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Illustration centering on anchor #12

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a26f4d8
PoC demo of centering on anchor
asl97 May 10, 2026
e930c94
Add "isolated" mode to Illustration
asl97 May 10, 2026
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166 changes: 166 additions & 0 deletions demos/centered/center.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,166 @@
// ----- setup ----- //
var isSpinning = true;

var model = new Zdog.Anchor();

// Made with Zdog

const orange = '#E62';
const garnet = '#C25';
const eggplant = '#636';

// origin dot
var dot = new Zdog.Shape({
addTo: model,
stroke: 8,
color: eggplant,
});

var zCircle = new Zdog.Ellipse({
addTo: model,
diameter: 20,
quarters: 2,
closed: true,
translate: { z: 40 },
scale: 1,
stroke: 8,
fill: true,
color: eggplant,
});

// z line
new Zdog.Shape({
addTo: zCircle,
path: [ {}, zCircle.translate.copy().multiply({ z: -1 }) ],
scale: 1/zCircle.scale.z,
stroke: 2,
color: zCircle.color,
});

var xRect = new Zdog.Rect({
addTo: zCircle,
width: 20,
height: 20,
translate: { x: 40 },
stroke: 8,
fill: true,
color: garnet,
});

// x line
new Zdog.Shape({
addTo: xRect,
path: [ {}, xRect.translate.copy().multiply({ x: -1 }) ],
stroke: 2,
color: xRect.color,
});

var yTri = new Zdog.Polygon({
addTo: xRect,
radius: 10,
sides: 3,
translate: { y: -60 },
stroke: 8,
fill: true,
color: orange,
});

// y line
new Zdog.Shape({
addTo: yTri,
path: [ {}, yTri.translate.copy().multiply({ y: -1 }) ],
stroke: 2,
color: yTri.color,
});

var canvasDot = new Zdog.Illustration({
element: 'canvas.dot',
dragRotate: model,
//centered: dot,
onDragStart: function() {
isSpinning = false;
},
});

var canvasEggplant = new Zdog.Illustration({
element: 'canvas.eggplant',
dragRotate: model,
centered: zCircle,
onDragStart: function() {
isSpinning = false;
},
});
var canvasGarnet = new Zdog.Illustration({
element: 'canvas.garnet',
dragRotate: model,
centered: xRect,
onDragStart: function() {
isSpinning = false;
},
});
var canvasOrange = new Zdog.Illustration({
element: 'canvas.orange',
dragRotate: model,
centered: yTri,
onDragStart: function() {
isSpinning = false;
},
});

var svgDot = new Zdog.Illustration({
element: 'svg.dot',
dragRotate: model,
isolated: true,
//centered: dot,
onDragStart: function() {
isSpinning = false;
},
});
var svgEggplant = new Zdog.Illustration({
element: 'svg.eggplant',
dragRotate: model,
isolated: true,
centered: zCircle,
onDragStart: function() {
isSpinning = false;
},
});
var svgGarnet = new Zdog.Illustration({
element: 'svg.garnet',
dragRotate: model,
isolated: true,
centered: xRect,
onDragStart: function() {
isSpinning = false;
},
});
var svgOrange = new Zdog.Illustration({
element: 'svg.orange',
dragRotate: model,
centered: yTri,
onDragStart: function() {
isSpinning = false;
},
});

// ----- animate ----- //

function animate() {
model.rotate.y += isSpinning ? 0.03 : 0;
model.updateGraph();

canvasDot.renderGraph( model );
canvasEggplant.renderGraph( model );
canvasGarnet.renderGraph( model );
canvasOrange.renderGraph( model );

svgDot.renderGraph( model );
svgEggplant.renderGraph( model );
svgGarnet.renderGraph( model );
svgOrange.renderGraph( model );

requestAnimationFrame( animate );
}

animate();

60 changes: 60 additions & 0 deletions demos/centered/index.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />

<title>centered</title>

<style>
html { height: 100%; }

body {
margin: 0;
display: grid;
grid-template-columns: 1fr 1fr;
place-items: center;
background: white;
font-family: sans-serif;
text-align: center;
}

.illo {
display: block;
cursor: move;
background: #FDB;
border-radius: 8px;
margin: 20px 2%;
}
</style>

</head>
<body>

<canvas class="dot illo" width="200" height="200"></canvas>
<canvas class="eggplant illo" width="200" height="200"></canvas>
<canvas class="garnet illo" width="200" height="200"></canvas>
<canvas class="orange illo" width="200" height="200"></canvas>

<svg class="dot illo" width="200" height="200"></svg>
<svg class="eggplant illo" width="200" height="200"></svg>
<svg class="garnet illo" width="200" height="200"></svg>
<svg class="orange illo" width="200" height="200"></svg>

<script src="../../js/boilerplate.js"></script>
<script src="../../js/canvas-renderer.js"></script>
<script src="../../js/svg-renderer.js"></script>
<script src="../../js/vector.js"></script>
<script src="../../js/anchor.js"></script>
<script src="../../js/path-command.js"></script>
<script src="../../js/shape.js"></script>
<script src="../../js/ellipse.js"></script>
<script src="../../js/rect.js"></script>
<script src="../../js/polygon.js"></script>
<script src="../../js/group.js"></script>
<script src="../../js/dragger.js"></script>
<script src="../../js/illustration.js"></script>
<script src="center.js"></script>

</body>
</html>
39 changes: 30 additions & 9 deletions js/illustration.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ var TAU = utils.TAU;
var Illustration = Anchor.subclass({
element: undefined,
centered: true,
isolated: false,
zoom: 1,
dragRotate: false,
resize: false,
Expand Down Expand Up @@ -157,9 +158,13 @@ Illustration.prototype.prerenderCanvas = function() {
ctx.clearRect( 0, 0, this.canvasWidth, this.canvasHeight );
ctx.save();
if ( this.centered ) {
var centerX = this.width / 2 * this.pixelRatio;
var centerY = this.height / 2 * this.pixelRatio;
ctx.translate( centerX, centerY );
var centerX = this.width / 2;
var centerY = this.height / 2;
if (this.centered.origin) {
centerX -= this.centered.renderOrigin.x;
centerY -= this.centered.renderOrigin.y;
}
ctx.translate( centerX * this.pixelRatio, centerY * this.pixelRatio);
}
var scale = this.pixelRatio * this.zoom;
ctx.scale( scale, scale );
Expand All @@ -172,6 +177,25 @@ Illustration.prototype.postrenderCanvas = function() {

// ----- svg ----- //

Illustration.prototype.prerenderSvg = function() {
var viewWidth = this.width / this.zoom;
var viewHeight = this.height / this.zoom;
var viewX = this.centered ? -viewWidth/2 : 0;
var viewY = this.centered ? -viewHeight/2 : 0;
if (this.centered.origin) {
viewX += this.centered.renderOrigin.x;
viewY += this.centered.renderOrigin.y;
}
this.element.setAttribute( 'viewBox', viewX + ' ' + viewY + ' ' +
viewWidth + ' ' + viewHeight );
}

Illustration.prototype.postrenderSvg = function() {
if (this.isolated){
this.element.innerHTML = this.element.innerHTML;
}
}

Illustration.prototype.setSvg = function( element ) {
this.element = element;
this.isSvg = true;
Expand All @@ -185,12 +209,7 @@ Illustration.prototype.setSvg = function( element ) {
Illustration.prototype.setSizeSvg = function( width, height ) {
this.width = width;
this.height = height;
var viewWidth = width / this.zoom;
var viewHeight = height / this.zoom;
var viewX = this.centered ? -viewWidth/2 : 0;
var viewY = this.centered ? -viewHeight/2 : 0;
this.element.setAttribute( 'viewBox', viewX + ' ' + viewY + ' ' +
viewWidth + ' ' + viewHeight );
this.prerenderSvg();
if ( this.resize ) {
// remove size attributes, let size be determined by viewbox
this.element.removeAttribute('width');
Expand All @@ -204,8 +223,10 @@ Illustration.prototype.setSizeSvg = function( width, height ) {
Illustration.prototype.renderGraphSvg = function( item ) {
item = item || this;
empty( this.element );
this.prerenderSvg();
this.onPrerender( this.element );
Anchor.prototype.renderGraphSvg.call( item, this.element );
this.postrenderSvg();
};

function empty( element ) {
Expand Down