Graphics Util: draw shapes and text
/* Copyright (c) 2006, 2009, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
import java.awt.BasicStroke;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
public class GraphicsUtil {
public static final int H_LEFT = -1;
public static final int H_CENTER = 0;
public static final int H_RIGHT = 1;
public static final int V_TOP = -1;
public static final int V_CENTER = 0;
public static final int V_BASELINE = 1;
public static final int V_BOTTOM = 2;
static public void switchToWidth(Graphics g, int width) {
if(g instanceof Graphics2D) {
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke((float) width));
}
}
static public void drawCenteredArc(Graphics g, int x, int y,
int r, int start, int dist) {
g.drawArc(x - r, y - r, 2 * r, 2 * r, start, dist);
}
static public Rectangle getTextBounds(Graphics g, Font font,
String text, int x, int y, int halign, int valign) {
if(g == null) return new Rectangle(x, y, 0, 0);
Font oldfont = g.getFont();
if(font != null) g.setFont(font);
Rectangle ret = getTextBounds(g, text, x, y, halign, valign);
if(font != null) g.setFont(oldfont);
return ret;
}
static public Rectangle getTextBounds(Graphics g, String text,
int x, int y, int halign, int valign) {
if(g == null) return new Rectangle(x, y, 0, 0);
FontMetrics mets = g.getFontMetrics();
int width = mets.stringWidth(text);
int ascent = mets.getAscent();
int height = ascent + mets.getDescent();
Rectangle ret = new Rectangle(x, y, width, height);
switch(halign) {
case H_CENTER: ret.translate(-(width / 2), 0); break;
case H_RIGHT: ret.translate(-width, 0); break;
default: ;
}
switch(valign) {
case V_TOP: break;
case V_CENTER: ret.translate(0, -(ascent / 2)); break;
case V_BASELINE: ret.translate(0, -ascent); break;
case V_BOTTOM: ret.translate(0, -height); break;
default: ;
}
return ret;
}
static public void drawText(Graphics g, Font font,
String text, int x, int y, int halign, int valign) {
Font oldfont = g.getFont();
if(font != null) g.setFont(font);
drawText(g, text, x, y, halign, valign);
if(font != null) g.setFont(oldfont);
}
static public void drawText(Graphics g, String text,
int x, int y, int halign, int valign) {
if(text.length() == 0) return;
Rectangle bd = getTextBounds(g, text, x, y, halign, valign);
g.drawString(text, bd.x, bd.y + g.getFontMetrics().getAscent());
}
static public void drawCenteredText(Graphics g, String text,
int x, int y) {
drawText(g, text, x, y, H_CENTER, V_CENTER);
}
static public void drawArrow(Graphics g, int x0, int y0, int x1, int y1,
int headLength, int headAngle) {
double offs = headAngle * Math.PI / 180.0;
double angle = Math.atan2(y0 - y1, x0 - x1);
int[] xs = { x1 + (int) (headLength * Math.cos(angle + offs)), x1,
x1 + (int) (headLength * Math.cos(angle - offs)) };
int[] ys = { y1 + (int) (headLength * Math.sin(angle + offs)), y1,
y1 + (int) (headLength * Math.sin(angle - offs)) };
g.drawLine(x0, y0, x1, y1);
g.drawPolyline(xs, ys, 3);
}
}
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