//LINECHART

var data;
var dict = {};
var max_year = 0;
var max_num = 0;
var xy_array = [];


function preload() {
	data = loadTable('health.csv', 'csv', 'header');
}

function setup() {
	createCanvas(1300,1300);

	for(var r = 0; r < data.getRowCount(); r++) {
		var year = data.getNum(r, 5);
		var number = data.getNum(r,3);
		//find the unique years, add to dictionary
		if(data.getNum(r, 5) in dict) {
			dict[year] += number;
		}
		
		else {
			dict[year] = number;
		}
	}

	min_year = min(data.getColumn(5));
	max_year = max(data.getColumn(5));

	min_num = Infinity;
	max_num = 0;
	for(year in dict) {
		if(dict[year] < min_num) {
			min_num = dict[year];
		}
		if(dict[year] > max_num) {
			max_num = dict[year];
		}
	}

	var counter = 0;
	for(var year in dict) {
		var temp = [];
		temp[0] = year;
		temp[1] = dict[year];
		xy_array[counter] = temp;
		counter++;
	}

}

function draw() {
	clear();
	//axes drawn (draw little lines on axes)
	var num_ticks = 10;

	line(100,100,100,600);

	line(100,600,700,600);
	textSize(20);

	text("Line Chart: Year v Number", 50,50);

	textSize(10);
	text("Year", 350, 615);
	text("Number", 5, 300);

	range_x = max_year - min_year;
	step = range_x/num_ticks;

	var scale_x = 500/range_x;
	var scale_y = 500/max_num;

	var count_num = 0;
	var count_year = 0;
	for(var y = 600; y >= 100; y--) {
	  	if(y%50 == 0) {
	 		line(90,y,110,y);
	 		fill(0);
	 		text(round(count_num), 50, y);
	 		count_num += round(.1 * max_num); //this will give me ten ticks
	 	}
	}
	for(var x = 100; x <= 600; x++) {
		if(x%50 == 0) {
			line(x, 590, x, 610);
	 		fill(0);
	 		text(round(min_year + count_year * step), x, 650);
	 		count_year += 1;
		}
	}

	var count_x = 0;
	for(var i = 0; i < xy_array.length - 1; i++) {
		var x_pos = 100 + count_x*scale_x;
		var y_pos =  600 - xy_array[i][1]*scale_y;

		var next_x = 100 + (count_x+1)*scale_x;
		var next_y = 600 - xy_array[i+1][1]*scale_y;
		ellipse(x_pos, y_pos, 3, 3);
		if(dist(x_pos, y_pos, mouseX, mouseY) < 5) {
			fill(255,0,0);
			text("Year: " + round(xy_array[i][0]) + " Number: " + xy_array[i][1], x_pos + 5, 700 - y_pos);
		}
		line(x_pos, y_pos, next_x, next_y);
		count_x++;
	}	
	
}