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<title>Chapter 8 Example 19 - A* With Tank Animation with diagoinal moves</title>

window.addEventListener('load', eventWindowLoaded, false);

function eventWindowLoaded() {

canvasApp();

}

function canvasSupport () {

return Modernizr.canvas;

}

function canvasApp(){

if (!canvasSupport()) {

return;

}else{

var theCanvas = document.getElementById('canvas');

var context = theCanvas.getContext('2d');

}

var currentNodeIndex=0;

var nextNode;

var currentNode;

var rowDelta=0;

var colDelta=0;

var tankX=0;

var tankY=0;

var angleInRadians=0;

var tankStarted=false;

var tankMoving=false;

var finishedPath=false;

//set up tile map

var mapRows=15;

var mapCols=15;

var tileMap=[

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

,[0,1,2,1,1,1,1,1,1,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

,[0,2,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,0,0,1,0,0,0,1,0,0,0,1,0]

,[0,1,1,1,2,1,0,0,0,1,1,1,1,1,0]

,[0,0,0,0,0,1,1,1,1,1,0,0,0,0,0]

,[0,1,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

Simple A* Path Finding on a Tile Grid | 519

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,[0,1,0,1,0,0,2,0,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,1,1,1,1,1,2,1,1,1,1,1,1,0]

,[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

];

//set up a* graph

var graph = new Graph(tileMap);

var startNode={x:4,y:1}; // use values of map turned on side

var endNode={x:13,y:10};

//create node list

var start = graph.nodes[startNode.x][startNode.y];

var end = graph.nodes[endNode.x][endNode.y];

var result = astar.search(graph.nodes, start, end, true);

console.log("result", result);

//load in tile sheet image

var tileSheet=new Image();

tileSheet.addEventListener('load', eventSheetLoaded , false);

tileSheet.src="tiles.png";

const FRAME_RATE=40;

var intervalTime=1000/FRAME_RATE;

function eventSheetLoaded() {

gameLoop();

}

function gameLoop() {

drawScreen()

window.setTimeout(gameLoop, intervalTime);

}

function drawScreen() {

for (var rowCtr=0;rowCtr<mapRows;rowCtr++) {

for (var colCtr=0;colCtr<mapCols;colCtr++){

var tileId=tileMap[rowCtr][colCtr];

var sourceX=Math.floor(tileId % 5) *32;

var sourceY=Math.floor(tileId / 5) *32;

context.drawImage(tileSheet, sourceX, sourceY,32,32,

colCtr*32,rowCtr*32,32,32);

}

//draw green circle at start node

context.beginPath();

context.strokeStyle="green";

context.lineWidth=5;

context.arc((startNode.y*32)+16, (startNode.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

520 | Chapter 8: Canvas Games: Part I

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context.closePath();

//draw red circle at end node

context.beginPath();

context.strokeStyle="red";

context.lineWidth=5;

context.arc((endNode.y*32)+16, (endNode.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

context.closePath();

//draw black circles on path

for (var ctr=0;ctr<result.length-1;ctr++) {

var node=result[ctr];

context.beginPath();

context.strokeStyle="black";

context.lineWidth=5;

context.arc((node.y*32)+16, (node.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

context.closePath();

}

if (!finishedPath) {

if (!tankStarted) {

currentNode=startNode;

tankStarted=true;

nextNode=result[0];

tankX=currentNode.x*32;

tankY=currentNode.y*32

}

if (tankX==nextNode.x*32 && tankY==nextNode.y*32) {

//node change

currentNodeIndex++;

if (currentNodeIndex == result.length) {

finishedPath=true;

}

currentNode=nextNode;

nextNode=result[currentNodeIndex]

tankMoving=false;

}

if (!finishedPath) {

if (nextNode.x > currentNode.x) {

colDelta=1;

}else if (nextNode.x < currentNode.x) {

colDelta=-1

}else{

colDelta=0

}

Simple A* Path Finding on a Tile Grid | 521

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if (nextNode.y > currentNode.y) {

rowDelta=1;

}else if (nextNode.y < currentNode.y) {

rowDelta=-1

}else{

rowDelta=0

}

angleInRadians=Math.atan2(colDelta,rowDelta);

tankMoving=true;

}

tankX+=colDelta;

tankY+=rowDelta;

}

var tankSourceX=Math.floor(3 % 5) *32;

var tankSourceY=Math.floor(3 / 5) *32;

context.save(); //save current state in stack

context.setTransform(1,0,0,1,0,0); // reset to identity

context.translate((tankY)+16,(tankX)+16);

context.rotate(angleInRadians);

context.drawImage(tileSheet, tankSourceX, tankSourceY,

32,32,-16,-16,32,32);

context.restore();

}

</script>

</head>

<body>

Your browser does not support the HTML 5 Canvas.

</canvas>

</div>

</body>

</html>

Figure 8-19 demonstrates Example 8-19. The poorly designed tile map with diagonal

node paths turned on results in a path where the tank can move through the walls. In

the next example, we will fix this problem with a new tile map.

522 | Chapter 8: Canvas Games: Part I

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Figure 8-19. A* tank moving through path with diagonal and possible pass through

In Example 8-20, we will modify the maze to add an extra block at the intersection where

the tank passed through the walls with a diagonal path. Here is the new tile map for

Example 8-20:

var mapCols=15;

var tileMap=[

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

,[0,1,2,1,1,1,1,1,1,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

,[0,2,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,0,0,1,0,0,0,1,0,0,0,1,0]

,[0,1,1,1,2,1,0,0,0,1,1,1,1,1,0]

,[0,0,0,0,0,1,1,1,1,1,0,0,0,0,0]

,[0,1,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,2,0,0,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,1,1,1,1,1,2,1,1,1,1,1,1,0]

,[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

];

Simple A* Path Finding on a Tile Grid | 523

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Figure 8-20 shows how the new tile map will affect the node path with diagonal move‐

ment applied. The new tiles will block the diagonal path through the seemingly impass‐

able walls and create real impassable diagonal walls.

Figure 8-20. A* tank moving through the maze, with added walls to create impassible

diagonal barriers

Example 8-20. New maze design with impassable walls

<!doctype html>

<head>

<title>Chapter 8 Example 20 - A* With Tank Animation with new maze to prevent

passable walls </title>

window.addEventListener('load', eventWindowLoaded, false);

function eventWindowLoaded() {

canvasApp();

}

524 | Chapter 8: Canvas Games: Part I

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function canvasSupport () {

return Modernizr.canvas;

}

function canvasApp(){

if (!canvasSupport()) {

return;

}else{

var theCanvas = document.getElementById('canvas');

var context = theCanvas.getContext('2d');

}

var currentNodeIndex=0;

var nextNode;

var currentNode;

var rowDelta=0;

var colDelta=0;

var tankX=0;

var tankY=0;

var angleInRadians=0;

var tankStarted=false;

var tankMoving=false;

var finishedPath=false;

//set up tile map

var mapRows=15;

var mapCols=15;

var tileMap=[

[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

,[0,1,2,1,1,1,1,1,1,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

,[0,2,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,0,0,1,0,0,0,1,0,0,0,1,0]

,[0,1,1,1,2,1,0,0,0,1,1,1,1,1,0]

,[0,0,0,0,0,1,1,1,1,1,0,0,0,0,0]

,[0,1,1,1,1,1,0,0,0,1,1,1,1,1,0]

,[0,1,0,1,0,0,1,1,1,0,0,1,0,1,0]

,[0,1,0,1,0,0,2,0,0,0,0,1,0,1,0]

,[0,1,0,1,0,0,1,0,1,0,0,1,0,1,0]

,[0,1,1,1,1,1,1,2,1,1,1,1,1,1,0]

,[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

];

//set up a* graph

var graph = new Graph(tileMap);

var startNode={x:4,y:1}; // use values of map turned on side

var endNode={x:13,y:10};

//create node list

var start = graph.nodes[startNode.x][startNode.y];

Simple A* Path Finding on a Tile Grid | 525

var end = graph.nodes[endNode.x][endNode.y];

var result = astar.search(graph.nodes, start, end, true);

console.log("result", result);

//load in tile sheet image

var tileSheet=new Image();

tileSheet.addEventListener('load', eventSheetLoaded , false);

tileSheet.src="tiles.png";

const FRAME_RATE=40;

var intervalTime=1000/FRAME_RATE;

function eventSheetLoaded() {

gameLoop();

}

function gameLoop() {

drawScreen()

window.setTimeout(gameLoop, intervalTime);

}

function drawScreen() {

for (var rowCtr=0;rowCtr<mapRows;rowCtr++) {

for (var colCtr=0;colCtr<mapCols;colCtr++){

var tileId=tileMap[rowCtr][colCtr];

var sourceX=Math.floor(tileId % 5) *32;

var sourceY=Math.floor(tileId / 5) *32;

context.drawImage(tileSheet, sourceX, sourceY,32,32,

colCtr*32,rowCtr*32,32,32);

}

//draw green circle at start node

context.beginPath();

context.strokeStyle="green";

context.lineWidth=5;

context.arc((startNode.y*32)+16, (startNode.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

context.closePath();

//draw red circle at end node

context.beginPath();

context.strokeStyle="red";

context.lineWidth=5;

context.arc((endNode.y*32)+16, (endNode.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

context.closePath();

//draw black circles on path

for (var ctr=0;ctr<result.length-1;ctr++) {

526 | Chapter 8: Canvas Games: Part I

var node=result[ctr];

context.beginPath();

context.strokeStyle="black";

context.lineWidth=5;

context.arc((node.y*32)+16, (node.x*32)+16, 10, 0,

(Math.PI/180)*360,false);

context.stroke();

context.closePath();

}

if (!finishedPath) {

if (!tankStarted) {

currentNode=startNode;

tankStarted=true;

nextNode=result[0];

tankX=currentNode.x*32;

tankY=currentNode.y*32

}

if (tankX==nextNode.x*32 && tankY==nextNode.y*32) {

//node change

currentNodeIndex++;

if (currentNodeIndex == result.length) {

finishedPath=true;

}

currentNode=nextNode;

nextNode=result[currentNodeIndex]

tankMoving=false;

}

if (!finishedPath) {

if (nextNode.x > currentNode.x) {

colDelta=1;

}else if (nextNode.x < currentNode.x) {

colDelta=-1

}else{

colDelta=0

}

if (nextNode.y > currentNode.y) {

rowDelta=1;

}else if (nextNode.y < currentNode.y) {

rowDelta=-1

}else{

rowDelta=0

}

angleInRadians=Math.atan2(colDelta,rowDelta);

tankMoving=true;

}

Simple A* Path Finding on a Tile Grid | 527

tankX+=colDelta;

tankY+=rowDelta;

}

var tankSourceX=Math.floor(3 % 5) *32;

var tankSourceY=Math.floor(3 / 5) *32;

context.save(); //save current state in stack

context.setTransform(1,0,0,1,0,0); // reset to identity

context.translate((tankY)+16,(tankX)+16);

context.rotate(angleInRadians);

context.drawImage(tileSheet, tankSourceX, tankSourceY,

32,32,-16,-16,32,32);

context.restore();

}

</script>

</head>

<body>

Your browser does not support the HTML5 Canvas.

</canvas>

</div>

</body>

</html>

We have now covered some basic, intermediate, and more advanced topics on A* path

finding. These are easy to apply to any tile-based application where you need to find the

shortest path between two points.

What’s Next?

We covered quite a bit in this chapter. HTML5 Canvas might lack some of the more

refined features common to web game development platforms such as Flash, but it

contains powerful tools for manipulating the screen in immediate mode. These features

allow us to create a game application with many individual logical display objects—even

though each canvas can support only a single physical display object (the canvas itself).

We also covered a more advanced topic of tile-based path finding on a 2D map using

the A* algorithm.

In Chapter 9, we will explore some more advanced game topics, such as replacing paths

with bitmap images, creating object pools, and adding a sound manager. We’ll extend

the game we built in this chapter and create a new turn-based strategy game, and we’ll

cover scrolling a tile-based game screen.

528 | Chapter 8: Canvas Games: Part I

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