labelrenderer.java

来自「用applet实现很多应用小程序」· Java 代码 · 共 810 行 · 第 1/2 页

                                        g.getTransform().getScaleY());
        double x = shape.getMinX() + size*m_horizBorder;
        double y = shape.getMinY() + size*m_vertBorder;
        
        // render image
        if ( img != null ) {            
            double w = size * img.getWidth(null);
            double h = size * img.getHeight(null);
            double ix=x, iy=y;
            
            // determine one co-ordinate based on the image position
            switch ( m_imagePos ) {
            case Constants.LEFT:
                x += w + size*m_imageMargin;
                break;
            case Constants.RIGHT:
                ix = shape.getMaxX() - size*m_horizBorder - w;
                break;
            case Constants.TOP:
                y += h + size*m_imageMargin;
                break;
            case Constants.BOTTOM:
                iy = shape.getMaxY() - size*m_vertBorder - h;
                break;
            default:
                throw new IllegalStateException(
                        "Unrecognized image alignment setting.");
            }
            
            // determine the other coordinate based on image alignment
            switch ( m_imagePos ) {
            case Constants.LEFT:
            case Constants.RIGHT:
                // need to set image y-coordinate
                switch ( m_vImageAlign ) {
                case Constants.TOP:
                    break;
                case Constants.BOTTOM:
                    iy = shape.getMaxY() - size*m_vertBorder - h;
                    break;
                case Constants.CENTER:
                    iy = shape.getCenterY() - h/2;
                    break;
                }
                break;
            case Constants.TOP:
            case Constants.BOTTOM:
                // need to set image x-coordinate
                switch ( m_hImageAlign ) {
                case Constants.LEFT:
                    break;
                case Constants.RIGHT:
                    ix = shape.getMaxX() - size*m_horizBorder - w;
                    break;
                case Constants.CENTER:
                    ix = shape.getCenterX() - w/2;
                    break;
                }
                break;
            }
            
            if ( useInt && size == 1.0 ) {
                // if possible, use integer precision
                // results in faster, flicker-free image rendering
                g.drawImage(img, (int)ix, (int)iy, null);
            } else {
                m_transform.setTransform(size,0,0,size,ix,iy);
                g.drawImage(img, m_transform, null);
            }
        }
        
        // render text
        int textColor = item.getTextColor();
        if ( text != null && ColorLib.alpha(textColor) > 0 ) {
            g.setPaint(ColorLib.getColor(textColor));
            g.setFont(m_font);
            FontMetrics fm = DEFAULT_GRAPHICS.getFontMetrics(m_font);

            // compute available width
            double tw;
            switch ( m_imagePos ) {
            case Constants.TOP:
            case Constants.BOTTOM:
                tw = shape.getWidth() - 2*size*m_horizBorder;
                break;
            default:
                tw = m_textDim.width;
            }
            
            // compute available height
            double th;
            switch ( m_imagePos ) {
            case Constants.LEFT:
            case Constants.RIGHT:
                th = shape.getHeight() - 2*size*m_vertBorder;
                break;
            default:
                th = m_textDim.height;
            }
            
            // compute starting y-coordinate
            y += fm.getAscent();
            switch ( m_vTextAlign ) {
            case Constants.TOP:
                break;
            case Constants.BOTTOM:
                y += th - m_textDim.height;
                break;
            case Constants.CENTER:
                y += (th - m_textDim.height)/2;
            }
            
            // render each line of text
            int lh = fm.getHeight(); // the line height
            int start = 0, end = text.indexOf(m_delim);
            for ( ; end >= 0; y += lh ) {
                drawString(g, fm, text.substring(start, end), useInt, x, y, tw);
                start = end+1;
                end = text.indexOf(m_delim, start);   
            }
            drawString(g, fm, text.substring(start), useInt, x, y, tw);
        }
    
        // draw border
        if (type==RENDER_TYPE_DRAW || type==RENDER_TYPE_DRAW_AND_FILL) {
            GraphicsLib.paint(g,item,shape,getStroke(item),RENDER_TYPE_DRAW);
        }
    }
    
    private final void drawString(Graphics2D g, FontMetrics fm, String text,
            boolean useInt, double x, double y, double w)
    {
        // compute the x-coordinate
        double tx;
        switch ( m_hTextAlign ) {
        case Constants.LEFT:
            tx = x;
            break;
        case Constants.RIGHT:
            tx = x + w - fm.stringWidth(text);
            break;
        case Constants.CENTER:
            tx = x + (w - fm.stringWidth(text)) / 2;
            break;
        default:
            throw new IllegalStateException(
                    "Unrecognized text alignment setting.");
        }
        // use integer precision unless zoomed-in
        // results in more stable drawing
        if ( useInt ) {
            g.drawString(text, (int)tx, (int)y);
        } else {
            g.drawString(text, (float)tx, (float)y);
        }
    }
    
    /**
     * Returns the image factory used by this renderer.
     * @return the image factory
     */
    public ImageFactory getImageFactory() {
        if ( m_images == null ) m_images = new ImageFactory();
        return m_images;
    }
    
    /**
     * Sets the image factory used by this renderer.
     * @param ifact the image factory
     */
    public void setImageFactory(ImageFactory ifact) {
        m_images = ifact;
    }
    
    // ------------------------------------------------------------------------
    
    /**
     * Get the horizontal text alignment within the layout. One of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}. The default is centered text.
     * @return the horizontal text alignment
     */
    public int getHorizontalTextAlignment() {
        return m_hTextAlign;
    }
    
    /**
     * Set the horizontal text alignment within the layout. One of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}. The default is centered text.
     * @param halign the desired horizontal text alignment
     */
    public void setHorizontalTextAlignment(int halign) {
        if ( halign != Constants.LEFT &&
             halign != Constants.RIGHT &&
             halign != Constants.CENTER )
           throw new IllegalArgumentException(
                   "Illegal horizontal text alignment value.");
        m_hTextAlign = halign;
    }
    
    /**
     * Get the vertical text alignment within the layout. One of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}. The default is centered text.
     * @return the vertical text alignment
     */
    public int getVerticalTextAlignment() {
        return m_vTextAlign;
    }
    
    /**
     * Set the vertical text alignment within the layout. One of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}. The default is centered text.
     * @param valign the desired vertical text alignment
     */
    public void setVerticalTextAlignment(int valign) {
        if ( valign != Constants.TOP &&
             valign != Constants.BOTTOM &&
             valign != Constants.CENTER )
            throw new IllegalArgumentException(
                    "Illegal vertical text alignment value.");
        m_vTextAlign = valign;
    }
    
    /**
     * Get the horizontal image alignment within the layout. One of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}. The default is a centered image.
     * @return the horizontal image alignment
     */
    public int getHorizontalImageAlignment() {
        return m_hImageAlign;
    }
    
    /**
     * Set the horizontal image alignment within the layout. One of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}. The default is a centered image.
     * @param halign the desired horizontal image alignment
     */
    public void setHorizontalImageAlignment(int halign) {
        if ( halign != Constants.LEFT &&
             halign != Constants.RIGHT &&
             halign != Constants.CENTER )
           throw new IllegalArgumentException(
                   "Illegal horizontal text alignment value.");
        m_hImageAlign = halign;
    }
    
    /**
     * Get the vertical image alignment within the layout. One of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}. The default is a centered image.
     * @return the vertical image alignment
     */
    public int getVerticalImageAlignment() {
        return m_vImageAlign;
    }
    
    /**
     * Set the vertical image alignment within the layout. One of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}. The default is a centered image.
     * @param valign the desired vertical image alignment
     */
    public void setVerticalImageAlignment(int valign) {
        if ( valign != Constants.TOP &&
             valign != Constants.BOTTOM &&
             valign != Constants.CENTER )
            throw new IllegalArgumentException(
                    "Illegal vertical text alignment value.");
        m_vImageAlign = valign;
    }
    
    /**
     * Get the image position, determining where the image is placed with
     * respect to the text. One of {@link Constants#LEFT},
     * {@link Constants#RIGHT}, {@link Constants#TOP}, or
     * {@link Constants#BOTTOM}.  The default is left.
     * @return the image position
     */
    public int getImagePosition() {
        return m_imagePos;
    }
    
    /**
     * Set the image position, determining where the image is placed with
     * respect to the text. One of {@link Constants#LEFT},
     * {@link Constants#RIGHT}, {@link Constants#TOP}, or
     * {@link Constants#BOTTOM}.  The default is left.
     * @param pos the desired image position
     */
    public void setImagePosition(int pos) {
        if ( pos != Constants.TOP &&
             pos != Constants.BOTTOM &&
             pos != Constants.LEFT &&
             pos != Constants.RIGHT &&
             pos != Constants.CENTER )
           throw new IllegalArgumentException(
                   "Illegal image position value.");
        m_imagePos = pos;
    }
    
    // ------------------------------------------------------------------------
    
    /**
     * Get the horizontal alignment of this node with respect to its
     * x, y coordinates.
     * @return the horizontal alignment, one of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}.
     */
    public int getHorizontalAlignment() {
        return m_xAlign;
    }
    
    /**
     * Get the vertical alignment of this node with respect to its
     * x, y coordinates.
     * @return the vertical alignment, one of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}.
     */
    public int getVerticalAlignment() {
        return m_yAlign;
    }
    
    /**
     * Set the horizontal alignment of this node with respect to its
     * x, y coordinates.
     * @param align the horizontal alignment, one of
     * {@link prefuse.Constants#LEFT}, {@link prefuse.Constants#RIGHT}, or
     * {@link prefuse.Constants#CENTER}.
     */ 
    public void setHorizontalAlignment(int align) {
        m_xAlign = align;
    }
    
    /**
     * Set the vertical alignment of this node with respect to its
     * x, y coordinates.
     * @param align the vertical alignment, one of
     * {@link prefuse.Constants#TOP}, {@link prefuse.Constants#BOTTOM}, or
     * {@link prefuse.Constants#CENTER}.
     */ 
    public void setVerticalAlignment(int align) {
        m_yAlign = align;
    }
    
    /**
     * Returns the amount of padding in pixels between the content 
     * and the border of this item along the horizontal dimension.
     * @return the horizontal padding
     */
    public int getHorizontalPadding() {
        return m_horizBorder;
    }
    
    /**
     * Sets the amount of padding in pixels between the content 
     * and the border of this item along the horizontal dimension.
     * @param xpad the horizontal padding to set
     */
    public void setHorizontalPadding(int xpad) {
        m_horizBorder = xpad;
    }
    
    /**
     * Returns the amount of padding in pixels between the content 
     * and the border of this item along the vertical dimension.
     * @return the vertical padding
     */
    public int getVerticalPadding() {
        return m_vertBorder;
    }
    
    /**
     * Sets the amount of padding in pixels between the content 
     * and the border of this item along the vertical dimension.
     * @param ypad the vertical padding
     */
    public void setVerticalPadding(int ypad) {
        m_vertBorder = ypad;
    }
    
    /**
     * Get the padding, in pixels, between an image and text.
     * @return the padding between an image and text
     */
    public int getImageTextPadding() {
        return m_imageMargin;
    }
    
    /**
     * Set the padding, in pixels, between an image and text.
     * @param pad the padding to use between an image and text
     */
    public void setImageTextPadding(int pad) {
        m_imageMargin = pad;
    }
    
} // end of class LabelRenderer