如何创建段落而不指定每个在SharpPDF中的精确坐标？

Question

我可以用SharpPDF添加段落，而不必指定确切的坐标吗？我不能只将段落放在另一个之下吗？

请告诉我，如果您使用过图书馆。

Answer 1

不可能在不指定坐标的情况下一个接一个地添加段落，但是我确实写了这个示例，它会将段落向下移动到页面上，并在必要时创建一个新页面。在这个想要你可以写出文本，段落，绘图，并且总是知道“光标”的位置。

const int WIDTH = 500; 
const int HEIGHT = 792; 

pdfDocument myDoc; 
pdfPage currentPage; 

private void button1_Click(object sender, EventArgs e) 
{ 
    int height = 0; 

    myDoc = new pdfDocument("TUTORIAL", "ME"); 
    currentPage = myDoc.addPage(HEIGHT, WIDTH); 

    string paragraph1 = "All the goats live in the land of the trees and the bushes, " 
     + " when a person lives in the land of the trees and the bushes they wonder about the sanity" 
     + " of it all. Whatever."; 

    string paragraph2 = "Redwood National and State Parks is located in northernmost coastal " 
     + "California — about 325 miles north of San Francisco, Calif. Roughly 50 miles long, the parklands" 
     + "stretch from near the Oregon border in the north to the Redwood Creek watershed southeast of" 
     + "Orick, Calif. Five information centers are located along this north-south corrdior. Park " 
     + "Headquarters is located in Crescent City, Calif. (95531) at 1111 Second Street."; 

    int iYpos = HEIGHT; 

    for (int ix = 0; ix < 10; ix++) 
    { 
     height = GetStringHeight(paragraph1, new Font("Helvetica", 12), WIDTH); 
     iYpos = CheckHeight(height, iYpos); 
     currentPage.addParagraph(paragraph1, 0, iYpos, sharpPDF.Enumerators.predefinedFont.csHelvetica, 12, WIDTH); 
     iYpos -= height; 

     height = GetStringHeight(paragraph2, new Font("Helvetica", 12), WIDTH); 
     iYpos = CheckHeight(height, iYpos); 
     currentPage.addParagraph(paragraph2, 0, iYpos, sharpPDF.Enumerators.predefinedFont.csHelvetica, 12, WIDTH); 
     iYpos -= height; 
    } 

    string tmp = Path.GetFileNameWithoutExtension(Path.GetTempFileName()) + ".pdf"; 
    myDoc.createPDF(tmp); 
} 

private int GetStringHeight(string text, Font font, int width) 
{ 
    Bitmap b = new Bitmap(WIDTH, HEIGHT); 
    Graphics g = Graphics.FromImage((Image)b); 
    SizeF size = g.MeasureString(text, font, (int)Math.Ceiling((float)width/72F * g.DpiX)); 
    return (int)Math.Ceiling(size.Height) 
} 

private int CheckHeight(int height, int iYpos) 
{ 
    if (height > iYpos) 
    { 
     currentPage = myDoc.addPage(HEIGHT, WIDTH); 
     iYpos = HEIGHT; 
    } 
    return iYpos; 
} 

Y在这个API中倒退，所以792是TOP，0是BOTTOM。我使用一个Graphics对象来测量字符串的高度，因为Graphics是以像素为单位的，而Pdf是以点为单位的，我估计它们是相似的。然后我从剩余的Y值中减去高度。

在这个例子中，我不断地加入paragraph1和paragraph2，随着我一起更新我的Y位置。当我到达页面底部时，我创建一个新页面并重置我的Y位置。

这个项目多年来一直没有看到任何更新，但源代码是可用的，使用类似于我所做的一些事情可以使你自己的功能，允许你连续添加段落跟踪CURSOR在哪些方面认为应该继续下一步的位置。