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The DHTML Lab Jigsaw Puzzle, Part IV: Cross-Browser
solving and setting the grid

Our random number generator, that creates x-y coordinates for piece positioning, remains exactly the same:

function getRandNums(from,to){
    temp = parseInt((Math.random() * (to-from)) + (from));
    while (isNaN(temp)) {
        temp = parseInt((Math.random() * (to - from)) + (from))
    }
    return temp
}

Setting the Grid

Our setGrid() function is, again, a combination of the browser-specific codes, with no new statements.

function setGrid() {
    gridWidth = (9/puzzAcross) * puzzWidth;
    gridHeight = (9/puzzDown) * puzzHeight;

    if (IE4) {
        elImGrid.style.width = gridWidth;
        elImGrid.style.height = gridHeight;
        elGrid.style.clip = "rect(0 " + puzzWidth + sp + puzzHeight + " 0)";
    }
    else {
        elGrid.document.write("<IMG NAME='imGrid' SRC='grid.gif' WIDTH=" + gridWidth + " HEIGHT=" + gridHeight + ">");
        elGrid.document.close();
        elGrid.clip.right = puzzWidth;
        elGrid.clip.bottom = puzzHeight;
    }

    gridBut.value = "Grid ON";

    if (isBroken) { elGrid.showIt(true) }
}

Solving

Recall that in our HTML, we changed the function called by the Solve and Hint buttons to preSolve(), to avoid the double auto-solve problem. preSolve() filters any solve calls, disallowing solves, if:

• the puzzle is already being auto-solved, or
• the puzzle is not broken, or
• a new puzzle is called for

function preSolve(isFullSolve) {
    if (isSolving || !isBroken || isNewPuzz) { return };
    solve(isFullSolve);    
}

If a solve should be allowed, preSolve() calls our old solve function.

solve() is a simple a combination of the two browser codes, with one important addition. If a full auto-solve is called for, that is, if isFullSolve is true, isSolving is set to true, allowing filtering of any further user presses of Solve:

function solve(isFullSolve) {
    if (pieceToSolve > puzzPieces) { pieceToSolve = 1; return }

    isSolving = (isFullSolve) ? 1 : 0;

    tempEl = eval("PIECE" + pieceToSolve);
    if (tempEl.draggable){
        if (tempEl != activeEl ) {
            if (IE4) {tempEl.style.zIndex = activeEl.style.zIndex + 1}
                else {tempEl.moveAbove(activeEl)}
            activeEl = tempEl;
        }
        flashTimer = setInterval("visToggle(" + isFullSolve + ")",100);
    }
    else { pieceToSolve++; solve(isFullSolve) };
}

Finally, let's look at the remaining miscellaneous functions of our main script.

Produced by Peter Belesis and

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Created: Dec. 17, 1997
Revised: Jan. 18, 1998

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