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<html>
<script src='matrix_vector_lib.js' ></script>

<script>

//  TODO rotate selected points
//  TODO control with zoom rotate or pan means that action is only applied to the camera not the selected points.


//  TODO clicking and dragging on a line allows you to place a point somewhere on that line.  Perhaps with the modifier key it would break up the existing line into line segments.

//  TODO when lines are deleted, readd the solo points to the solo_points list
//  

//  TODO z for undo shift + z for redo.
//
//  TODO 
//

//  TODO drop down minimalist menu in top right of canvas.


//  drag to connect points

//
//
//  Global variables
//
//  use longer more descriptive names, especially for obscure variables, to avoid conflict in the global space,
//  even if certain properties are factored into objects, if it is a large object, they work similar to globals in that exist in a large namespace accessible from many functions.
//
//  All caps indicates a constant
//  Some lower case variables may also be constants
//  Capitalized constants indicate that we expect that variable to remain a constant
//  even in future code changes, ie statically configured with an initial.
//
//



var canvas;
var origin = [0, 0, 0];
var frame_rate = 20;
var saveTimeout = 10*1000;

var forward_axis_size = 0.1;
var vertical_axis_size = 0.05;      




// to prevent camera from rotating beyond straight vertical
var vertical_camera_rotation = 0;
var zoom_dist = 1;

var zoom_factor = 0.83;
var zoom_scale = 2.667;  // scalar zoom property.
var zoom_dist = 1;
var last_zoom_dist = 1;
var zoom_factor = 0.83;



// camera animation
var max_move_delta = 0.01;
var max_angle_delta = Math.PI;

var delta_horizontal_angle = 0;
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var point_projections = [];
var line_midpoint_projections = [];

var highlight_object = null;
var mouse_dragging = false;
var last_mouse_down = null;
var mouse_loc = null;
var MIN_DRAG_DIST = 10;

var POINT_HIGHLIGHT_DIST = 10;
var LINE_HIGHLIGHT_DIST = 15;

var MOTION_SPEED_BASE =  2.8;

var selected_points = [];
var selected_lines = [];

var msg = //"3D drawing tool\n\n" +
          "Select     Left Click\n" +
		  "Rotate     Right Click\n" +
		  "Move       wasd, qe\n" +
		  "Copy       Space\n" +
		  "Delete     x\n" +
		  "\n" +
		  "Click the red dot to create a point\n" +
	      "Spam a motion key to increase speed\n";		  
	
	
var helpmsg = //"3D drawing tool\n\n" +
              "Select     Left Click\n" +
		      "Rotate     Right Click\n" +
		      "Move       wasd, qe\n" +
		      "Copy       Space\n" +
		      "Delete     x\n" +
		      "\n" +
		      "Click the red dot to create a point\n" +
			  "Drag between two points to connect them" +
	          "Spam a motion key to increase speed\n";
			  
var msg = helpmsg;


var view_transform =
    [[1, 0, 0],
     [0, 1, 0],
     [0, 0, 1]];

            


var key_state = {};
var key_state_augmentation_timeout = 150; // the permissible time in milliseconds since the last key event to still allow the key state to augment instead of clearing.




// constants
var MIN_DRAG_DIST = 10;
var POINT_HIGHLIGHT_DIST = 10;
var LINE_HIGHLIGHT_DIST = 15;

var MOTION_SPEED_BASE =  2.8;

var CENTER_POINT_COLOR = "rgba(250, 0, 0, 1.0)";
var AXIS_POINT_COLOR = "rgba(0, 0, 250, 1.0)";

var CENTER_POINT_RADIUS = 2.5;
var MIN_AXIS_POINT_RADIUS = 1;
var MAX_AXIS_POINT_RADIUS = 4;
var AXIS_LINE_WIDTH = 1.333;

var FORWARD_AXIS_LEN = 0.15;
var VERTICAL_AXIS_LEN = 0.075;


//  The point, line, and fill colors are the same for a reason.
//  Because all the colors are the same we don't have to worry about occlusion and z-order,
//  because no matter which order colors are painted onto a pixel, the final result will be the same.
//  Observe that this assertion holds even with a color with an alpha channel.
//  This helps us use our 2d canvas happily and not have to worry about draw order or non-sensical visual effects from wrong order.
//  With transparency we can still see each individual object and it almost mimics occlusion.
//  This is meant to be a lightweight drawing tool, not a full featured one, so this decision is limiting but fits our goals perfectly.

var POINT_COLOR = "rgba(0, 0, 0, 0.9)";
var LINE_COLOR = "rgba(0, 0, 0, 0.9)";
var FILL_COLOR = "rgba(0, 0, 0, 0.9)";

var LINE_WIDTH = 1;




function addKeyListener(keycode, func){
    if(!key_state[keycode]) key_state[keycode] = {};
    
    var key_obj = key_state[keycode];
    if(!key_obj.listeners) key_obj.listeners = [];
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    ctx.clearRect(0, 0, w, h);
	
    
	ctx.strokeStyle = "rgba(0, 0, 0, 0.9)";
    ctx.stroke();
    
	ctx.fillStyle = "rgba(0, 0, 0, 0.9)";
	
    for(var k in solo_points){
       var pt = point_projections[k];
       if(pt) ctx.fillRect(pt[0] - 2, pt[1] - 2, 4, 4); }
        
	//
	//  The following drawing of axes is to help provide an perspective
	//  The nuances of this draw behavior are created to provide visual cues for interpreting perspective and depth.
	//  
	//  Because we use a 2d canvas library for the drawing the rest of the points/shapes after projection, these visual information nuances are important.
	//

	// axis lines and dots
	
    var faxis_pt = project(canvas, vector_add(origin, [0, 0, forward_axis_size]), view_transform, origin);
	var vaxis_pt = project(canvas, vector_add(origin, [0, -vertical_axis_size, 0]), view_transform, origin);
    var faxis_pt = project(canvas, vector_add(origin, [0, 0, FORWARD_AXIS_LEN]), view_transform, origin);
	var vaxis_pt = project(canvas, vector_add(origin, [0, -VERTICAL_AXIS_LEN, 0]), view_transform, origin);
	
	ctx.fillStyle = "rgba(0,0,0,1.0)";
	ctx.fillStyle = AXIS_POINT_COLOR;
	
	var fdot = vector_dot(view_transform[2], [0, 0, 1]);
	
	var a = MIN_AXIS_POINT_RADIUS;  //random letters for intermediate computations
	var b = MAX_AXIS_POINT_RADIUS;
	var c = (a+b)/2;
	var d = (b-a)/2;
	
	var fr = 4 - 2.5 * fdot;
	var fr = c - d * fdot;
	var vdot = vector_dot(view_transform[2], [0, -1, 0]);
	var vr = 4 - 2.5 * vdot;
	var vr = c - d * vdot;
	
	ctx.lineWidth = 1.333;
	ctx.lineWidth = AXIS_LINE_WIDTH;
	ctx.beginPath();
	
	if(fdot >=0 && faxis_pt){ // occlude this axis, draw first
		ctx.moveTo(w/2, h/2);
		ctx.lineTo(faxis_pt[0], faxis_pt[1]);	
		ctx.fillRect(faxis_pt[0] - fr/2, faxis_pt[1] - fr/2, fr, fr); }
		ctx.fillRect(faxis_pt[0] - fr, faxis_pt[1] - fr, 2*fr, 2*fr); }
		
	if(vdot >=0 && vaxis_pt){ // occlude this axis, draw first
		ctx.moveTo(w/2, h/2);
		ctx.lineTo(vaxis_pt[0], vaxis_pt[1]);	
		ctx.fillRect(vaxis_pt[0] - vr/2, vaxis_pt[1] - vr/2, vr, vr); }
		ctx.fillRect(vaxis_pt[0] - vr, vaxis_pt[1] - vr, 2*vr, 2*vr); }
	
	ctx.stroke()
	ctx.stroke();
	
		
	// draw center red square
	ctx.fillStyle = "rgba(250, 0, 0, 1.0)";
	ctx.fillRect(w/2 - 3, h/2 - 3, 6, 6);
	ctx.fillStyle = CENTER_POINT_COLOR;
	var cr = CENTER_POINT_RADIUS;
	ctx.fillRect(w/2 - cr, h/2 - cr, 2*cr, 2*cr);
		
	ctx.fillStyle = "rgba(0,0,0,1.0)";
	ctx.beginPath();
	ctx.fillStyle = AXIS_POINT_COLOR;
	
	
	if(fdot < 0 && faxis_pt){
		ctx.beginPath();
		ctx.moveTo(w/2, h/2);
		ctx.lineTo(faxis_pt[0], faxis_pt[1]);	
		ctx.fillRect(faxis_pt[0] - fr/2, faxis_pt[1] - fr/2, fr, fr); }
		ctx.lineTo(faxis_pt[0], faxis_pt[1]);
		ctx.stroke();
		ctx.fillRect(faxis_pt[0] - fr, faxis_pt[1] - fr, 2*fr, 2*fr); }
		
	if(vdot < 0 && vaxis_pt){
		ctx.beginPath();
		ctx.moveTo(w/2, h/2);
		ctx.lineTo(vaxis_pt[0], vaxis_pt[1]);
		ctx.fillRect(vaxis_pt[0] - vr/2, vaxis_pt[1] - vr/2, vr, vr); }
	
	ctx.stroke();
		ctx.stroke();
		ctx.fillRect(vaxis_pt[0] - vr, vaxis_pt[1] - vr, 2*vr, 2*vr); }
	

	// reset line width
	ctx.lineWidth = 1;
	ctx.lineWidth = LINE_WIDTH;
	
	

    
		
	
	for(var i = 0; i < selected_points.length; ++i){
		var pt;
		
		if(selected_points[i] == -1)
			pt = [w/2, h/2];
		else pt = point_projections[selected_points[i]];
		
		ctx.fillStyle = "rgba(0, 0, 0, 0.9)";
		ctx.fillStyle = POINT_COLOR;
		if(pt) ctx.fillRect(pt[0] - 4, pt[1] - 4, 8, 8); }
	
	
	if(highlight_object !== null){
		
		
		if(highlight_object < point_projections.length){
			var pt;
			if(highlight_object == -1)
				pt = [w/2, h/2];
			else pt = point_projections[highlight_object];
			
			ctx.fillStyle = "rgba(50, 50, 50, .6)";    
			ctx.fillRect(pt[0] - 4, pt[1] - 4, 8, 8);
			ctx.fillRect(pt[0] - 4, pt[1] - 4, 8, 8);  // TODO getting a error here that pt is null 
			document.body.style.cursor = "hand"; }
			
		else if(highlight_object < point_projections.length + line_midpoint_projections.length){
			// alert("drawing highlighted line");
			
			var line = lines[highlight_object - point_projections.length];
			if(line){
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Fossil version [66ee0beb9b] 2023-05-31 15:26:08