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#include <Magick++.h>

using namespace Magick;

typedef struct { 
  char color[64];
  int  width;
  float opacity;
  double dash[10];
} LineDescription;

static Image * _pImg = NULL;

static void SetLineStyle(LineDescription & line)
{
  Color clear(0,0,0,TransparentOpacity);
  _pImg->fillColor(clear);
  Color line_color(line.color);
  line_color.alpha(1.0 - line.opacity);
  _pImg->strokeColor(line_color);
  _pImg->strokeWidth(line.width);
  line.dash[0] <= 0.0 ? 
	_pImg->strokeDashArray(NULL) :
	_pImg->strokeDashArray(line.dash);
}

int main(void)
{
  _pImg = new Image(Geometry(640,640),"black");

  system("rm test.jpg");

  int major_gap = 50;
  int minor_gap = 10;

  LineDescription major;
  strncpy(major.color,"white",64);
  major.width = 1;
  major.opacity = 0.6;
  major.dash[0] = 0.5;
  major.dash[1] = 2.5;
  major.dash[2] = 0.0;

  LineDescription minor;
  strncpy(minor.color,"gray",64);
  minor.width = 1;
  minor.opacity = 0.4;
  minor.dash[0] = 0.5;
  minor.dash[1] = 1.5;
  minor.dash[2] = 0.0;

  SetLineStyle(minor);

  for(int col = minor_gap; col < 640; col += minor_gap)
	{
	  _pImg->draw(DrawableLine(col, 0, col, 640));
	}

  for(int row = minor_gap; row < 640; row += minor_gap)
	{
	  _pImg->draw(DrawableLine(0, row, 640, row));
	}


  SetLineStyle(major);

  for(int col = major_gap; col < 640; col += major_gap)
	{
	  _pImg->draw(DrawableLine(col, 0, col, 640));
	}

  for(int row = major_gap; row < 640; row += major_gap)
	{
	  _pImg->draw(DrawableLine(0, row, 640, row));
	}

  _pImg->write("test.jpg");

  system("display test.jpg &");

  return 0;
}