickDate = unit.rollDate(tickDate, this.timeZone);
}
}
return result;
}
/**
* Draws the axis on a Java 2D graphics device (such as the screen or a
* printer).
*
* @param g2 the graphics device (<code>null</code> not permitted).
* @param cursor the cursor location.
* @param plotArea the area within which the axes and data should be
* drawn (<code>null</code> not permitted).
* @param dataArea the area within which the data should be drawn
* (<code>null</code> not permitted).
* @param edge the location of the axis (<code>null</code> not permitted).
* @param plotState collects information about the plot
* (<code>null</code> permitted).
*
* @return The axis state (never <code>null</code>).
*/
public AxisState draw(Graphics2D g2,
double cursor,
Rectangle2D plotArea,
Rectangle2D dataArea,
RectangleEdge edge,
PlotRenderingInfo plotState) {
// if the axis is not visible, don't draw it...
if (!isVisible()) {
AxisState state = new AxisState(cursor);
// even though the axis is not visible, we need to refresh ticks in
// case the grid is being drawn...
List ticks = refreshTicks(g2, state, dataArea, edge);
state.setTicks(ticks);
return state;
}
// draw the tick marks and labels...
AxisState state = drawTickMarksAndLabels(g2, cursor, plotArea,
dataArea, edge);
// draw the axis label (note that 'state' is passed in *and*
// returned)...
state = drawLabel(getLabel(), g2, plotArea, dataArea, edge, state);
return state;
}
/**
* Zooms in on the current range.
*
* @param lowerPercent the new lower bound.
* @param upperPercent the new upper bound.
*/
public void zoomRange(double lowerPercent, double upperPercent) {
double start = this.timeline.toTimelineValue(
(long) getRange().getLowerBound()
);
double length = (this.timeline.toTimelineValue(
(long) getRange().getUpperBound())
- this.timeline.⌨️ 快捷键说明
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