Function changeStyle

stackgl_modules/index.js:39160–39221

(oldStyle, newStyle)

  }

  function changeStyle(oldStyle, newStyle) {
    var ctxFont = "" + context.font;

    if(styletags.subscripts === true) {
      var oldIndex_Sub = oldStyle.indexOf(CHR_sub0);
      var newIndex_Sub = newStyle.indexOf(CHR_sub0);

      var oldSub = (oldIndex_Sub > -1) ? parseInt(oldStyle[1 + oldIndex_Sub]) : 0;
      var newSub = (newIndex_Sub > -1) ? parseInt(newStyle[1 + newIndex_Sub]) : 0;

      if(oldSub !== newSub) {
        ctxFont = ctxFont.replace(getTextFontSize(), "?px ")
        zPos *= Math.pow(0.75, (newSub - oldSub))
        ctxFont = ctxFont.replace("?px ", getTextFontSize())
      }
      yPos += 0.25 * lineHeight * (newSub - oldSub);
    }

    if(styletags.superscripts === true) {
      var oldIndex_Super = oldStyle.indexOf(CHR_super0);
      var newIndex_Super = newStyle.indexOf(CHR_super0);

      var oldSuper = (oldIndex_Super > -1) ? parseInt(oldStyle[1 + oldIndex_Super]) : 0;
      var newSuper = (newIndex_Super > -1) ? parseInt(newStyle[1 + newIndex_Super]) : 0;

      if(oldSuper !== newSuper) {
        ctxFont = ctxFont.replace(getTextFontSize(), "?px ")
        zPos *= Math.pow(0.75, (newSuper - oldSuper))
        ctxFont = ctxFont.replace("?px ", getTextFontSize())
      }
      yPos -= 0.25 * lineHeight * (newSuper - oldSuper);
    }

    if(styletags.bolds === true) {
      var wasBold = (oldStyle.indexOf(CHR_bold) > -1)
      var is_Bold = (newStyle.indexOf(CHR_bold) > -1)

      if(!wasBold && is_Bold) {
        if(wasItalic) {
          ctxFont = ctxFont.replace("italic ", "italic bold ")
        } else {
          ctxFont = "bold " + ctxFont
        }
      }
      if(wasBold && !is_Bold) {
        ctxFont = ctxFont.replace("bold ", '')
      }
    }

    if(styletags.italics === true) {
      var wasItalic = (oldStyle.indexOf(CHR_italic) > -1)
      var is_Italic = (newStyle.indexOf(CHR_italic) > -1)

      if(!wasItalic && is_Italic) {
        ctxFont = "italic " + ctxFont
      }
      if(wasItalic && !is_Italic) {
        ctxFont = ctxFont.replace("italic ", '')