smash/indexa.html at master · fab9/smash · GitHub

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<doctype html>
  <head>
<title>Displaying an image with canvas</title>
</head>
<canvas width="319" height="160"></canvas>
<script >
// get a reference to the canvas
var canvas = document.querySelector("canvas");
// get a reference to the canvas's drawing surface
var drawingSurface = canvas.getContext("2d");
// create a monsterImage variable to hold the new image
var monsterImage = new Image();
// Add a listener to the image to call the render
// function when the image has loaded
monsterImage.addEventListener("load", loadHandler, false);
// Assign the image's src property to the image you want to load
monsterImage.src = "img/monsterStates.png";
function imageLoadHandler()
{
  // Draw the monsterImage onto the drawingSurface
  drawingSurface.drawImage(monsterImage, 0, 0);
}

// Before you can display anything in the canvas you have
// you have to access this surface with JavaScript

// Get a reference to the canvas HTML tag
var canvas = document.querySelector("canvas");

// Access the canvas's drawing surface
var drawingSurface = canvas.getContext("2d");

// drawing surface (blank piece of paper) is the same size as the canvas


// Create a new image object
var monsterImage = new Image(); // newImage is a built-in feature of JavaScript that creates a blank, invisible <img> tag directly on your program

// add a load event listener to the image. When it's finished loading, it will call the loadHandler
monsterImage.addEventListener("load", loadHandler, false);

monsterImage.src = "img/monsterStates.png";

// Call loadHandler when image is finished loading
function loadHandler()
{
  drawingSurface.drawImage
  (
    monsterImage,
    159, 0, 159, 159,
    0, 0, 159, 159
  );
}

// obj with 2 states
var monster =
{
  //Define the monster's states

  NORMAL: 0,
  SCARED: 1,

  //Set its initial state

  state: 0
};

//Change the monster's state by pressing a key

window.addEventListener("keydown", keydownHandler, false);

function keydownHandler(event)
{
  //Change the monster's state
  monster.state = monster.SCARED;

  //Display the new state
  console.log("The monster's new state: " + monster.state);
}

</script>