不使用paintComponent（Graphics g）是否可以获得正确的字符串大小？

Question

Actually I have these methods to get the width/height size of a string, both requires the command inside a paint component. But I want to get this values inside a class constructor . This is possible?

public int getStringWidth(Graphics g){
    g2d = (Graphics2D) g;
    metrics = g2d.getFontMetrics(this.font);
    return metrics.stringWidth(this.string);
}

public int getStringHeight(Graphics g){
    g2d = (Graphics2D) g;
    metrics = g2d.getFontMetrics(this.font);
    int height = (int)font.createGlyphVector(metrics.getFontRenderContext(), this.string).getVisualBounds().getHeight();    
    return height;
}

font.createGlyphVector(metrics.getFontRenderContext(), this.string).getVisualBounds().getHeight() it's the best command that I got to precisely calculate the string height size and it needs Graphics g too.

Answer 1

You can try to create a BufferedImage with the right size and use createGraphics() on it to get an actual Graphics object that is drawable.

BufferedImage img = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
Graphics g = img.createGraphics();