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POTrying to create tetris, but can't
 

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  1. POTrying to create tetris, but can't
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    <p>For some reason my code refuses to let me assign an x and y position to each block. Each block is 30 pixels wide and tall and will be colored according to which piece it is a part of. Gravity and a clear function haven't been implemented and the move left and move right function are so different because it wasn't working right and then recreated it as it is seen now in the left function and it works less...</p> <p>Please help!</p> <p>Edit: My apologies, i dont normally post anything. The part i cant get past now is function block/add block/typeSet/assigning the type. it assigns a random one pretty well but then when that type (such as square) goes to assign x and y values it gives an error.</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Tetris in Canvas&lt;/title&gt; &lt;style type="text/css"&gt; canvas { border: solid 1px black; margin: -8px; } &lt;/style&gt; &lt;script type="text/javascript"&gt; var canvas = null; var ctx = null; var blockArray = []; var board = []; var blockNum = 0; for (var s = 0; s &lt; 14; s++) { board[s] = [27]; for (var t = 0; t &lt; 27; t++) { board[s][t] = -1; } } document.onkeydown = function(event) { var keyCode; if(event == null) keyCode = window.event.keyCode; else keyCode = event.keyCode; switch(keyCode) { case 37: left(blockArray.length); break; case 38: up(blockArray.length); break; case 39: right(blockArray.length); break; case 40: down(blockArray.length); break; default: break; } } window.onload = function init() { canvas = document.getElementById('Canvas1'); ctx = canvas.getContext("2d"); blank(); addBlock(); animate(); } function up(i) { blank(); animate(); } function down(i) { var u = 0; var p = 0; while(u&lt;4) { if (blockArray[i].y[u] + 1 &gt; 26) { u = 10; } else if ((board[blockArray[i].x[u]][blockArray[i].y[u] + 1]) == -1) { u++; } else { p = u; for (var g = 0; ((g &lt; 4) &amp;&amp; (p = u)); g++) { if ((blockArray[i].x[u] == blockArray[i].x[g]) &amp;&amp; (blockArray[i].y[u] + 1 == blockArray[i].y[g])) { u++; } } if (p == u) u = 10; } } if (u &lt; 10) { for (var j=0; j&lt;4; j++) { blockArray[i].y[j] +=1; } } else addBlock(); animate(); } function right(i) { var u = 0; var p = 0; while(u&lt;4) { if (blockArray[i].x[u] + 1 &gt; 13) { u = 10; } else if ((board[blockArray[i].x[u] + 1][blockArray[i].y[u]]) == -1) u++; else { p = u; for (var g = 0; ((g &lt; 4) &amp;&amp; (p = u)); g++) { if ((blockArray[i].x[u] + 1 == blockArray[i].x[g]) &amp;&amp; (blockArray[i].y[u] == blockArray[i].y[g])) u++; } if (p == u) u = 10; } } if (u &lt; 10) { for (var j=0; j&lt;4; j++) { blockArray[i].x[j] +=1; } } else addBlock(); animate(); } function left(i) { var u; var p = 14; for (var w = 0; w&lt;4; w++) { if (blockArray[i].x[w] &lt; p) { p = blockArray[i].x[w]; u = w; } } if (p &gt; 0) { if ((board[blockArray[i].x[u] - 1][blockArray[i].y[u]]) == -1) { for (var j=0; j&lt;4; j++) { blockArray[i].x[j] -=1; } } } animate(); } function block(x, y, type) { blockNum += 1; this.id = blockNum; this.x = []; this.y = []; this.landed = false; this.type = Math.floor(Math.random() * (6)) + 1; typeSet(this.type); } function addBlock() { blockArray[blockArray.length] = new block(); } function typeSet(type) { i = blockArray.length; switch (type) { case 1: square(i); break; case 2: elR(i); break; case 3: elL(i); break; case 4: line(i); break; case 5: zeR(i); break; case 6: zeL(i); break; default: break; } } function animate() { fillBoard(); colorBoard(); } function fillBoard() { for (var i = 0; i &lt; 14; i++) { for (var q = 0; q &lt; 27; q++) { board[i][q] = -1; } } for (var i=0; i&lt;blockArray.length; i++) { for (var q=0; q&lt;4; q++) { board[blockArray[i].x[q]][blockArray[i].y[q]] = blockArray[i].type; } } } function colorBoard() { blank(); ctx.strokeStyle = "white"; for(var q=0; q&lt;14; q++) { for(var r=0; r&lt;27; r++) { switch (board[q][r]) { case 1: ctx.fillStyle = "green"; color(q,r); break; case 2: ctx.fillStyle = "orange"; color(q,r); break; case 3: ctx.fillStyle = "cyan"; color(q,r); break; case 4: ctx.fillStyle = "black"; color(q,r); break; case 5: ctx.fillStyle = "yellow"; color(q,r); break; case 6: ctx.fillStyle = "brown"; color(q,r); break; default: break; } } } } function color(q,r) { ctx.fillRect(q*30,(r-4)*30,30,30); ctx.strokeRect(q*30,(r-4)*30,30,30); } function square(i) { blockArray[i].x[0] = 7; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 1; blockArray[i].x[2] = 8; blockArray[i].y[2] = 0; blockArray[i].x[3] = 8; blockArray[i].y[3] = 1; } function elR(i) { blockArray[i].x[0] = 7; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 1; blockArray[i].x[2] = 7; blockArray[i].y[2] = 2; blockArray[i].x[3] = 8; blockArray[i].y[3] = 2; } function elL(i) { blockArray[i].x[0] = 7; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 1; blockArray[i].x[2] = 7; blockArray[i].y[2] = 2; blockArray[i].x[3] = 6; blockArray[i].y[3] = 2; } function line(i) { blockArray[i].x[0] = 7; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 1; blockArray[i].x[2] = 7; blockArray[i].y[2] = 2; blockArray[i].x[3] = 7; blockArray[i].y[3] = 3; } function zeR(i) { blockArray[i].x[0] = 6; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 0; blockArray[i].x[2] = 7; blockArray[i].y[2] = 1; blockArray[i].x[3] = 8; blockArray[i].y[3] = 1; } function zeL(i) { blockArray[i].x[0] = 8; blockArray[i].y[0] = 0; blockArray[i].x[1] = 7; blockArray[i].y[1] = 0; blockArray[i].x[2] = 7; blockArray[i].y[2] = 1; blockArray[i].x[3] = 6; blockArray[i].y[3] = 1; } function blank() { ctx.restore(); ctx.fillStyle = "blue"; ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height); ctx.save(); } function blank2() { ctx.restore(); ctx.fillStyle = "purple"; ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height); ctx.save(); } function rotateImgRight() { for(d = 0; d &lt; 180; d++) { setTimeout(rotateImg, 50); } } function rotateImgLeft() { for(d = 0; d &lt; 180; d++) { setTimeout(rotateImg2, 50); } } function rotateImg2() { degrees = degrees - 0.5; radian = (Math.PI / 180.0) * degrees; blank(); ctx.translate(ctx.canvas.width/2, 700); ctx.rotate(radian); ctx.drawImage(srcImg, -srcImg.width/2,-srcImg.height/2); slide = (degrees / 90) % 4; } function rotateImg(x,y) { degrees = degrees + 0.5; radian = (Math.PI / 180.0) * degrees; ctx.translate(x,y); ctx.rotate(radian); ctx.drawImage(srcImg, -srcImg.width/2,-srcImg.height/2); slide = (degrees / 90) % 4; } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div style="width: 100%; text-align:center"&gt; &lt;canvas id="Canvas1" width="421" height="690"&gt;Your browser does not support canvas.&lt;/canvas&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. USTom Prats
    1. USTom Prats
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    2. VO
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    1. COYou should try rephrasing your question so we can help. What specific part is the problem? You can't expect any one of us to finish off the entire thing
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      1. USsoniiic
    2. CO@sonniiic: "my code refuses to let me assign an x and y position to each block"
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      1. USFMaz008
    3. COSo which part of your 358 line code sample is that?
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      1. USsoniiic
 

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