Example usage for org.apache.poi.ss.usermodel Font getFontHeightInPoints

Introduction

In this page you can find the example usage for org.apache.poi.ss.usermodel Font getFontHeightInPoints.

Prototype

short getFontHeightInPoints();

Source Link

Document

Get the font height in points.

Usage

From source file:uk.co.spudsoft.birt.emitters.excel.StyleManagerUtils.java

License:Open Source License

/**
 * Calculate the height of a string formatted according to a set of RichTextRuns and fitted within a give width.
 * @param sourceText/*from ww  w . j av a  2 s . co  m*/
 * The string to be measured.
 * @param defaultFont
 * The font to be used prior to the first RichTextRun.
 * @param widthMM
 * The width of the output.
 * @param richTextRuns
 * The list of RichTextRuns to be applied to the string
 * @return
 * The heigh, in points, of a box big enough to contain the formatted sourceText.
 */
public float calculateTextHeightPoints(String sourceText, Font defaultFont, double widthMM,
        List<RichTextRun> richTextRuns) {
    log.debug("Calculating height for ", sourceText);

    final float widthPt = (float) (72 * Math.max(0, widthMM - 6) / 25.4);

    float totalHeight = 0;
    String[] textLines = sourceText.split("\n");
    int lineStartIndex = 0;
    String lastLine = null;
    Font font = defaultFont;
    for (String textLine : textLines) {
        if (lastLine != null) {
            lineStartIndex += lastLine.length() + 1;
        }
        lastLine = textLine;

        AttributedString attrString = new AttributedString(textLine.isEmpty() ? " " : textLine);
        int runEnd = textLine.length();

        int richTextRunIndex = getRichTextRunIndexForStart(richTextRuns, lineStartIndex);
        if (richTextRunIndex >= 0) {
            font = richTextRuns.get(richTextRunIndex).font;
            if ((richTextRunIndex < richTextRuns.size() - 1)
                    && (richTextRuns.get(richTextRunIndex + 1).startIndex < runEnd)) {
                runEnd = richTextRuns.get(richTextRunIndex + 1).startIndex;
            }
        }

        log.debug("Adding attribute - [", 0, " - ", runEnd, "] = ", defaultFont.getFontName(), " ",
                defaultFont.getFontHeightInPoints(), "pt");
        addFontAttributes(attrString, font, 0, textLine.isEmpty() ? 1 : runEnd);

        for (++richTextRunIndex; (richTextRunIndex < richTextRuns.size())
                && (richTextRuns.get(richTextRunIndex).startIndex < lineStartIndex
                        + textLine.length()); ++richTextRunIndex) {
            RichTextRun run = richTextRuns.get(richTextRunIndex);
            RichTextRun nextRun = richTextRunIndex < richTextRuns.size() - 1
                    ? richTextRuns.get(richTextRunIndex + 1)
                    : null;
            if ((run.startIndex >= lineStartIndex)
                    && (run.startIndex < lineStartIndex + textLine.length() + 1)) {
                int startIdx = run.startIndex - lineStartIndex;
                int endIdx = (nextRun == null ? sourceText.length() : nextRun.startIndex) - lineStartIndex;
                if (endIdx > textLine.length()) {
                    endIdx = textLine.length();
                }
                if (startIdx < endIdx) {
                    log.debug("Adding attribute: [", startIdx, " - ", endIdx, "] = ", run.font.getFontName(),
                            " ", run.font.getFontHeightInPoints(), "pt");
                    addFontAttributes(attrString, run.font, startIdx, endIdx);
                }
            }
        }

        LineBreakMeasurer measurer = new LineBreakMeasurer(attrString.getIterator(), frc);

        float heightAdjustment = 0.0F;
        int lineLength = textLine.isEmpty() ? 1 : textLine.length();
        while (measurer.getPosition() < lineLength) {
            TextLayout layout = measurer.nextLayout(widthPt);
            float lineHeight = layout.getAscent() + layout.getDescent() + layout.getLeading();
            if (layout.getDescent() + layout.getLeading() > heightAdjustment) {
                heightAdjustment = layout.getDescent() + layout.getLeading();
            }
            log.debug("Line: ", textLine, " gives height ", lineHeight, "(", layout.getAscent(), "/",
                    layout.getDescent(), "/", layout.getLeading(), ")");
            totalHeight += lineHeight;
        }
        totalHeight += heightAdjustment;

    }
    log.debug("Height calculated as ", totalHeight);
    return totalHeight;
}