Draw string with alignment - Java 2D Graphics

Java examples for 2D Graphics:Text

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Description

Draw string with alignment

Demo Code

/**//www .  jav a  2 s .  c o  m
 * Copyright (C) 2012-14 graphene developers. See COPYRIGHT.TXT
 * All rights reserved. Use is subject to license terms. See LICENSE.TXT
 */
//package org.epics.graphene;

import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;

/**
 *
 * @author carcassi
 */
class Java2DStringUtilities {

    /**
     *How a string will be drawn, in relation to the given center pixel.
     */
    public enum Alignment {
        TOP_RIGHT, TOP, TOP_LEFT, RIGHT, CENTER, LEFT, BOTTOM_RIGHT, BOTTOM, BOTTOM_LEFT;

        private int stringRightSide(Rectangle2D stringBounds, int x) {
            switch (this) {
            case BOTTOM_LEFT:
            case LEFT:
            case TOP_LEFT:
                return x;
            case BOTTOM:
            case CENTER:
            case TOP:
                return x
                        - (int) Math.floor(stringBounds.getCenterX() - 0.5);
            case BOTTOM_RIGHT:
            case RIGHT:
            case TOP_RIGHT:
                return x - (int) Math.floor(stringBounds.getWidth() - 1.5);
            }
            throw new UnsupportedOperationException("Unsupported case");
        }

        private int stringBaseline(Rectangle2D stringBounds, int y) {
            switch (this) {
            case TOP_RIGHT:
            case TOP:
            case TOP_LEFT:
                return y
                        - (int) Math
                                .ceil(stringBounds.getCenterY() * 2 - 0.5);
            case RIGHT:
            case CENTER:
            case LEFT:
                return y - (int) Math.ceil(stringBounds.getCenterY()) + 1;
            case BOTTOM_RIGHT:
            case BOTTOM:
            case BOTTOM_LEFT:
                return y + 1;
            }
            throw new UnsupportedOperationException("Unsupported case");
        }
    }

    /**
     *Draws a string using the given alignment.
     * @param g Graphics2D element, calls drawString.
     * @param alignment Possible values: TOP_RIGHT, TOP, TOP_LEFT, RIGHT, CENTER, LEFT, BOTTOM_RIGHT, BOTTOM, BOTTOM_LEFT;
     * @param x corresponds to different positions based on the alignment,
     * but generally the x-coordinate of the pixel position where the graphics component will begin drawing the string.
     * @param y corresponds to different positions based on the alignment,
     * but generally the y-coordinate of the pixel position where the graphics component will begin drawing the string.
     * @param text string to be drawn.
     */
    public static void drawString(Graphics2D g, Alignment alignment, int x,
            int y, String text) {
        Rectangle2D stringBounds = g.getFontMetrics().getStringBounds(text,
                g);
        g.drawString(text, alignment.stringRightSide(stringBounds, x),
                alignment.stringBaseline(stringBounds, y));
    }
}

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