概要
Canvasで交差点を描く
ソース
<html> <head> <script type="text/javascript"> function draw(list) { var canvas = document.getElementById('cv'); var ctx = canvas.getContext('2d'); draw_line(ctx, list, 30, 10, 30 + 50 * list.length, 10); draw_line(ctx, list, 30, 500, 30 + 50 * list.length, 500); for (i = 0; i < list.length; i++) { draw_line(ctx, list, 50 * (i + 1), 10, 50 * list[i], 500); } } function draw_line(ctx, list, start_x, start_y, end_x, end_y) { ctx.beginPath(); ctx.moveTo(start_x, start_y); ctx.lineTo(end_x, end_y); ctx.stroke(); } </script> </head> <body onload="draw(new Array(3, 4, 2, 1, 8, 6, 7, 5))" style="background-color:#eeeeee;"> <canvas id="cv" style="border-style:groove;" width="1200" height="600"></canvas> </body> </html>