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////////////////////////////////////////////////////////

//

// Simple transformation of 2D triangles

// Notice TRIANGLE_FAN is used to draw

//

// Han-Wei Shen (shen.94@osu.edu)

//

var gl;

var shaderProgram;

var draw_type=2;

//////////// Init OpenGL Context etc. ///////////////

function initGL(canvas) {

try {

gl = canvas.getContext("experimental-webgl");

gl.viewportWidth = canvas.width;

gl.viewportHeight = canvas.height;

} catch (e) {

}

if (!gl) {

alert("Could not initialise WebGL, sorry :-(");

}

}

///////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////

var squareVertexPositionBuffer;

var AxesVertexPositionBuffer;

//////////////// Initialize VBO ////////////////////////

function initSquareBuffers() {

squareVertexPositionBuffer = gl.createBuffer();

gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);

var vertices = [

0.5, 0.5, 0.0,

-0.5, 0.5, 0.0,

-0.5, -0.5, 0.0,

0.5, -0.5, 0.0,

];

gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);

squareVertexPositionBuffer.vertexSize = 3;

squareVertexPositionBuffer.numVertices = 4;

}

function initAxesBuffers() {

AxesVertexPositionBuffer = gl.createBuffer();

gl.bindBuffer(gl.ARRAY_BUFFER, AxesVertexPositionBuffer);

var vertices = [

0.0, 0.0, 0.0,

0.0, 1.0, 0.0,

0.0, 0.0, 0.0,

1.0, 0.0, 0.0,

];

gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);

AxesVertexPositionBuffer.vertexSize = 3;

AxesVertexPositionBuffer.numVertices = 4;

}

///////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////

var mvMatrix = mat4.create();

var Z_angle = 0.0;

var z_angle = 0.0;

var y_trans = 0.0;

function degToRad(degrees) {

return degrees * Math.PI / 180;

}

//////////////////////////////////////////////////////////////

function drawbox(mvMatrix, color){

var offset = 0;

var stride = 0;

gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);

gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.vertexSize, gl.FLOAT, false, stride, offset);

gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);

gl.uniform4fv(shaderProgram.uColor, color);

if (draw_type==2) gl.drawArrays(gl.TRIANGLE_FAN, 0, squareVertexPositionBuffer.numVertices);

else if (draw_type ==1) gl.drawArrays(gl.LINE_LOOP, 0, squareVertexPositionBuffer.numVertices);

else if (draw_type ==0) gl.drawArrays(gl.POINTS, 0, squareVertexPositionBuffer.numVertices);

}

function drawAxes(mvMatrix){

var offset = 0;

var stride = 0;

gl.bindBuffer(gl.ARRAY_BUFFER, AxesVertexPositionBuffer);

gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.vertexSize, gl.FLOAT, false, stride, offset);

gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);

var color = [0,0,1.0, 1.0];

gl.uniform4fv(shaderProgram.uColor, color);

gl.drawArrays(gl.LINES, 0, 2); // y axis

var color = [1,0,0.0, 1.0];

gl.uniform4fv(shaderProgram.uColor, color);

gl.drawArrays(gl.LINES, 2, 2); // y axis

}

///////////////////////////////////////////////////////////////

function drawScene() {

gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);

gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

var color = [1.0, 1.0, 1.0, 1.0];

// draw a original first

mat4.identity(mvMatrix);

mvMatrix = mat4.translate(mvMatrix, [0, 0, 0]);

mvMatrix = mat4.scale(mvMatrix, [0.1, 0.1, 0.2]);

color = [1.0, 0, 0.0, 1.0];

drawbox(mvMatrix, color);

drawAxes(mvMatrix);

// now draw a little box

mat4.identity(mvMatrix);

mvMatrix = mat4.rotate(mvMatrix, degToRad(Z_angle), [0,0,1]);

mvMatrix = mat4.translate(mvMatrix, [-0.5, 0, 0]);

mvMatrix = mat4.rotate(mvMatrix, degToRad(z_angle), [0, 0, 1]);

mvMatrix = mat4.scale(mvMatrix, [0.2, 0.2, 0.2]);

color = [1.0, 1.0, 0.0, 1.0];

drawbox(mvMatrix, color);

drawAxes(mvMatrix);

}

///////////////////////////////////////////////////////////////

var lastMouseX = 0, lastMouseY = 0;

///////////////////////////////////////////////////////////////

function onDocumentMouseDown( event ) {

event.preventDefault();

document.addEventListener( 'mousemove', onDocumentMouseMove, false );

document.addEventListener( 'mouseup', onDocumentMouseUp, false );

document.addEventListener( 'mouseout', onDocumentMouseOut, false );

var mouseX = event.clientX;

var mouseY = event.clientY;

lastMouseX = mouseX;

lastMouseY = mouseY;

}

function onDocumentMouseMove( event ) {

var mouseX = event.clientX;

var mouseY = event.ClientY;

var diffX = mouseX - lastMouseX;

var diffY = mouseY - lastMouseY;

Z_angle = Z_angle + diffX/5;

lastMouseX = mouseX;

lastMouseY = mouseY;

drawScene();

}

function onDocumentMouseUp( event ) {

document.removeEventListener( 'mousemove', onDocumentMouseMove, false );

document.removeEventListener( 'mouseup', onDocumentMouseUp, false );

document.removeEventListener( 'mouseout', onDocumentMouseOut, false );

}

function onDocumentMouseOut( event ) {

document.removeEventListener( 'mousemove', onDocumentMouseMove, false );

document.removeEventListener( 'mouseup', onDocumentMouseUp, false );

document.removeEventListener( 'mouseout', onDocumentMouseOut, false );

}

///////////////////////////////////////////////////////////////

function webGLStart() {

var canvas = document.getElementById("code03-canvas");

initGL(canvas);

initShaders();

shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");

gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);

shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");

shaderProgram.uColor = gl.getUniformLocation(shaderProgram, "uColor");

initSquareBuffers();

initAxesBuffers();

gl.clearColor(0.0, 0.0, 0.0, 1.0);

document.addEventListener('mousedown', onDocumentMouseDown,

false);

document.addEventListener('keydown', onKeyDown, false);

drawScene();

}

function BG(red, green, blue) {

gl.clearColor(red, green, blue, 1.0);

drawScene();

}

function redraw() {

Z_angle = 0;

drawScene();

}

function geometry(type) {

draw_type = type;

drawScene();

}

var delta = 0.2;

///////////////////////////////////////////////////////////////////////////

//

// key stroke handler

//

function onKeyDown(event) {

console.log(event.keyCode);

switch(event.keyCode) {

case 82:

if (event.shiftKey) {

console.log('enter R');

Z_angle +=6;

z_angle +=10;

if (y_trans < 1.0 && y_trans+delta >= 1.0) delta = -1 * delta;

else if (y_trans > -1.0 && y_trans+delta <= -1.0 ) delta = -1 * delta;

y_trans += delta;

console.log("yyyyyy", y_trans, "dddd", delta);

}

else {

console.log('enter r');

z_angle -=10;

}

break;

}

drawScene(); // draw the VBO

}