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ex-2-14.html
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ex-2-14.html
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="css/basic.css">
<title>축 그리기</title>
</head>
<body>
<canvas id="canvas" width="800" height="600">캔버스를 지원하지 않습니다.</canvas>
<h1>축 그리기</h1>
<script>
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d');
// 그리드
function drawGrid(){
context.lineWidth = 0.5;
context.strokeStyle = '#ddd';
for( var i = 9.5; i < canvas.width; i += 10 ){
context.beginPath();
context.moveTo(i, 0);
context.lineTo(i, canvas.height);
context.stroke();
}
for( var i = 9.5; i < canvas.height; i += 10 ){
context.beginPath();
context.moveTo(0, i);
context.lineTo(canvas.width, i);
context.stroke();
}
}
var margin = 40;
// x축
function axisX(color, lineWidth){
context.lineWidth = lineWidth;
context.strokeStyle = color;
context.beginPath();
context.moveTo(margin, canvas.height - margin);
context.lineTo(canvas.width - margin, canvas.height - margin);
context.stroke();
}
// y축
function axisY(color, lineWidth){
context.lineWidth = lineWidth;
context.strokeStyle = color;
context.beginPath();
context.moveTo(margin, canvas.height - margin);
context.lineTo(margin, margin);
context.stroke();
}
// tick X축
function drawTicksX(color, gap){
var numHorizontalTicks = (canvas.width - 2*margin) / gap,
tickSize;
context.strokeStyle = color;
for(var i = 1, spacing = 0; i < numHorizontalTicks; i++){
context.beginPath();
spacing += gap;
if( i % 5 === 0) {
context.lineWidth = 1;
tickSize = 10;
} else {
context.lineWidth = 0.5;
tickSize = 5;
}
context.moveTo(margin + spacing, canvas.height - margin - tickSize);
context.lineTo(margin + spacing, canvas.height - margin + tickSize);
context.stroke();
}
}
// tick Y축
function drawTicksY(color, gap){
var numVerticalTicks = (canvas.height - 2*margin) / gap,
tickSize;
context.strokeStyle = color;
for(var i = 1, spacing = 0; i < numVerticalTicks; i++){
context.beginPath();
spacing += 10;
if( i % 5 === 0) {
context.lineWidth = 1;
tickSize = 10;
} else {
context.lineWidth = 0.5;
tickSize = 5;
}
context.moveTo(margin - tickSize, canvas.height - margin - spacing);
context.lineTo(margin + tickSize, canvas.height - margin - spacing);
context.stroke();
}
}
// 실행
drawGrid();
axisX('navy', 1);
axisY('navy', 1);
drawTicksX('#ff0000', 10);
drawTicksY('#ff0000', 10);
</script>
</body>
</html>