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2_21_dial.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>2-21 Drawing a dial</title>
</head>
<body>
<canvas id="canvas" width="640" height="480"></canvas>
</body>
<script type="text/javascript">
var cvs = document.getElementById('canvas'),
ctx = cvs.getContext('2d'),
CENTROID_RADIUS = 10,
CENTROID_STROKE_STYLE = 'rgba(0,0,0,0.5)',
CENTROID_FILL_STYLE = 'rgba(80,190,240,0.6)',
RING_INNER_RADIUS = 35,
RING_OUTER_RADIUS = 55,
ANNOTATIONS_FILL_STYLE = 'rgba(0,0,230,0.9)',
ANNOTATIONS_TEXT_SIZE = 12,
TICK_WIDTH = 10,
TICK_LONG_STROKE_STYLE = 'rgba(100,140,230,0.9)',
TICK_SHORT_STROKE_STYLE = 'rgba(100,140,230,0.7)',
TRACKING_DIAL_STROKING_STYLE = 'rgba(100,140,230,0.5)',
GUIDEWIRE_STROKE_STYLE = 'goldenrod',
GUIDEWIRE_FILL_STYLE = 'rgba(250,250,0,0.6)',
circle = {
x : cvs.width / 2,
y : cvs.height / 2,
radius : 150
};
function drawGrid(color, stepx, stepy) {
ctx.save();
ctx.shadowColor = undefined;
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.strokeStyle = color;
ctx.fillStyle = '#ffffff';
ctx.lineWidth = 0.5;
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
for(var i = stepx + 0.5; i < ctx.canvas.width; i += stepx) {
ctx.beginPath();
ctx.moveTo(i, 0);
ctx.lineTo(i, ctx.canvas.height);
ctx.stroke();
}
for(var i = stepy + 0.5; i < ctx.canvas.height; i += stepy) {
ctx.beginPath();
ctx.moveTo(0, i);
ctx.lineTo(ctx.canvas.width, i);
ctx.stroke();
}
ctx.restore();
}
function drawDial() {
var loc = { x : circle.x, y : circle.y };
drawCentroid();
drawCentroidGuidewire(loc);
drawRing();
drawTickInnerCircle();
drawTicks();
drawAnnotations();
}
function drawCentroid () {
ctx.beginPath();
ctx.save();
ctx.strokeStyle = CENTROID_STROKE_STYLE;
ctx.fillStyle = CENTROID_FILL_STYLE;
ctx.arc(circle.x, circle.y, CENTROID_RADIUS, 0, Math.PI*2, false);
ctx.stroke();
ctx.fill();
ctx.restore();
}
function drawCentroidGuidewire (loc) {
var angle = -Math.PI / 4,
radius, endpt;
radius = circle.radius + RING_OUTER_RADIUS;
if(loc.x >= circle.x) {
endpt = {
x : circle.x + radius * Math.cos(angle),
y : circle.y + radius * Math.sin(angle)
};
} else {
endpt = {
x : circle.x - radius * Math.cos(angle),
y : circle.y - radius * Math.sin(angle)
};
}
ctx.save();
ctx.strokeStyle = GUIDEWIRE_STROKE_STYLE;
ctx.fillStyle = GUIDEWIRE_FILL_STYLE;
ctx.beginPath();
ctx.moveTo(circle.x, circle.y);
ctx.lineTo(endpt.x, endpt.y);
ctx.stroke();
ctx.beginPath();
ctx.strokeStyle = TICK_LONG_STROKE_STYLE;
ctx.arc(endpt.x, endpt.y, 5, 0, Math.PI*2, false);
ctx.fill();
ctx.stroke();
ctx.restore();
}
function drawRing () {
drawRingOuterCircle();
ctx.strokeStyle = 'rgba(0,0,0,0.1)';
ctx.arc(circle.x, circle.y, circle.radius + RING_INNER_RADIUS, 0, Math.PI*2, false);
ctx.fillStyle = 'rgba(100,140,230,0.1)';
ctx.fill();
ctx.stroke();
}
function drawRingOuterCircle () {
ctx.shadowColor = 'rgba(0,0,0,0.7)';
ctx.shadowOffsetX = 3;
ctx.shadowOffsetY = 3;
ctx.shadowBlur = 6;
ctx.strokeStyle = TRACKING_DIAL_STROKING_STYLE;
ctx.beginPath();
ctx.arc(circle.x, circle.y, circle.radius + RING_OUTER_RADIUS, 0, Math.PI*2, true);
ctx.stroke();
}
function drawTickInnerCircle () {
ctx.save();
ctx.beginPath();
ctx.strokeStyle = 'rgba(0,0,0,0.1)';
ctx.arc(circle.x, circle.y, circle.radius + RING_INNER_RADIUS - TICK_WIDTH, 0, Math.PI*2, false);
ctx.stroke();
ctx.restore();
}
function drawTick (angle, radius, cnt) {
var tickWidth = cnt % 4 === 0 ? TICK_WIDTH : TICK_WIDTH/2;
ctx.beginPath();
ctx.moveTo(circle.x + Math.cos(angle)*(radius - tickWidth),
circle.y + Math.sin(angle)*(radius - tickWidth));
ctx.lineTo(circle.x + Math.cos(angle)*(radius),
circle.y + Math.sin(angle)*(radius));
ctx.strokeStyle = TICK_SHORT_STROKE_STYLE;
ctx.stroke();
}
function drawTicks () {
var radius = circle.radius + RING_INNER_RADIUS,
ANGLE_MAX = 2*Math.PI,
ANGLE_DELTA = Math.PI / 64,
tickWidth;
ctx.save();
for(var angle = 0, cnt = 0; angle < ANGLE_MAX; angle += ANGLE_DELTA) {
drawTick(angle, radius, cnt++);
}
ctx.restore();
}
function drawAnnotations () {
var radius = circle.radius + RING_INNER_RADIUS;
ctx.save();
ctx.fillStyle = ANNOTATIONS_FILL_STYLE;
ctx.font = ANNOTATIONS_TEXT_SIZE + 'px Helvetica';
for(var angle = 0; angle < 2*Math.PI; angle += Math.PI/8) {
ctx.beginPath();
ctx.fillText((angle * 180 / Math.PI).toFixed(0),
circle.x + Math.cos(angle) * (radius - TICK_WIDTH*2),
circle.y - Math.sin(angle) * (radius - TICK_WIDTH*2));
}
ctx.restore();
}
ctx.shadowColor = 'rgba(0,0,0,0.4)';
ctx.shadowOffsetX = 2;
ctx.shadowOffsetY = 2;
ctx.shadowBlur = 4;
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
drawGrid('lightgray', 10, 10);
drawDial();
</script>
</html>