PHPOffice-PowerPoint：如何在PowerPoint幻灯片中绘制虚线？

Question

我想使用PHPOffice在PowerPoint演示文稿中生成虚线，但只能生成实线或双线。

行生成器代码

$shape->getBorder()
      ->setColor($color)
      ->setLineStyle(Border::LINE_SOLID);

如何正确生成虚线？

短划线生成代码

$shape->getBorder()->setDashStyle(Border::DASH_DASH);

Answer 1

我最终使用以下方案生成了一条虚线。

我求助于生成恒定长度的短线段，而与起点（线的斜率）的方向无关。

对于等长的倾斜线，我如何生成短线段是分几个步骤进行的。

算法

 0)  Initialize dashLen to an arbitrary value so that we increment to
     2x dashlen on each iteration of loop to cause empty holes to appear in
     line 
 1)  Calculate length of line    d=sqrt(dx*dx+dy*dy) 
 2)  Calculate negative slope since in the y axis is flipped (Y increases as points traverse screen space in downward direction)
 3)  Loop $x and $y and
     increment $y such that 
     $y += 2*$dashLen*sin(atan($m));
     $x -= 2*$dashLen*cos(atan($m));
 4)  Update endpoints

     $endY = $startY + (($dashLen)*sin(atan($m))); 
     $endX = $startX - (($dashLen)*cos(atan($m))); 
 5)  Draw Line Segments (dashes)

代码段

$d = sqrt(pow($toY-$fromY, 2) + pow($toX-$fromX, 2));
if ($toX != $fromX)
{
      $m = ($toY-$fromY)/($fromX-$toX);
      $dashLen = 2;
      for ($y = $fromY, $x = $fromX; $y < $toY || $x > $toX; $y += ((2*$dashLen*sin(atan($m)))), $x -= (2*$dashLen*cos(atan($m))))
      {   
          $startX = $x;
          $startY = $y;

          $endY = $startY + (($dashLen)*sin(atan($m))); 
          $endX = $startX - (($dashLen)*cos(atan($m)));

          $shape = $currentSlide->createLineShape($startX, $startY, $endX, $endY);


          $color = new Color('FF000000');


          $shape->getFill()
                ->setFillType(Fill::FILL_SOLID)
                ->setStartColor($color)
                ->setEndColor($color);
          $shape->getBorder()
                ->setColor($color)->setLineWidth(2)
                ->setLineStyle($this->getCategoryLine($category));  
      } 
}
else
{

      $dashLen = 2;
      for ($y = $toY; $y > $fromY; $y -= 2*$dashLen)
      {   
          $startX = $fromX;
          $startY = $y;
          $endX = $toX;
          $endY = $y - ($dashLen);             

          $shape = $currentSlide->createLineShape($startX, $startY, $endX, $endY);

          $color = new Color('FF000000');
           $shape->getFill()
                 ->setFillType(Fill::FILL_SOLID)
                 ->setStartColor($color)
                 ->setEndColor($color);
           $shape->getBorder()
                 ->setColor($color)->setLineWidth(2)
                 ->setLineStyle(); 
      }  
}