AfflictionNetworks/samskivert
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Added support for having the label attempt to lay itself out in an

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aesthetically pleasing manner. Took another crack at unfucking the whole
rendering outside the bounds fiasco. It appears that second guessing the x
value returned in TextLayout's bounds is not a viable strategy. We just
have to suck it up and let it have some blank space if it wants it.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@919 6335cc39-0255-0410-8fd6-9bcaacd3b74c
This commit is contained in:
mdb
2002-11-12 00:37:22 +00:00
parent bb710d44af
commit 7980830c3d
1 changed files with 65 additions and 17 deletions
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projects/samskivert/src/java/com/samskivert/swing/Label.java
+65 -17
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@@ -1,5 +1,5 @@
//
// $Id: Label.java,v 1.24 2002/11/10 04:48:52 ray Exp $
// $Id: Label.java,v 1.25 2002/11/12 00:37:22 mdb Exp $
//
// samskivert library - useful routines for java programs
// Copyright (C) 2002 Michael Bayne
@@ -181,6 +181,18 @@ public class Label implements SwingConstants, LabelStyleConstants
_style = style;
}
/**
* Instructs the label to attempt to achieve a balance between width
* and height that approximates the golden ratio (width ~1.618 times
* height).
*/
public void setGoldenLayout ()
{
// use -1 as an indicator that we should be golden
_constraints.width = -1;
_constraints.height = -1;
}
/**
* Sets the target width for this label. Text will be wrapped to fit
* into this width, forcibly breaking words on character boundaries if
@@ -190,6 +202,10 @@ public class Label implements SwingConstants, LabelStyleConstants
*/
public void setTargetWidth (int targetWidth)
{
if (targetWidth <= 0) {
throw new IllegalArgumentException(
"Invalid target width '" + targetWidth + "'");
}
_constraints.width = targetWidth;
_constraints.height = 0;
}
@@ -205,6 +221,10 @@ public class Label implements SwingConstants, LabelStyleConstants
*/
public void setTargetHeight (int targetHeight)
{
if (targetHeight <= 0) {
throw new IllegalArgumentException(
"Invalid target height '" + targetHeight + "'");
}
_constraints.width = 0;
_constraints.height = targetHeight;
}
@@ -253,10 +273,40 @@ public class Label implements SwingConstants, LabelStyleConstants
// if we have a target height, do some processing and convert that
// into a target width
if (_constraints.height > 0) {
if (_constraints.height > 0 || _constraints.width == -1) {
int targetHeight = _constraints.height;
// if we're approximating the golden ratio, target a height
// that gets us near that ratio, then we can err on the side
// of being a bit wider which is generally nicer than being
// taller (for those of us that don't speak verticall written
// languages, anyway)
if (_constraints.width == -1) {
TextLayout layout = new TextLayout(textIterator(gfx), frc);
Rectangle2D bounds = layout.getBounds();
int lines = 1;
double width = bounds.getWidth()/lines;
double height = bounds.getHeight()*lines;
double delta = Math.abs(width/height - GOLDEN_RATIO);
do {
width = bounds.getWidth() / (lines+1);
double nheight = bounds.getHeight() * (lines+1);
double ndelta = Math.abs(width/nheight - GOLDEN_RATIO);
if (delta <= ndelta) {
break;
}
delta = ndelta;
height = nheight;
} while (++lines < 200); // cap ourselves at 200 lines
targetHeight = (int)Math.ceil(height);
}
TextLayout layout = new TextLayout(textIterator(gfx), frc);
Rectangle2D bounds = layout.getBounds();
int lines = Math.round(_constraints.height / getHeight(layout));
int lines = Math.round(targetHeight / getHeight(layout));
if (lines > 1) {
int targetWidth = (int)Math.round(bounds.getWidth() / lines);
@@ -278,7 +328,6 @@ public class Label implements SwingConstants, LabelStyleConstants
LineBreakMeasurer measurer =
new LineBreakMeasurer(textIterator(gfx), frc);
layouts = computeLines(measurer, _constraints.width, _size, false);
}
// if no constraint, or our constraining height puts us on one line
@@ -358,7 +407,8 @@ public class Label implements SwingConstants, LabelStyleConstants
break;
}
Rectangle2D bounds = layout.getBounds();
width = Math.max(width, bounds.getWidth());
System.out.println(bounds);
width = Math.max(width, bounds.getX() + bounds.getWidth());
height += getHeight(layout);
layouts.add(new Tuple(layout, bounds));
}
@@ -428,7 +478,8 @@ public class Label implements SwingConstants, LabelStyleConstants
Rectangle2D lbounds = _lbounds[i];
y += layout.getAscent();
float dx = 0, extra = (float)(_size.width - lbounds.getWidth());
float extra = (float)(_size.width - lbounds.getWidth() -
lbounds.getX());
switch (_style) {
case OUTLINE:
// if we're outlining, we really have two pixels less space
@@ -447,20 +498,14 @@ public class Label implements SwingConstants, LabelStyleConstants
break;
}
float rx = x;
switch (_align) {
case -1: dx = layout.isLeftToRight() ? 0 : extra; break;
case LEFT: dx = 0; break;
case RIGHT: dx = extra; break;
case CENTER: dx = extra/2; break;
case -1: rx = x + (layout.isLeftToRight() ? 0 : extra); break;
case LEFT: break;
case RIGHT: rx = x + extra; break;
case CENTER: rx = x + extra/2; break;
}
// we need to account both for our justification and for the
// fiddly business that TextLayouts do wherein they don't
// render where you ask them to render, but instead they
// render some number of pixels away, which is reported in the
// "position" part of their bounds
float rx = (float)(x + dx - lbounds.getX());
switch (_style) {
case OUTLINE:
// render the outline using the hacky, but much nicer than
@@ -557,4 +602,7 @@ public class Label implements SwingConstants, LabelStyleConstants
/** The color in which to render the text or null if the text should
* be rendered with the graphics context color. */
protected Color _textColor = null;
/** An approximation of the golden ratio. */
protected static final double GOLDEN_RATIO = 1.618034;
}