Terry.Li-彬

虚其心,可解天下之问;专其心,可治天下之学;静其心,可悟天下之理;恒其心,可成天下之业。

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//一个可以在页面上随意画线、多边形、圆,填充等功能的js (part 1)

var jg_ihtm, jg_ie, jg_fast, jg_dom, jg_moz,
jg_n4 = (document.layers && typeof document.classes != "undefined");


function chkDHTM(x, i)
{
  x = document.body || null;
  jg_ie = x && typeof x.insertAdjacentHTML != "undefined";
  jg_dom = (x && !jg_ie &&
    typeof x.appendChild != "undefined" &&
    typeof document.createRange != "undefined" &&
    typeof (i = document.createRange()).setStartBefore != "undefined" &&
    typeof i.createContextualFragment != "undefined");
  jg_ihtm = !jg_ie && !jg_dom && x && typeof x.innerHTML != "undefined";
  jg_fast = jg_ie && document.all && !window.opera;
  jg_moz = jg_dom && typeof x.style.MozOpacity != "undefined";
}


function pntDoc()
{
  this.wnd.document.write(jg_fast? this.htmRpc() : this.htm);
  this.htm = '';
}


function pntCnvDom()
{
  var x = document.createRange();
  x.setStartBefore(this.cnv);
  x = x.createContextualFragment(jg_fast? this.htmRpc() : this.htm);
  this.cnv.appendChild(x);
  this.htm = '';
}


function pntCnvIe()
{
  this.cnv.insertAdjacentHTML("BeforeEnd", jg_fast? this.htmRpc() : this.htm);
  this.htm = '';
}


function pntCnvIhtm()
{
  this.cnv.innerHTML += this.htm;
  this.htm = '';
}


function pntCnv()
{
  this.htm = '';
}


function mkDiv(x, y, w, h)
{
  this.htm += '<div style="position:absolute;'+
    'left:' + x + 'px;'+
    'top:' + y + 'px;'+
    'width:' + w + 'px;'+
    'height:' + h + 'px;'+
    'clip:rect(0,'+w+'px,'+h+'px,0);'+
    'background-color:' + this.color +
    (!jg_moz? ';overflow:hidden' : '')+
    ';"><\/div>';
}


function mkDivIe(x, y, w, h)
{
  this.htm += '%%'+this.color+';'+x+';'+y+';'+w+';'+h+';';
}


function mkDivPrt(x, y, w, h)
{
  this.htm += '<div style="position:absolute;'+
    'border-left:' + w + 'px solid ' + this.color + ';'+
    'left:' + x + 'px;'+
    'top:' + y + 'px;'+
    'width:0px;'+
    'height:' + h + 'px;'+
    'clip:rect(0,'+w+'px,'+h+'px,0);'+
    'background-color:' + this.color +
    (!jg_moz? ';overflow:hidden' : '')+
    ';"><\/div>';
}


function mkLyr(x, y, w, h)
{
  this.htm += '<layer '+
    'left="' + x + '" '+
    'top="' + y + '" '+
    'width="' + w + '" '+
    'height="' + h + '" '+
    'bgcolor="' + this.color + '"><\/layer>\n';
}


var regex = /%%([^;]+);([^;]+);([^;]+);([^;]+);([^;]+);/g;
function htmRpc()
{
  return this.htm.replace(
    regex,
    '<div style="overflow:hidden;position:absolute;background-color:'+
    '$1;left:$2;top:$3;width:$4;height:$5"></div>\n');
}


function htmPrtRpc()
{
  return this.htm.replace(
    regex,
    '<div style="overflow:hidden;position:absolute;background-color:'+
    '$1;left:$2;top:$3;width:$4;height:$5;border-left:$4px solid $1"></div>\n');
}


function mkLin(x1, y1, x2, y2)
{
  if (x1 > x2)
  {
    var _x2 = x2;
    var _y2 = y2;
    x2 = x1;
    y2 = y1;
    x1 = _x2;
    y1 = _y2;
  }
  var dx = x2-x1, dy = Math.abs(y2-y1),
  x = x1, y = y1,
  yIncr = (y1 > y2)? -1 : 1;

  if (dx >= dy)
  {
    var pr = dy<<1,
    pru = pr - (dx<<1),
    p = pr-dx,
    ox = x;
    while ((dx--) > 0)
    {
      ++x;
      if (p > 0)
      {
        this.mkDiv(ox, y, x-ox, 1);
        y += yIncr;
        p += pru;
        ox = x;
      }
      else p += pr;
    }
    this.mkDiv(ox, y, x2-ox+1, 1);
  }

  else
  {
    var pr = dx<<1,
    pru = pr - (dy<<1),
    p = pr-dy,
    oy = y;
    if (y2 <= y1)
    {
      while ((dy--) > 0)
      {
        if (p > 0)
        {
          this.mkDiv(x++, y, 1, oy-y+1);
          y += yIncr;
          p += pru;
          oy = y;
        }
        else
        {
          y += yIncr;
          p += pr;
        }
      }
      this.mkDiv(x2, y2, 1, oy-y2+1);
    }
    else
    {
      while ((dy--) > 0)
      {
        y += yIncr;
        if (p > 0)
        {
          this.mkDiv(x++, oy, 1, y-oy);
          p += pru;
          oy = y;
        }
        else p += pr;
      }
      this.mkDiv(x2, oy, 1, y2-oy+1);
    }
  }
}


function mkLin2D(x1, y1, x2, y2)
{
  if (x1 > x2)
  {
    var _x2 = x2;
    var _y2 = y2;
    x2 = x1;
    y2 = y1;
    x1 = _x2;
    y1 = _y2;
  }
  var dx = x2-x1, dy = Math.abs(y2-y1),
  x = x1, y = y1,
  yIncr = (y1 > y2)? -1 : 1;

  var s = this.stroke;
  if (dx >= dy)
  {
    if (s-3 > 0)
    {
      var _s = (s*dx*Math.sqrt(1+dy*dy/(dx*dx))-dx-(s>>1)*dy) / dx;
      _s = (!(s-4)? Math.ceil(_s) : Math.round(_s)) + 1;
    }
    else var _s = s;
    var ad = Math.ceil(s/2);

    var pr = dy<<1,
    pru = pr - (dx<<1),
    p = pr-dx,
    ox = x;
    while ((dx--) > 0)
    {
      ++x;
      if (p > 0)
      {
        this.mkDiv(ox, y, x-ox+ad, _s);
        y += yIncr;
        p += pru;
        ox = x;
      }
      else p += pr;
    }
    this.mkDiv(ox, y, x2-ox+ad+1, _s);
  }

  else
  {
    if (s-3 > 0)
    {
      var _s = (s*dy*Math.sqrt(1+dx*dx/(dy*dy))-(s>>1)*dx-dy) / dy;
      _s = (!(s-4)? Math.ceil(_s) : Math.round(_s)) + 1;
    }
    else var _s = s;
    var ad = Math.round(s/2);

    var pr = dx<<1,
    pru = pr - (dy<<1),
    p = pr-dy,
    oy = y;
    if (y2 <= y1)
    {
      ++ad;
      while ((dy--) > 0)
      {
        if (p > 0)
        {
          this.mkDiv(x++, y, _s, oy-y+ad);
          y += yIncr;
          p += pru;
          oy = y;
        }
        else
        {
          y += yIncr;
          p += pr;
        }
      }
      this.mkDiv(x2, y2, _s, oy-y2+ad);
    }
    else
    {
      while ((dy--) > 0)
      {
        y += yIncr;
        if (p > 0)
        {
          this.mkDiv(x++, oy, _s, y-oy+ad);
          p += pru;
          oy = y;
        }
        else p += pr;
      }
      this.mkDiv(x2, oy, _s, y2-oy+ad+1);
    }
  }
}


function mkLinDott(x1, y1, x2, y2)
{
  if (x1 > x2)
  {
    var _x2 = x2;
    var _y2 = y2;
    x2 = x1;
    y2 = y1;
    x1 = _x2;
    y1 = _y2;
  }
  var dx = x2-x1, dy = Math.abs(y2-y1),
  x = x1, y = y1,
  yIncr = (y1 > y2)? -1 : 1,
  drw = true;
  if (dx >= dy)
  {
    var pr = dy<<1,
    pru = pr - (dx<<1),
    p = pr-dx;
    while ((dx--) > 0)
    {
      if (drw) this.mkDiv(x, y, 1, 1);
      drw = !drw;
      if (p > 0)
      {
        y += yIncr;
        p += pru;
      }
      else p += pr;
      ++x;
    }
    if (drw) this.mkDiv(x, y, 1, 1);
  }

  else
  {
    var pr = dx<<1,
    pru = pr - (dy<<1),
    p = pr-dy;
    while ((dy--) > 0)
    {
      if (drw) this.mkDiv(x, y, 1, 1);
      drw = !drw;
      y += yIncr;
      if (p > 0)
      {
        ++x;
        p += pru;
      }
      else p += pr;
    }
    if (drw) this.mkDiv(x, y, 1, 1);
  }
}


function mkOv(left, top, width, height)
{
  var a = width>>1, b = height>>1,
  wod = width&1, hod = (height&1)+1,
  cx = left+a, cy = top+b,
  x = 0, y = b,
  ox = 0, oy = b,
  aa = (a*a)<<1, bb = (b*b)<<1,
  st = (aa>>1)*(1-(b<<1)) + bb,
  tt = (bb>>1) - aa*((b<<1)-1),
  w, h;
  while (y > 0)
  {
    if (st < 0)
    {
      st += bb*((x<<1)+3);
      tt += (bb<<1)*(++x);
    }
    else if (tt < 0)
    {
      st += bb*((x<<1)+3) - (aa<<1)*(y-1);
      tt += (bb<<1)*(++x) - aa*(((y--)<<1)-3);
      w = x-ox;
      h = oy-y;
      if (w&2 && h&2)
      {
        this.mkOvQds(cx, cy, -x+2, ox+wod, -oy, oy-1+hod, 1, 1);
        this.mkOvQds(cx, cy, -x+1, x-1+wod, -y-1, y+hod, 1, 1);
      }
      else this.mkOvQds(cx, cy, -x+1, ox+wod, -oy, oy-h+hod, w, h);
      ox = x;
      oy = y;
    }
    else
    {
      tt -= aa*((y<<1)-3);
      st -= (aa<<1)*(--y);
    }
  }
  this.mkDiv(cx-a, cy-oy, a-ox+1, (oy<<1)+hod);
  this.mkDiv(cx+ox+wod, cy-oy, a-ox+1, (oy<<1)+hod);
}
//一个可以在页面上随意画线、多边形、圆,填充等功能的js (part 2)


function mkOv2D(left, top, width, height)
{
  var s = this.stroke;
  width += s-1;
  height += s-1;
  var a = width>>1, b = height>>1,
  wod = width&1, hod = (height&1)+1,
  cx = left+a, cy = top+b,
  x = 0, y = b,
  aa = (a*a)<<1, bb = (b*b)<<1,
  st = (aa>>1)*(1-(b<<1)) + bb,
  tt = (bb>>1) - aa*((b<<1)-1);

  if (s-4 < 0 && (!(s-2) || width-51 > 0 && height-51 > 0))
  {
    var ox = 0, oy = b,
    w, h,
    pxl, pxr, pxt, pxb, pxw;
    while (y > 0)
    {
      if (st < 0)
      {
        st += bb*((x<<1)+3);
        tt += (bb<<1)*(++x);
      }
      else if (tt < 0)
      {
        st += bb*((x<<1)+3) - (aa<<1)*(y-1);
        tt += (bb<<1)*(++x) - aa*(((y--)<<1)-3);
        w = x-ox;
        h = oy-y;

        if (w-1)
        {
          pxw = w+1+(s&1);
          h = s;
        }
        else if (h-1)
        {
          pxw = s;
          h += 1+(s&1);
        }
        else pxw = h = s;
        this.mkOvQds(cx, cy, -x+1, ox-pxw+w+wod, -oy, -h+oy+hod, pxw, h);
        ox = x;
        oy = y;
      }
      else
      {
        tt -= aa*((y<<1)-3);
        st -= (aa<<1)*(--y);
      }
    }
    this.mkDiv(cx-a, cy-oy, s, (oy<<1)+hod);
    this.mkDiv(cx+a+wod-s+1, cy-oy, s, (oy<<1)+hod);
  }

  else
  {
    var _a = (width-((s-1)<<1))>>1,
    _b = (height-((s-1)<<1))>>1,
    _x = 0, _y = _b,
    _aa = (_a*_a)<<1, _bb = (_b*_b)<<1,
    _st = (_aa>>1)*(1-(_b<<1)) + _bb,
    _tt = (_bb>>1) - _aa*((_b<<1)-1),

    pxl = new Array(),
    pxt = new Array(),
    _pxb = new Array();
    pxl[0] = 0;
    pxt[0] = b;
    _pxb[0] = _b-1;
    while (y > 0)
    {
      if (st < 0)
      {
        st += bb*((x<<1)+3);
        tt += (bb<<1)*(++x);
        pxl[pxl.length] = x;
        pxt[pxt.length] = y;
      }
      else if (tt < 0)
      {
        st += bb*((x<<1)+3) - (aa<<1)*(y-1);
        tt += (bb<<1)*(++x) - aa*(((y--)<<1)-3);
        pxl[pxl.length] = x;
        pxt[pxt.length] = y;
      }
      else
      {
        tt -= aa*((y<<1)-3);
        st -= (aa<<1)*(--y);
      }

      if (_y > 0)
      {
        if (_st < 0)
        {
          _st += _bb*((_x<<1)+3);
          _tt += (_bb<<1)*(++_x);
          _pxb[_pxb.length] = _y-1;
        }
        else if (_tt < 0)
        {
          _st += _bb*((_x<<1)+3) - (_aa<<1)*(_y-1);
          _tt += (_bb<<1)*(++_x) - _aa*(((_y--)<<1)-3);
          _pxb[_pxb.length] = _y-1;
        }
        else
        {
          _tt -= _aa*((_y<<1)-3);
          _st -= (_aa<<1)*(--_y);
          _pxb[_pxb.length-1]--;
        }
      }
    }

    var ox = 0, oy = b,
    _oy = _pxb[0],
    l = pxl.length,
    w, h;
    for (var i = 0; i < l; i++)
    {
      if (typeof _pxb[i] != "undefined")
      {
        if (_pxb[i] < _oy || pxt[i] < oy)
        {
          x = pxl[i];
          this.mkOvQds(cx, cy, -x+1, ox+wod, -oy, _oy+hod, x-ox, oy-_oy);
          ox = x;
          oy = pxt[i];
          _oy = _pxb[i];
        }
      }
      else
      {
        x = pxl[i];
        this.mkDiv(cx-x+1, cy-oy, 1, (oy<<1)+hod);
        this.mkDiv(cx+ox+wod, cy-oy, 1, (oy<<1)+hod);
        ox = x;
        oy = pxt[i];
      }
    }
    this.mkDiv(cx-a, cy-oy, 1, (oy<<1)+hod);
    this.mkDiv(cx+ox+wod, cy-oy, 1, (oy<<1)+hod);
  }
}


function mkOvDott(left, top, width, height)
{
  var a = width>>1, b = height>>1,
  wod = width&1, hod = height&1,
  cx = left+a, cy = top+b,
  x = 0, y = b,
  aa2 = (a*a)<<1, aa4 = aa2<<1, bb = (b*b)<<1,
  st = (aa2>>1)*(1-(b<<1)) + bb,
  tt = (bb>>1) - aa2*((b<<1)-1),
  drw = true;
  while (y > 0)
  {
    if (st < 0)
    {
      st += bb*((x<<1)+3);
      tt += (bb<<1)*(++x);
    }
    else if (tt < 0)
    {
      st += bb*((x<<1)+3) - aa4*(y-1);
      tt += (bb<<1)*(++x) - aa2*(((y--)<<1)-3);
    }
    else
    {
      tt -= aa2*((y<<1)-3);
      st -= aa4*(--y);
    }
    if (drw) this.mkOvQds(cx, cy, -x, x+wod, -y, y+hod, 1, 1);
    drw = !drw;
  }
}


//一个可以在页面上随意画线、多边形、圆,填充等功能的js (part 3)

function mkRect(x, y, w, h)
{
  var s = this.stroke;
  this.mkDiv(x, y, w, s);
  this.mkDiv(x+w, y, s, h);
  this.mkDiv(x, y+h, w+s, s);
  this.mkDiv(x, y+s, s, h-s);
}


function mkRectDott(x, y, w, h)
{
  this.drawLine(x, y, x+w, y);
  this.drawLine(x+w, y, x+w, y+h);
  this.drawLine(x, y+h, x+w, y+h);
  this.drawLine(x, y, x, y+h);
}


function jsgFont()
{
  this.PLAIN = 'font-weight:normal;';
  this.BOLD = 'font-weight:bold;';
  this.ITALIC = 'font-style:italic;';
  this.ITALIC_BOLD = this.ITALIC + this.BOLD;
  this.BOLD_ITALIC = this.ITALIC_BOLD;
}
var Font = new jsgFont();


function jsgStroke()
{
  this.DOTTED = -1;
}
var Stroke = new jsgStroke();


function jsGraphics(id, wnd)
{
  this.setColor = new Function('arg', 'this.color = arg.toLowerCase();');

  this.setStroke = function(x)
  {
    this.stroke = x;
    if (!(x+1))
    {
      this.drawLine = mkLinDott;
      this.mkOv = mkOvDott;
      this.drawRect = mkRectDott;
    }
    else if (x-1 > 0)
    {
      this.drawLine = mkLin2D;
      this.mkOv = mkOv2D;
      this.drawRect = mkRect;
    }
    else
    {
      this.drawLine = mkLin;
      this.mkOv = mkOv;
      this.drawRect = mkRect;
    }
  };


  this.setPrintable = function(arg)
  {
    this.printable = arg;
    if (jg_fast)
    {
      this.mkDiv = mkDivIe;
      this.htmRpc = arg? htmPrtRpc : htmRpc;
    }
    else this.mkDiv = jg_n4? mkLyr : arg? mkDivPrt : mkDiv;
  };


  this.setFont = function(fam, sz, sty)
  {
    this.ftFam = fam;
    this.ftSz = sz;
    this.ftSty = sty || Font.PLAIN;
  };


  this.drawPolyline = this.drawPolyLine = function(x, y, s)
  {
    for (var i=0 ; i<x.length-1 ; i++ )
      this.drawLine(x[i], y[i], x[i+1], y[i+1]);
  };


  this.fillRect = function(x, y, w, h)
  {
    this.mkDiv(x, y, w, h);
  };


  this.drawPolygon = function(x, y)
  {
    this.drawPolyline(x, y);
    this.drawLine(x[x.length-1], y[x.length-1], x[0], y[0]);
  };


  this.drawEllipse = this.drawOval = function(x, y, w, h)
  {
    this.mkOv(x, y, w, h);
  };


  this.fillEllipse = this.fillOval = function(left, top, w, h)
  {
    var a = (w -= 1)>>1, b = (h -= 1)>>1,
    wod = (w&1)+1, hod = (h&1)+1,
    cx = left+a, cy = top+b,
    x = 0, y = b,
    ox = 0, oy = b,
    aa2 = (a*a)<<1, aa4 = aa2<<1, bb = (b*b)<<1,
    st = (aa2>>1)*(1-(b<<1)) + bb,
    tt = (bb>>1) - aa2*((b<<1)-1),
    pxl, dw, dh;
    if (w+1) while (y > 0)
    {
      if (st < 0)
      {
        st += bb*((x<<1)+3);
        tt += (bb<<1)*(++x);
      }
      else if (tt < 0)
      {
        st += bb*((x<<1)+3) - aa4*(y-1);
        pxl = cx-x;
        dw = (x<<1)+wod;
        tt += (bb<<1)*(++x) - aa2*(((y--)<<1)-3);
        dh = oy-y;
        this.mkDiv(pxl, cy-oy, dw, dh);
        this.mkDiv(pxl, cy+oy-dh+hod, dw, dh);
        ox = x;
        oy = y;
      }
      else
      {
        tt -= aa2*((y<<1)-3);
        st -= aa4*(--y);
      }
    }
    this.mkDiv(cx-a, cy-oy, w+1, (oy<<1)+hod);
  };

  this.fillPolygon = function(array_x, array_y)
  {
    var i;
    var y;
    var miny, maxy;
    var x1, y1;
    var x2, y2;
    var ind1, ind2;
    var ints;

    var n = array_x.length;

    if (!n) return;


    miny = array_y[0];
    maxy = array_y[0];
    for (i = 1; i < n; i++)
    {
      if (array_y[i] < miny)
        miny = array_y[i];

      if (array_y[i] > maxy)
        maxy = array_y[i];
    }
    for (y = miny; y <= maxy; y++)
    {
      var polyInts = new Array();
      ints = 0;
      for (i = 0; i < n; i++)
      {
        if (!i)
        {
          ind1 = n-1;
          ind2 = 0;
        }
        else
        {
          ind1 = i-1;
          ind2 = i;
        }
        y1 = array_y[ind1];
        y2 = array_y[ind2];
        if (y1 < y2)
        {
          x1 = array_x[ind1];
          x2 = array_x[ind2];
        }
        else if (y1 > y2)
        {
          y2 = array_y[ind1];
          y1 = array_y[ind2];
          x2 = array_x[ind1];
          x1 = array_x[ind2];
        }
        else continue;

        if ((y >= y1) && (y < y2))
          polyInts[ints++] = Math.round((y-y1) * (x2-x1) / (y2-y1) + x1);

        else if ((y == maxy) && (y > y1) && (y <= y2))
          polyInts[ints++] = Math.round((y-y1) * (x2-x1) / (y2-y1) + x1);
      }
      polyInts.sort(integer_compare);

      for (i = 0; i < ints; i+=2)
      {
        w = polyInts[i+1]-polyInts[i]
        this.mkDiv(polyInts[i], y, polyInts[i+1]-polyInts[i]+1, 1);
      }
    }
  };


  this.drawString = function(txt, x, y)
  {
    this.htm += '<div style="position:absolute;white-space:nowrap;'+
      'left:' + x + 'px;'+
      'top:' + y + 'px;'+
      'font-family:' + this.ftFam + ';'+
      'font-size:' + this.ftSz + ';'+
      'color:' + this.color + ';' + this.ftSty + '">'+
      txt +
      '<\/div>';
  }


  this.drawImage = function(imgSrc, x, y, w, h)
  {
    this.htm += '<div style="position:absolute;'+
      'left:' + x + 'px;'+
      'top:' + y + 'px;'+
      'width:' + w + ';'+
      'height:' + h + ';">'+
      '<img src="' + imgSrc + '" width="' + w + '" height="' + h + '">'+
      '<\/div>';
  }


  this.clear = function()
  {
    this.htm = "";
    if (this.cnv) this.cnv.innerHTML = this.defhtm;
  };


  this.mkOvQds = function(cx, cy, xl, xr, yt, yb, w, h)
  {
    this.mkDiv(xr+cx, yt+cy, w, h);
    this.mkDiv(xr+cx, yb+cy, w, h);
    this.mkDiv(xl+cx, yb+cy, w, h);
    this.mkDiv(xl+cx, yt+cy, w, h);
  };

  this.setStroke(1);
  this.setFont('verdana,geneva,helvetica,sans-serif', String.fromCharCode(0x31, 0x32, 0x70, 0x78), Font.PLAIN);
  this.color = '#000000';
  this.htm = '';
  this.wnd = wnd || window;

  if (!(jg_ie || jg_dom || jg_ihtm)) chkDHTM();
  if (typeof id != 'string' || !id) this.paint = pntDoc;
  else
  {
    this.cnv = document.all? (this.wnd.document.all[id] || null)
      : document.getElementById? (this.wnd.document.getElementById(id) || null)
      : null;
    this.defhtm = (this.cnv && this.cnv.innerHTML)? this.cnv.innerHTML : '';
    this.paint = jg_dom? pntCnvDom : jg_ie? pntCnvIe : jg_ihtm? pntCnvIhtm : pntCnv;
  }

  this.setPrintable(false);
}

function integer_compare(x,y)
{
  return (x < y) ? -1 : ((x > y)*1);
}


 

posted on 2007-10-06 01:03 礼物 阅读(1744) 评论(0)  编辑  收藏

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