MinaGabriel/random_transposition.html

## random_transposition.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8"/>
    <title>Translate a Triangle</title>

<body onload="main()">
<canvas id="webgl" width="400" height="400">
    Please use a browser that supports "canvas"
</canvas>
</body>

<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/webgl-utils.js"></script>
<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/webgl-debug.js"></script>
<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/cuon-utils.js"></script>
<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/cuon-matrix.js"></script>
<script type="text/javascript">

    // MultiPoint.js (c) 2012 matsuda
    // Vertex shader program
    var VSHADER_SOURCE =
        'attribute vec4 a_Position;\n' +
        'uniform mat4 u_ModelMatrix;\n' +
        'void main() {\n' +
        '  gl_Position = u_ModelMatrix * a_Position;\n' +
        '  gl_PointSize = 10.0;\n' +
        '}\n';

    // Fragment shader program
    var FSHADER_SOURCE =
        'void main() {\n' +
        '  gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n' +
        '}\n';

    function main() {
        // Retrieve <canvas> element
        var canvas = document.getElementById('webgl');

        // Get the rendering context for WebGL
        var gl = getWebGLContext(canvas);
        if (!gl) {
            console.log('Failed to get the rendering context for WebGL');
            return;
        }

        // Initialize shaders
        if (!initShaders(gl, VSHADER_SOURCE, FSHADER_SOURCE)) {
            console.log('Failed to intialize shaders.');
            return;
        }

        // Write the positions of vertices to a vertex shader
        var n = initVertexBuffers(gl);
        if (n < 0) {
            console.log('Failed to set the positions of the vertices');
            return;
        }

        // Specify the color for clearing <canvas>
        gl.clearColor(0.0, 0.0, 0.0, 1.0);

        var u_ModelMatrix = gl.getUniformLocation(gl.program, 'u_ModelMatrix');
        if (!u_ModelMatrix) {
            console.log('Failed to get the storage location of u_ModelMatrix');
            return;
        }

        var modelMatrix = new Matrix4();

        var x = 0.0, y = 0.0
        var x_t = 0.005, y_t = 0.005, x_new= 0.0, y_new = 0.0

        var tick = function () {

            modelMatrix.translate(x_t, y_t, 0);
            // This is important to init the canvas color
            gl.clear(gl.COLOR_BUFFER_BIT);

            gl.uniformMatrix4fv(u_ModelMatrix, false, modelMatrix.elements);
            gl.drawArrays(gl.POINTS, 0, n);
            //where x should go

            x_new = x + get_random();
            y_new = y + get_random();

            if(x_new >= 0.9){
                x_new = x_new  - 0.1
            }else if (x_new <= -0.9 ){
                x_new = x_new  + 0.1
            }else if (y_new >= 0.9){
                y_new = y_new  - 0.9
            }else if (y_new <= -0.9){
                y_new = y_new + 0.1
            }

            x_t = x_new - x
            y_t = y_new - y

            x = x_new
            y = y_new
            requestAnimationFrame(tick, canvas)

        };
        tick();


    }

    function get_random(){
        const options = [-0.1, 0, 0.1];
        return options[Math.floor(Math.random() * (3))];

    }

    function initVertexBuffers(gl) {
        var vertices = new Float32Array([
            0.0, 0.0
        ]);
        var n = 1; // The number of vertices

        // Create a buffer object
        var vertexBuffer = gl.createBuffer();
        if (!vertexBuffer) {
            console.log('Failed to create the buffer object');
            return -1;
        }

        // Bind the buffer object to target
        gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
        // Write date into the buffer object
        gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);

        var a_Position = gl.getAttribLocation(gl.program, 'a_Position');
        if (a_Position < 0) {
            console.log('Failed to get the storage location of a_Position');
            return -1;
        }
        // Assign the buffer object to a_Position variable
        gl.vertexAttribPointer(a_Position, 2, gl.FLOAT, false, 0, 0);

        // Enable the assignment to a_Position variable
        gl.enableVertexAttribArray(a_Position);

        return n;
    }


</script>
</head>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8"/>
	<title>Translate a Triangle</title>

	<body onload="main()">
	<canvas id="webgl" width="400" height="400">
	Please use a browser that supports "canvas"
	</canvas>
	</body>

	<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/webgl-utils.js"></script>
	<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/webgl-debug.js"></script>
	<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/cuon-utils.js"></script>
	<script src="https://rawgit.com/huningxin/webglbook_examples/master/lib/cuon-matrix.js"></script>
	<script type="text/javascript">

	// MultiPoint.js (c) 2012 matsuda
	// Vertex shader program
	var VSHADER_SOURCE =
	'attribute vec4 a_Position;\n' +
	'uniform mat4 u_ModelMatrix;\n' +
	'void main() {\n' +
	' gl_Position = u_ModelMatrix * a_Position;\n' +
	' gl_PointSize = 10.0;\n' +
	'}\n';

	// Fragment shader program
	var FSHADER_SOURCE =
	'void main() {\n' +
	' gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n' +
	'}\n';

	function main() {
	// Retrieve <canvas> element
	var canvas = document.getElementById('webgl');

	// Get the rendering context for WebGL
	var gl = getWebGLContext(canvas);
	if (!gl) {
	console.log('Failed to get the rendering context for WebGL');
	return;
	}

	// Initialize shaders
	if (!initShaders(gl, VSHADER_SOURCE, FSHADER_SOURCE)) {
	console.log('Failed to intialize shaders.');
	return;
	}

	// Write the positions of vertices to a vertex shader
	var n = initVertexBuffers(gl);
	if (n < 0) {
	console.log('Failed to set the positions of the vertices');
	return;
	}

	// Specify the color for clearing <canvas>
	gl.clearColor(0.0, 0.0, 0.0, 1.0);

	var u_ModelMatrix = gl.getUniformLocation(gl.program, 'u_ModelMatrix');
	if (!u_ModelMatrix) {
	console.log('Failed to get the storage location of u_ModelMatrix');
	return;
	}

	var modelMatrix = new Matrix4();

	var x = 0.0, y = 0.0
	var x_t = 0.005, y_t = 0.005, x_new= 0.0, y_new = 0.0

	var tick = function () {

	modelMatrix.translate(x_t, y_t, 0);
	// This is important to init the canvas color
	gl.clear(gl.COLOR_BUFFER_BIT);

	gl.uniformMatrix4fv(u_ModelMatrix, false, modelMatrix.elements);
	gl.drawArrays(gl.POINTS, 0, n);
	//where x should go

	x_new = x + get_random();
	y_new = y + get_random();

	if(x_new >= 0.9){
	x_new = x_new - 0.1
	}else if (x_new <= -0.9 ){
	x_new = x_new + 0.1
	}else if (y_new >= 0.9){
	y_new = y_new - 0.9
	}else if (y_new <= -0.9){
	y_new = y_new + 0.1
	}

	x_t = x_new - x
	y_t = y_new - y

	x = x_new
	y = y_new
	requestAnimationFrame(tick, canvas)

	};
	tick();


	}

	function get_random(){
	const options = [-0.1, 0, 0.1];
	return options[Math.floor(Math.random() * (3))];

	}

	function initVertexBuffers(gl) {
	var vertices = new Float32Array([
	0.0, 0.0
	]);
	var n = 1; // The number of vertices

	// Create a buffer object
	var vertexBuffer = gl.createBuffer();
	if (!vertexBuffer) {
	console.log('Failed to create the buffer object');
	return -1;
	}

	// Bind the buffer object to target
	gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
	// Write date into the buffer object
	gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);

	var a_Position = gl.getAttribLocation(gl.program, 'a_Position');
	if (a_Position < 0) {
	console.log('Failed to get the storage location of a_Position');
	return -1;
	}
	// Assign the buffer object to a_Position variable
	gl.vertexAttribPointer(a_Position, 2, gl.FLOAT, false, 0, 0);

	// Enable the assignment to a_Position variable
	gl.enableVertexAttribArray(a_Position);

	return n;
	}


	</script>
	</head>
	</html>