Info Catalog asymptote: tube asymptote: Base modules asymptote: contour

asymptote: flowchart

 
 8.35 'flowchart'
 ================
 
 This package provides routines for drawing flowcharts.  The primary
 structure is a 'block', which represents a single block on the
 flowchart.  The following eight functions return a position on the
 appropriate edge of the block, given picture transform 't':
 
 pair block.top(transform t=identity());
 pair block.left(transform t=identity());
 pair block.right(transform t=identity());
 pair block.bottom(transform t=identity());
 pair block.topleft(transform t=identity());
 pair block.topright(transform t=identity());
 pair block.bottomleft(transform t=identity());
 pair block.bottomright(transform t=identity());
 
 To obtain an arbitrary position along the boundary of the block in user
 coordinates, use:
 pair block.position(real x, transform t=identity());
 
 The center of the block in user coordinates is stored in 'block.center'
 and the block size in 'PostScript' coordinates is given by 'block.size'.
 
 A frame containing the block is returned by
 frame block.draw(pen p=currentpen);
 
    The following block generation routines accept a Label, string, or
 frame for their object argument:
 
 "rectangular block with an optional header (and padding 'dx' around header and body):"
      block rectangle(object header, object body, pair center=(0,0),
                      pen headerpen=mediumgray, pen bodypen=invisible,
                      pen drawpen=currentpen,
                      real dx=3, real minheaderwidth=minblockwidth,
                      real minheaderheight=minblockwidth,
                      real minbodywidth=minblockheight,
                      real minbodyheight=minblockheight);
      block rectangle(object body, pair center=(0,0),
                      pen fillpen=invisible, pen drawpen=currentpen,
                      real dx=3, real minwidth=minblockwidth,
                      real minheight=minblockheight);
 
 "parallelogram block:"
      block parallelogram(object body, pair center=(0,0),
                          pen fillpen=invisible, pen drawpen=currentpen,
                          real dx=3, real slope=2,
                          real minwidth=minblockwidth,
                          real minheight=minblockheight);
 
 "diamond-shaped block:"
      block diamond(object body, pair center=(0,0),
                    pen fillpen=invisible, pen drawpen=currentpen,
                    real ds=5, real dw=1,
                    real height=20, real minwidth=minblockwidth,
                    real minheight=minblockheight);
 
 "circular block:"
      block circle(object body, pair center=(0,0), pen fillpen=invisible,
                   pen drawpen=currentpen, real dr=3,
                   real mindiameter=mincirclediameter);
 
 "rectangular block with rounded corners:"
      block roundrectangle(object body, pair center=(0,0),
                           pen fillpen=invisible, pen drawpen=currentpen,
                           real ds=5, real dw=0, real minwidth=minblockwidth,
                           real minheight=minblockheight);
 
 "rectangular block with beveled edges:"
      block bevel(object body, pair center=(0,0), pen fillpen=invisible,
                  pen drawpen=currentpen, real dh=5, real dw=5,
                  real minwidth=minblockwidth, real minheight=minblockheight);
 
    To draw paths joining the pairs in 'point' with right-angled lines,
 use the routine:
 path path(pair point[] ... flowdir dir[]);
 The entries in 'dir' identify whether successive segments between the
 pairs specified by 'point' should be drawn in the 'Horizontal' or
 'Vertical' direction.
 
    Here is a simple flowchart example (see also the example
 'controlsystem.asy'):
 
 size(0,300);
 
 import flowchart;
 
 block block1=rectangle(Label("Example",magenta),
 		       pack(Label("Start:",heavygreen),"",Label("$A:=0$",blue),
 			    "$B:=1$"),(-0.5,3),palegreen,paleblue,red);
 block block2=diamond(Label("Choice?",blue),(0,2),palegreen,red);
 block block3=roundrectangle("Do something",(-1,1));
 block block4=bevel("Don't do something",(1,1));
 block block5=circle("End",(0,0));
 
 draw(block1);
 draw(block2);
 draw(block3);
 draw(block4);
 draw(block5);
 
 add(new void(picture pic, transform t) {
     blockconnector operator --=blockconnector(pic,t);
     //    draw(pic,block1.right(t)--block2.top(t));
     block1--Right--Down--Arrow--block2;
     block2--Label("Yes",0.5,NW)--Left--Down--Arrow--block3;
     block2--Right--Label("No",0.5,NE)--Down--Arrow--block4;
     block4--Down--Left--Arrow--block5;
     block3--Down--Right--Arrow--block5;
   });
 
                             [flowchartdemo]
 

Info Catalog asymptote: tube asymptote: Base modules asymptote: contour