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shape-inside.js
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shape-inside.js
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var ctx;
function shapeinside(element, shape, options){
var sheight = 16;
if ('lineheight' in options){
sheight = options['lineheight'];
}
var withoutline = false;
if ('withoutline' in options){
withoutline = options['withoutline'];
}
var withredline = 20;
if ('withredline' in options){
withredline = options['withredline'];
}
var fontface = 'Tahoma';
if ('fontface' in options){
fontface = options['fontface'];
}
var redline = true;
var currentelement = document.getElementById(element);
var myshape = shape.replace('polygon(', '');
myshape = myshape.replace(')', '');
myshape = myshape.split(' ');
var arshape = [];
var ts = '';
for (si in myshape){
if (myshape[si]!=''){
ts = myshape[si].split(',');
arshape.push([parseInt(ts[0]), parseInt(ts[1])]);
}
}
var mywidth = currentelement.offsetWidth;
var myheight = currentelement.offsetHeight;
if (arshape.length==0){
arshape = [[0, 0], [mywidth, 0], [mywidth, myheight], [0, myheight], [0, 0]];
}
var shapetext = currentelement.innerHTML.replace(/\r\n/g, '\n').replace(/\n/g, '\n ');
shapetext = shapetext.split(' ');
currentelement.innerHTML = '<canvas id="shape-inside-canvas" width="'+mywidth+'" height="'+myheight+'"></canvas>';
var c=document.getElementById("shape-inside-canvas");
ctx=c.getContext("2d");
if (withoutline){
drawshape(arshape);
}
var fpy = getfpy(arshape);
var pshapetext = [];
while (shapetext.length){
var fp = getfirstpoint(arshape, sheight, fpy);
var lp = getlastpoint(arshape, sheight, fpy);
if (isNaN(fp[0])){
fp[0] = 0;
}
if (isNaN(lp[0])){
lp[0] = mywidth;
}
pshapetext = shapetext;
shapetext = drawline(fp, lp, sheight, arshape, shapetext, redline, withredline, fontface);
redline = shapetext[1];
shapetext = shapetext[0];
fpy = fpy+sheight;
}
}
function drawshape(arshape){
var first = true;
for (ari in arshape){
if (first){
ctx.moveTo(arshape[ari][0],arshape[ari][1]);
first = false;
}
else {
ctx.lineTo(arshape[ari][0],arshape[ari][1]);
ctx.stroke();
}
}
}
function getfirstpoint(arshape, sheight, fpy){
var fpxar = [];
//get ~ width
var minwx = 999999999;
var maxwx = 0;
for (ari in arshape){
if (arshape[ari][0]<minwx){
minwx = arshape[ari][0];
}
if (arshape[ari][0]>maxwx){
maxwx = arshape[ari][0];
}
}
var awidth = maxwx-minwx;
var maxfx = 0;
var cflag = false;
//get points between top of string and bot of string
for (ari in arshape){
if (arshape[ari][1]>=fpy && arshape[ari][1]<=(fpy+sheight) && arshape[ari][0]<(awidth/2 + minwx) && arshape[ari][0]>maxfx){
maxfx = arshape[ari][0];
cflag = true;
}
}
if (!cflag){
var mintp = [];
var minbp = [];
var cc = 999999999;
var lx = 0;
for (ari in arshape){
if (ari==(arshape.length-1)){
break;
}
// point ari -> ari+1 line cross y=fpy
lx = (arshape[ari][0]*arshape[parseInt(ari)+1][1]-arshape[parseInt(ari)+1][0]*arshape[ari][1]-(arshape[ari][0]-arshape[parseInt(ari)+1][0])*fpy)/(arshape[parseInt(ari)+1][1]-arshape[ari][1]);
// is lx between ari and ari+1, is fpy between ari and ari+1, is lx min
if (((arshape[ari][1]-fpy)*(arshape[parseInt(ari)+1][1]-fpy))<0 && ((arshape[ari][0]-lx)*(arshape[parseInt(ari)+1][0]-lx))<0 && lx<cc){
if (arshape[ari][1]>arshape[parseInt(ari)+1][1]){
mintp = arshape[ari];
minbp = arshape[parseInt(ari)+1];
}
else {
mintp = arshape[parseInt(ari)+1];
minbp = arshape[ari];
}
cc = lx;
}
}
//get maxfx from line formula
var maxfx1 = (minbp[0]*mintp[1]-mintp[0]*minbp[1]-(minbp[0]-mintp[0])*fpy)/(mintp[1]-minbp[1]);
var maxfx2 = (minbp[0]*mintp[1]-mintp[0]*minbp[1]-(minbp[0]-mintp[0])*(fpy+sheight))/(mintp[1]-minbp[1]);
if (maxfx1>maxfx2){
maxfx = maxfx1;
}
else {
maxfx = maxfx2;
}
}
maxfx = Math.ceil(maxfx);
return [maxfx, fpy];
}
function getlastpoint(arshape, sheight, fpy){
var fpxar = [];
//get ~ width
var minwx = 999999999;
var maxwx = 0;
for (ari in arshape){
if (arshape[ari][0]<minwx){
minwx = arshape[ari][0];
}
if (arshape[ari][0]>maxwx){
maxwx = arshape[ari][0];
}
}
var awidth = maxwx-minwx;
var maxfx = 999999999;
var cflag = false;
//get points between top of string and bot of string
for (ari in arshape){
if (arshape[ari][1]>=fpy && arshape[ari][1]<=(fpy+sheight) && arshape[ari][0]>(awidth/2 + minwx) && arshape[ari][0]<maxfx){
maxfx = arshape[ari][0];
cflag = true;
}
}
if (!cflag){
var mintp = [];
var minbp = [];
var lx = 0;
var cc = 0;
for (ari in arshape){
if (ari==(arshape.length-1)){
break;
}
// point ari -> ari+1 line cross y=fpy
lx = (arshape[ari][0]*arshape[parseInt(ari)+1][1]-arshape[parseInt(ari)+1][0]*arshape[ari][1]-(arshape[ari][0]-arshape[parseInt(ari)+1][0])*fpy)/(arshape[parseInt(ari)+1][1]-arshape[ari][1]);
// is lx between ari and ari+1, is fpy between ari and ari+1, is lx max
if (((arshape[ari][1]-fpy)*(arshape[parseInt(ari)+1][1]-fpy))<0 && ((arshape[ari][0]-lx)*(arshape[parseInt(ari)+1][0]-lx))<0 && lx>cc){
if (arshape[ari][1]>arshape[parseInt(ari)+1][1]){
mintp = arshape[ari];
minbp = arshape[parseInt(ari)+1];
}
else {
mintp = arshape[parseInt(ari)+1];
minbp = arshape[ari];
}
cc = lx;
}
}
//get maxfx from line formula
var maxfx1 = (minbp[0]*mintp[1]-mintp[0]*minbp[1]-(minbp[0]-mintp[0])*fpy)/(mintp[1]-minbp[1]);
var maxfx2 = (minbp[0]*mintp[1]-mintp[0]*minbp[1]-(minbp[0]-mintp[0])*(fpy+sheight))/(mintp[1]-minbp[1]);
if (maxfx1<maxfx2){
maxfx = maxfx2;
}
else {
maxfx = maxfx1;
}
}
maxfx = Math.ceil(maxfx);
return [maxfx, fpy];
}
function drawline(fp, lp, sheight, arshape, shapetext, redline, withredline, fontface){
var countWords = shapetext.length;
var line = "";
var redx = 0;
if (redline && withredline){
redx = withredline;
redline = false;
}
var counter = 0;
for (var n = 0; n < countWords; n++) {
ctx.font = 'normal '+sheight+'px '+fontface;
var testLine = line + shapetext[n] + " ";
var testWidth = ctx.measureText(testLine).width;
if (testWidth>(lp[0]-fp[0]-redx) || /\r|\n/.exec(line)){
if (/\r|\n/.exec(line) || line==''){
redline = true;
}
ctx.fillText(line, fp[0]+redx, fp[1]+sheight);
counter = n;
break;
}
else {
line = testLine;
}
if (n==(countWords-1)){
ctx.fillText(line, fp[0]+redx, fp[1]+sheight);
counter = n+1;
}
}
return [shapetext.slice(counter), redline];
}
function getfpy(arshape){
//get ~ height
var minwy = 999999999;
var maxwy = 0;
for (ari in arshape){
if (arshape[ari][1]<minwy){
minwy = arshape[ari][1];
}
if (arshape[ari][1]>maxwy){
maxwy = arshape[ari][1];
}
}
var aheight = maxwy-minwy;
var fpm=0;
for (ari in arshape){
if (ari==0){
if (arshape[ari][1]>arshape[parseInt(ari)+1][1] && arshape[ari][1]>arshape[parseInt(arshape.length)-1][1] && arshape[ari][1]>fpm && arshape[ari][1]<(aheight/2+minwy)){
fpm = arshape[ari][1];
}
}
else if (ari==(parseInt(arshape.length)-1)){
if (arshape[ari][1]>arshape[parseInt(ari)-1][1] && arshape[ari][1]>arshape[0][1] && arshape[ari][1]>fpm && arshape[ari][1]<(aheight/2+minwy)){
fpm = arshape[ari][1];
}
}
else if (arshape[ari][1]>arshape[parseInt(ari)+1][1] && arshape[ari][1]>arshape[parseInt(ari)-1][1] && arshape[ari][1]>fpm && arshape[ari][1]<(aheight/2+minwy)){
fpm = arshape[ari][1];
}
}
if (fpm == 0){
fpm = minwy;
}
return fpm+1;
}