无法在 java.awt.BufferdImage/Graphics2D 中获得正确的文本高度
我正在创建一个 servlet，它使用给定的文本呈现 jpg/png。我希望文本位于渲染图像的中心。我可以获得宽度，但我得到的高度似乎是错误的
Font myfont = new Font(Font.SANS_SERIF, Font.BOLD, 400);
BufferedImage image = new BufferedImage(500, 500, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
g.setFont(myfont);
g.setColor(Color.BLACK);
FontMetrics fm = g.getFontMetrics();
Integer textwidth = fm.stringWidth(imagetext);
Integer textheight = fm.getHeight();
FontRenderContext fr = g.getFontRenderContext();
LineMetrics lm = myfont.getLineMetrics("5", fr );
float ascent = lm.getAscent();
float descent = lm.getDescent();
float height = lm.getHeight();
g.drawString("5", ((imagewidth - textwidth) / 2) , y?);
g.dispose();
ImageIO.write(image, "png", outputstream);
这些是我得到的值： 文本宽度 = 222 文本高度 = 504 上升= 402 血统 = 87 height = 503
有人知道如何获得“5”的准确高度吗？预计身高应该在250左右
Im creating a servlet that renders a jpg/png with a given text. I want the text to be centered on the rendered image. I can get the width, but the height i'm getting seems to be wrong
Font myfont = new Font(Font.SANS_SERIF, Font.BOLD, 400);
BufferedImage image = new BufferedImage(500, 500, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = image.createGraphics();
g.setFont(myfont);
g.setColor(Color.BLACK);
FontMetrics fm = g.getFontMetrics();
Integer textwidth = fm.stringWidth(imagetext);
Integer textheight = fm.getHeight();
FontRenderContext fr = g.getFontRenderContext();
LineMetrics lm = myfont.getLineMetrics("5", fr );
float ascent = lm.getAscent();
float descent = lm.getDescent();
float height = lm.getHeight();
g.drawString("5", ((imagewidth - textwidth) / 2) , y?);
g.dispose();
ImageIO.write(image, "png", outputstream);
These are the values I get:
textwidth = 222
textheight = 504
ascent = 402
descent = 87
height = 503
Anyone know how to get the exact height om the "5" ? The estimated height should be around 250
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它仍然有点偏离，但更接近 (288)：询问 Glyph（实际的图形表示）
其他 Glyph 方法（getGlyphVisualBounds、getGlyphPixelBounds，...）返回相同的值。这是绘制字形时受影响像素的区域，因此在我看来，您不会获得更好的值
It's still a bit off, but much closer (288): ask the Glyph (the actual graphical representation)
Other Glyph methods (getGlyphVisualBounds, getGlyphPixelBounds, ...) return the same value. This is the region of the affected pixels when the glyph is drawn, so you won't get a better value IMO