如何添加文字包装到Magick ++中的文本 [英] How to add word wrapping to texts in Magick++

问题描述

我要通过这样做，向Magick ++中的图片添加文字：

方法1：

  Magick :: Image image（Magick :: Geometry（800,800），Magick :: Color（white））; 
 Magick ::颜色（0,0,0,0）; 
 image.font（Waree）; 
 image.fontPointsize（36）; 
 image.strokeColor（color）; 
 image.fillColor（color）; 
 image.annotate（HelloWorld！，NorthWestGravity）;方法2： 
  Magick :: Image image（Magick :: Geometry（800,800），Magick :: Color（white））; 
 Magick ::颜色（0,0,0,0）; 
 std :: list< Magick :: Drawable> text_draw_list; 
 text_draw_list.push_back（Magick :: DrawableViewbox（0,0，image.columns（），image.rows（）））; 
 text_draw_list.push_back（Magick :: DrawableFont（Waree，（Magick :: StyleType）NormalStyle，400，（Magick :: StretchType）NormalStretch））; 
 text_draw_list.push_back（Magick :: DrawablePointSize（36））; 
 //手动偏移
 text_draw_list.push_back（Magick :: DrawableText（0，200，HelloWorld！））; 
 text_draw_list.push_back（Magick :: DrawableStrokeColor（color））; 
 text_draw_list.push_back（Magick :: DrawableFillColor（color））; 
 image.draw（text_draw_list）; 
  
方法1计算给定重力的最佳偏移，但如果文本不在
 
 
 
方法2具有方法1的问题，并假定已计算正确的偏移量，以便将文本写入正确的位置。
 
 
 
 如何将自动换行功能添加到这两种方法中的任一种，但最好使用方法1？ 
 
 
 
 PS：ImageMagick通过使用字幕 选项自动换行，但找不到  Magick ++。
 
 
 
编辑：基于字体大小的边框控制。
  Magick :: Image image（Magick :: Geometry（800,800），Magick :: Color（white））; 
 Magick ::颜色（0,0,0,0）; 
 image.font（Waree）; 
 image.fontPointsize（36）; 
 image.strokeColor（color）; 
 image.fillColor（color）; 
 std :: string txt =HelloWorld！; 
 Magick :: TypeMetric typeMetrics; 
 double fontSize = 36; 
 image.fontTypeMetrics（txt，& typeMetrics）; 
 while（fontSize> 0）
 {
 if（typeMetrics.textWidth（）> = image.columns（）|| typeMetrics.textHeight（）> = image.rows ）
 {
 fontSize--; 
 image.fontTypeMetrics（txt，& typeMetrics）; 
} 
} 
 image.annotate（txt，NorthWestGravity）; 
  
 
 
解决方案
最好的办法是阅读 
 
I am trying to add texts to images in Magick++ by doing so:

Method 1:
Magick::Image image(Magick::Geometry(800,800),Magick::Color("white"));
Magick::Color color(0,0,0,0);
image.font("Waree");
image.fontPointsize(36);
image.strokeColor(color);
image.fillColor(color);
image.annotate("HelloWorld!", NorthWestGravity);
Method 2:
Magick::Image image(Magick::Geometry(800,800),Magick::Color("white"));
Magick::Color color(0,0,0,0);
std::list<Magick::Drawable> text_draw_list;
text_draw_list.push_back(Magick::DrawableViewbox(0,0,image.columns(), image.rows()));
text_draw_list.push_back(Magick::DrawableFont("Waree", (Magick::StyleType)NormalStyle, 400, (Magick::StretchType)NormalStretch ));
text_draw_list.push_back(Magick::DrawablePointSize(36));
//Manual offsets
text_draw_list.push_back(Magick::DrawableText(0, 200, "HelloWorld!"));
text_draw_list.push_back(Magick::DrawableStrokeColor(color));
text_draw_list.push_back(Magick::DrawableFillColor(color));
image.draw(text_draw_list);
Method 1 calculates best offsets given the gravity but does not have any word wrapping if the text is out of bounds of the image.

Method 2 has Method 1's problem plus it assumes that the correct offsets have been calculated so the text is written at the correct position.

How do I add automatic word wrapping to either of the 2 methods but preferably to method 1?

P.S: ImageMagick has automatic word wrapping by using the caption option but I couldn't find caption in Magick++.

Edit: Ugly boundary control based on font size.
Magick::Image image(Magick::Geometry(800,800),Magick::Color("white"));
Magick::Color color(0,0,0,0);
image.font("Waree");
image.fontPointsize(36);
image.strokeColor(color);
image.fillColor(color);
std::string txt = "HelloWorld!";
Magick::TypeMetric typeMetrics;
double fontSize = 36;
image.fontTypeMetrics(txt, &typeMetrics);
while(fontSize > 0)
{
 if(typeMetrics.textWidth() >= image.columns() || typeMetrics.textHeight() >= image.rows())
 {
  fontSize--;
  image.fontTypeMetrics(txt, &typeMetrics);
 }
}
image.annotate(txt, NorthWestGravity);

解决方案
The best thing to do is read the caption.c source, and understand how word-wrapping is implemented. This would allow your application to have full control.

Another options would be to use PANGO: protocol. This would allow your content-author to have full control of word-wrapping, format, and many other font-display features.

But for the quickest approach, as you mentioned, caption already does this. But caption is not a method, but a file protocol.
#include <Magick++.h>

using namespace Magick;

int main(int argc, const char * argv[]) {
    InitializeMagick(argv[0]);
    Image words(Geometry(250,250), Color("white"));
    words.backgroundColor(Color("lime")); // might not be needed.
    words.font("Avenir-Heavy");
    words.fillColor(Color("firebrick"));
    words.strokeColor(Color("yellow"));
    words.read("CAPTION:Hello World!"); // <---- CAPTION: protocol
    words.write("/tmp/words.jpg");
    return 0;
}


                        
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