我試圖圍繞文本元素使用getBBox(),繪製一個矩形代碼非常簡單,創建文檔,添加文本元素,引導文檔和添加矩形。 問題是,getBBox正在返回一些奇怪的值,我錯過了什麼?使用蠟染的文本元素的邊界框錯誤的值
DOMImplementation impl;
String svgNS;
SVGDocument doc;
Element svgRoot;
UserAgent userAgent;
DocumentLoader loader;
BridgeContext ctx;
GVTBuilder builder;
GraphicsNode rootGN;
...
// get a DOM and create a document
impl = SVGDOMImplementation.getDOMImplementation();
svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
doc = (SVGDocument)impl.createDocument(svgNS, "svg", null);
// Get (the 'svg' element).
svgRoot = doc.getDocumentElement();
// Set the width and height attributes on the root 'svg' element.
svgRoot.setAttributeNS(svgNS, "width", "400");
svgRoot.setAttributeNS(svgNS, "height", "450");
// Add a text element
Element txtElem = doc.createElementNS(svgNS, "text");
txtElem.setAttributeNS(svgNS, "x", "30");
txtElem.setAttributeNS(svgNS, "y", "50");
txtElem.setAttributeNS(svgNS, "style", "font-family:Arial;font-size:20;stroke:#000000;#fill:#00ff00;");
txtElem.setTextContent("sometext");
svgRoot.appendChild(txtElem);
// boot the document
userAgent = new UserAgentAdapter();
loader = new DocumentLoader(userAgent);
ctx = new BridgeContext(userAgent, loader);
ctx.setDynamicState(BridgeContext.DYNAMIC);
builder = new GVTBuilder();
rootGN = builder.build(ctx, doc);
// add a bounding box to text elements
NodeList nodelist = doc.getElementsByTagName("text");
for (int i=0; i < nodelist.getLength(); i++) {
SVGOMTextElement textElem = (SVGOMTextElement)nodelist.item(i);
SVGRect bbox = textElem.getBBox();
Element rectangle = doc.createElementNS(svgNS, "rect");
rectangle.setAttributeNS(svgNS, "x", new Float(bbox.getX()).toString());
rectangle.setAttributeNS(svgNS, "y", new Float(bbox.getY()).toString());
rectangle.setAttributeNS(svgNS, "width", new Float(bbox.getWidth()).toString());
rectangle.setAttributeNS(svgNS, "height", new Float(bbox.getHeight()).toString());
rectangle.setAttributeNS(svgNS, "fill", "rgba(0,0,0,0)");
rectangle.setAttributeNS(svgNS, "stroke", "#ff0000");
rectangle.setAttributeNS(svgNS, "stroke-width", "1");
svgRoot.appendChild(rectangle);
}
這是我得到的SVG文件,你可以看到長方形有不同的X和Y值(寬度和高度也錯了)。
<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" contentScriptType="text/ecmascript" zoomAndPan="magnify" width="400" contentStyleType="text/css" preserveAspectRatio="xMidYMid meet" height="450" version="1.0">
<text x="30" style="font-family:Georgia;font-size:20;stroke:#000000;#fill:#00ff00;" y="50">sometext</text>
<rect x="0.65234375" fill="rgba(0,0,0,0)" width="55.621094" stroke-width="1" stroke="#ff0000" height="8.597656" y="8.425781"/>
</svg>
你還可以發佈添加矩形的代碼嗎? –
矩形添加代碼在for循環中,在文檔啓動之後。不知道這是否是正確的做法。 –
沒關係,我沒有向下滾動,看不到for循環... –