Graphics.DrawString到多個矩形

Question

我正在嘗試編寫一個需要在圖像上繪制字符串的函數。 圖像具有1-5個文本框，其中每個都有ax，y，寬度和高度。 這些詳細信息在我正在解析的XML文件中定義，因此我可以訪問每個框。

我的問題是我是否可以使用graphics.DrawString（或類似的方法）輕松地做到這一點。 下面的示例函數將創建一個具有指定的x，y，寬度，高度的矩形，然后在其中繪制一個字符串。 如果字符串不合適，它將被截斷。

    public void DrawStringRectangleFormat(Graphics g)
    {
        // Create string to draw.
        String drawString = "Sample Text is too long to fit into this tiny lil rectangle area right here";

        // Create font and brush.
        Font drawFont = new Font("Arial", 16);
        SolidBrush drawBrush = new SolidBrush(Color.Black);

        // Create rectangle for drawing.
        float x = 150.0F;
        float y = 150.0F;
        float width = 200.0F;
        float height = 50.0F;
        RectangleF drawRect = new RectangleF(x, y, width, height);

        // Set format of string.
        StringFormat drawFormat = new StringFormat();
        drawFormat.Alignment = StringAlignment.Center;

        // Draw string to screen.
        g.DrawString(drawString, drawFont, drawBrush, drawRect, drawFormat);
    }

我要代替它而不是被截斷，它會停在最后一個合適的單詞處，然后轉到下一個矩形（文本框）。 這樣，我可以使用所有可用的文本框。

已經有一種方法可以做到這一點嗎？ 否則，我將需要實現自己的drawString方法。

Answer 1

好的，您要做的是循環遍歷字符串中的每個字符，並連接到最終字符串..因此，基本上是foreach（mystring中的char c）...然后使用measurestring，檢查字符串是否結束盒子的長度，如果是的話，從下一個矩形開始...

https://msdn.microsoft.com/zh-CN/library/6xe5hazb(v=vs.110).aspx

Answer 2

此解決方案使用StringFormat的設置來確保對DrawString的每次調用僅繪制適合的單詞。 然后， Graphics.MeasureCharacterRanges計算不適合該矩形的單詞，其余文本溢出到下一個布局矩形中。

您可能需要自定義如何將輸入字符串拆分為單詞。 現在，我只是將其在空白邊界處分開。

using System.Text.RegularExpressions;
using System.Drawing;

/// <summary>
/// Draw a string using one or more layout rectangles.  Words which don't fit will overflow into the next layout rectangle.
/// </summary>
private static void DrawOverflowString(Graphics graphics, string drawString, RectangleF[] layoutRectangles, StringAlignment alignment)
{
    var drawFont = new Font("Arial", 16.0f);
    var black = new SolidBrush(Color.Black);
    var format = new StringFormat()
    {
        Alignment = alignment,
        Trimming = StringTrimming.Word,
        FormatFlags = StringFormatFlags.LineLimit
    };
    var wordRegex = new Regex("[^\\s]+");
    string remainingText = drawString;
    foreach (var layoutRect in layoutRectangles)
    {
        // Draw everything that will fit into this text box
        graphics.DrawString(remainingText, drawFont, black, layoutRect, format);

        // calculate which words did not fit
        var wordMatches = wordRegex.Matches(remainingText);
        var ranges = wordMatches.OfType<Match>().Select(x => new CharacterRange(x.Index, x.Length)).ToArray();
        format.SetMeasurableCharacterRanges(ranges);
        var wordRegions = graphics.MeasureCharacterRanges(remainingText, drawFont, layoutRect, format);

        var allfit = true;
        for (int i = 0; i < wordRegions.Length; i++)
        {
            if (wordRegions[i].GetBounds(graphics).Width == 0.0f)
            {
                allfit = false;
                remainingText = remainingText.Substring(wordMatches[i].Index);
                break;
            }
        }

        if (allfit)
            break;
    }

    drawFont.Dispose();
    black.Dispose();
}

Answer 3

        protected override void OnPaint(PaintEventArgs e)
    {
        // Call the OnPaint method of the base class.
        base.OnPaint(e);
        List<Rectanglestring> testrecs = new List<Rectanglestring>();
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 12, 40, 12), whattodraw = "" });
        testrecs.Add(new Rectanglestring {targetrect= new Rectangle(0, 25, 35, 12),whattodraw="" });
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 35, 35, 12), whattodraw = "" });
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 45, 35, 12), whattodraw = "" });
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 65, 35, 12), whattodraw = "" });
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 85, 35, 12), whattodraw = "" });
        testrecs.Add(new Rectanglestring { targetrect = new Rectangle(0, 95, 55, 12), whattodraw = "" });
        string mystringtofit = "This is just an example";

        foreach (Rectanglestring rect in testrecs)
        {
            for (int i = 0; i < mystringtofit.Length; i++)
            {
                if (mystringtofit[i] == ' ' && rect.whattodraw.Length > 0) break;
                if (mystringtofit[i] == ' ') continue;
                string teststring = rect.whattodraw + mystringtofit[i];
                SizeF stringSize = stringSize = e.Graphics.MeasureString(teststring, new Font("Ariel", 12));
                if (stringSize.Width >= rect.targetrect.Width) break;
                rect.whattodraw += mystringtofit[i];


            }

            mystringtofit = mystringtofit.Substring(rect.whattodraw.Length);
            if (mystringtofit.StartsWith(" "))
            {
                mystringtofit = mystringtofit.Substring(1);
            }
            e.Graphics.DrawString(rect.whattodraw, Font, new SolidBrush(ForeColor), rect.targetrect);
        }
        // Call methods of the System.Drawing.Graphics object.

    }
    public class Rectanglestring
    {
       public Rectangle targetrect = new Rectangle();
       public string whattodraw = "";
    }

Answer 4

這就是我所擁有的。 它做了我所描述的。 感謝您的回答。

    public void DrawStringInTextboxes(string text, Graphics g)
    {

        String drawString = text;

        PrivateFontCollection fontCollection = new PrivateFontCollection();
        fontCollection.AddFontFile(System.Web.Hosting.HostingEnvironment.MapPath("~/Content/Fonts/Squidgingtons.ttf"));
        var squidingtonsFontFamily = fontCollection.Families[0];
        Font squidingtons = new Font(squidingtonsFontFamily, textParameters[0].MaxFontSize);
        Font drawFont = new Font("Arial", 60);
        SolidBrush drawBrush = new SolidBrush(Color.Black);

        StringFormat drawFormat = new StringFormat();
        drawFormat.Alignment = StringAlignment.Center;

        char[] delimiterChars = { ' ' };
        string[] words = drawString.Split(delimiterChars);
        string finalString = "";
        int textBoxIndex = 0;

        foreach (string word in words)
        {
            //set the dimensions for the first textbox and create a rectangle with those specifications.
            float x = textParameters[textBoxIndex].Left;
            float y = textParameters[textBoxIndex].Top;
            float width = textParameters[textBoxIndex].Width;
            float height = textParameters[textBoxIndex].Height;
            RectangleF Rect = new RectangleF(x, y, width, height);
            //if the current finalString + the next word fits in the current box, add the word to finalString.
            if (g.MeasureString(finalString + word + " ", squidingtons).Width < textParameters[textBoxIndex].Width) 
            {     
                finalString = finalString + " " + word;
                //if this is the last word, print the finalString and we are done.
                if (word == words[words.Length - 1])
                {
                    g.DrawString(finalString, squidingtons, drawBrush, Rect, drawFormat);
                    break;
                }

            }
            //the current finalString + next word did not fit in the box. Draw what we have to the first box.
            else {
                g.DrawString(finalString, squidingtons, drawBrush, Rect, drawFormat);
                //Hold onto the word that didnt fit. It will be the first word of the next box.
                finalString = word;
                if (textBoxIndex +1 >= textParameters.Length)
                {
                    //if we are out of textboxes, we are done.
                    break;
                }
                else
                {
                    //move on to the next textbox. The loop begins again with new specifications set for the textbox.
                    textBoxIndex++;
                }
            }

        }
        squidingtons.Dispose();
        drawBrush.Dispose();
        drawFont.Dispose();
    }