private void draw()
{
Utils.log("draw", "Lookahead({0}), TokenType({1}), Caret({2})", getCurrentToken(), lookahead(), this.currentDrawToken);
LayoutGroup lg;
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
switch (lookahead())
{
// Basic Terminals
case TokenType.DIGIT:
Utils.log("draw", "Drawing digit");
AddTextBox(lexeme(), fontSizes.Peek());
accept(TokenType.DIGIT);
break;
case TokenType.OPEN_PAREN:
accept(TokenType.OPEN_PAREN);
lg = new LayoutGroup(LayoutGroupType.REL_POS_RIGHT);
lg.setWrapperParens();
layoutGroupCurrent.Push(lg);
while (lookahead() != TokenType.CLOSE_PAREN && !atEndOfStream())
{
draw();
}
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
layoutGroupCurrent.Pop();
layoutGroupCurrent.Peek().Add(lg);
accept(TokenType.CLOSE_PAREN);
break;
case TokenType.OP_SQRT:
accept(TokenType.OP_SQRT);
accept(TokenType.OPEN_RADICAL);
lg = new LayoutGroup(LayoutGroupType.REL_POS_RIGHT);
lg.setWrapperRadical();
layoutGroupCurrent.Push(lg);
while (lookahead() != TokenType.CLOSE_RADICAL && !atEndOfStream())
{
draw();
}
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
//this.centrelineYs.Pop();
accept(TokenType.CLOSE_RADICAL);
layoutGroupCurrent.Pop();
layoutGroupCurrent.Peek().Add(lg);
break;
/*
* Drawing fractions by having equidistant 'lines',
* We draw numbers between the lines and the fraction lines ON the lines.
*
* We do this by 2 principles:
* Fractions on the same level should have their centre lines drawn at the same y-value.
* Fractions which may overlap with above or below lines should create space by pushing them up.
*
*/
case TokenType.OPEN_FRAC_UP:
//Debugger.Log(0, "[draw]", String.Format("OPEN_FRAC_UP"));
// Opening a fraction:
accept(TokenType.OPEN_FRAC_UP);
lg = new LayoutGroup(LayoutGroupType.REL_POS_FRACTION);
layoutGroupCurrent.Push(lg);
lg = new LayoutGroup(LayoutGroupType.REL_POS_FRACTION_NUMERATOR);
layoutGroupCurrent.Push(lg);
// Draw Numerator
while (lookahead() != TokenType.CLOSE_FRAC_UP && !atEndOfStream())
{
draw();
}
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
accept(TokenType.CLOSE_FRAC_UP);
accept(TokenType.OPEN_FRAC_DOWN);
lg = new LayoutGroup(LayoutGroupType.REL_POS_FRACTION_DENOMINATOR);
layoutGroupCurrent.Push(lg);
// Draw Denominator
while (lookahead() != TokenType.CLOSE_FRAC_DOWN && !atEndOfStream())
{
draw();
}
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
accept(TokenType.CLOSE_FRAC_DOWN);
// Pop Denominator
LayoutGroup denom = layoutGroupCurrent.Pop();
LayoutGroup num = layoutGroupCurrent.Pop();
LayoutGroup frac = layoutGroupCurrent.Pop();
frac.Add(num);
frac.Add(denom);
layoutGroupCurrent.Peek().Add(frac);
break;
case TokenType.OPEN_SUPER:
accept(TokenType.OPEN_SUPER);
lg = new LayoutGroup(LayoutGroupType.REL_POS_SUPER);
layoutGroupCurrent.Push(lg);
while (lookahead() != TokenType.CLOSE_SUPER && !atEndOfStream())
{
draw();
}
if (getCurrentToken() == this.currentDrawToken)
{
DrawCaret();
}
accept(TokenType.CLOSE_SUPER);
lg = layoutGroupCurrent.Pop();
layoutGroupCurrent.Peek().Add(lg);
break;
case TokenType.PLACEHOLDER:
double h = this.fontSizes.Peek();
AddRectangle(10, h);
accept(TokenType.PLACEHOLDER);
break;
default:
AddTextBox(lexRepr(), fontSizes.Peek());
accept(lookahead());
break;
}
}