Example usage for com.itextpdf.text.pdf.parser Vector subtract

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf.parser Vector subtract.

Prototype

public Vector subtract(final Vector v) 

Source Link

Document

Computes the difference between this vector and the specified vector

Usage

From source file:com.uts.tradeconfo.MyTextExtractionStrategy.java

License:Open Source License

/**
 * Captures text using a simplified algorithm for inserting hard returns and spaces
 * @param   renderInfo   render info//from w  ww  .j  av  a 2s  .  co m
 */
@Override
public void renderText(TextRenderInfo renderInfo) {
    boolean firstRender = result.length() == 0;
    boolean hardReturn = false;

    LineSegment segment = renderInfo.getBaseline();
    Vector start = segment.getStartPoint();
    Vector end = segment.getEndPoint();

    if (!firstRender) {
        Vector x0 = start;
        Vector x1 = lastStart;
        Vector x2 = lastEnd;

        // see http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
        float dist = (x2.subtract(x1)).cross((x1.subtract(x0))).lengthSquared()
                / x2.subtract(x1).lengthSquared();

        float sameLineThreshold = 1f; // we should probably base this on the current font metrics, but 1 pt seems to be sufficient for the time being
        if (dist > sameLineThreshold)
            hardReturn = true;

        // Note:  Technically, we should check both the start and end positions, in case the angle of the text changed without any displacement
        // but this sort of thing probably doesn't happen much in reality, so we'll leave it alone for now
    }

    if (hardReturn) {
        //System.out.println("<< Hard Return >>");
        appendTextChunk("\n");
    } else if (!firstRender) {
        if (result.charAt(result.length() - 1) != ' ' && renderInfo.getText().length() > 0
                && renderInfo.getText().charAt(0) != ' ') { // we only insert a blank space if the trailing character of the previous string wasn't a space, and the leading character of the current string isn't a space
            float spacing = lastEnd.subtract(start).length();
            if (spacing > renderInfo.getSingleSpaceWidth() / 4f) {
                appendTextChunk(" ");
                //System.out.println("Inserting implied space before '" + renderInfo.getText() + "'");
            }
        }
    } else {
        //System.out.println("Displaying first string of content '" + text + "' :: x1 = " + x1);
    }

    //System.out.println("[" + renderInfo.getStartPoint() + "]->[" + renderInfo.getEndPoint() + "] " + renderInfo.getText());
    appendTextChunk(renderInfo.getText());

    lastStart = start;
    lastEnd = end;

}

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