为什么这个笔划如此零散，为什么它只划在里面？

Question

我正在结合使用 LineBreakMeasurer 和 TextLayout 在图像上绘制一些文本，但由于某种原因，笔划仅在内部划过，而且不是很干净。这是我正在谈论的一个例子： http://i.imgur.com/eHtTw4p.png

当我不在顶部绘制字母并增加笔划宽度时，它实际上会在内部变粗而不是在外部。

这是我的代码：

        float y = 0.0f;
        float wrappingWidth = img.getWidth() * 0.8f;
        LineBreakMeasurer measurer = new LineBreakMeasurer(str.getIterator(), imageGraphics.getFontRenderContext());
        while (measurer.getPosition() < sentence.length()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            y += layout.getAscent();
            float x =  ((wrappingWidth * 0.8f) - layout.getVisibleAdvance()) / 2f + (wrappingWidth * 0.2f);

            AffineTransform transform = new AffineTransform();
            transform.translate((double)x, (double)y);
            Shape outline = layout.getOutline(transform);

            imageGraphics.setColor(Color.black);
            imageGraphics.setClip(outline);
            imageGraphics.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER));
            imageGraphics.draw(outline);
            imageGraphics.setColor(Color.white);
            imageGraphics.setStroke(new BasicStroke());

            layout.draw(imageGraphics, x, y);
            y += layout.getDescent() + layout.getLeading();
        }

我不确定我做错了什么。有人知道吗？

Answer 1

在绘制轮廓之前创建 Graphics 上下文的另一个副本...

Graphics2D sg = (Graphics2D)imageGraphics.create();
sg.setColor(Color.black);
sg.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER));
sg.draw(outline);
sg.dispose();

我也会摆脱剪辑...

而不是 "stroking" 结果形状，我很想 "fill" 背景颜色和 "draw" 轮廓颜色，例如...

Graphics2D sg = (Graphics2D) g2d.create();
AffineTransform transform = new AffineTransform();
transform.translate((double) drawPosX, (double) drawPosY);
Shape outline = layout.getOutline(transform);

sg.setColor(Color.WHITE);
sg.fill(outline);
sg.setColor(Color.BLACK);
sg.draw(outline);
sg.dispose();

但是如果你想要 "nice" 粗笔划，请使用 BasicStroke.JOIN_ROUND 而不是 BasicStroke.JOIN_MITER

Graphics2D sg = (Graphics2D) g2d.create();
AffineTransform transform = new AffineTransform();
transform.translate((double) drawPosX, (double) drawPosY);
Shape outline = layout.getOutline(transform);

sg.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
sg.setColor(Color.BLACK);
sg.draw(outline);
sg.dispose();

为什么这个笔划如此零散，为什么它只划在里面？

Why is this stroke so fragmented and why does it only stroke the inside?

java

awt

java-2d