I'm facing an issue with the following code. When I position the brace in different places, I encounter errors like "var not defined" or "function not defined". My goal is to convert an array into a string so that I can analyze the data and decide how best to display it, possibly as a histogram. Below is the code snippet in question:
function drawImage(imageObj) {
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var imageX = 10;
var imageY = 10;
var imageWidth = imageObj.width;
var imageHeight = imageObj.height;
context.drawImage(imageObj, imageX, imageY);
var imageData = context.getImageData(imageX, imageY, imageWidth, imageHeight);
var data = imageData.data;
for (var i = 0, n = data.length; i < n; i += 4) {
var red = data[i];
var green = data[i + 1];
var blue = data[i + 2];
var alpha = data[i + 3];
}
} //this brace is causing issues
function myFunction() {
red.toString();
document.getElementById("test").innerHTML = red;
}
// what if I move the brace here as an alternative?
var imageObj = new Image();
imageObj.onload = function() {
drawImage(this);
};
imageObj.src = 'myimg.jpg';
Can anyone point out where I may have made a mistake?