create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Sizing of GraphObjects | GoJS
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<div class="px-4 pb-16 w-full overflow-hidden prose">
<h1>Sizing GraphObjects</h1>
<p>
The size of a <a>GraphObject</a> is determined by the values of the <a>GraphObject.desiredSize</a>, <a>GraphObject.minSize</a>, <a>GraphObject.maxSize</a> and
<a>GraphObject.stretch</a> properties. The actual size of an object after its containing panel measures and arranges it is given by several read-only
properties: <a>GraphObject.naturalBounds</a>, <a>GraphObject.measuredBounds</a>, and <a>GraphObject.actualBounds</a>.
</p>
<p>
The <a>GraphObject.width</a> property is exactly the same as the <a>Size.width</a> component of the <a>GraphObject.desiredSize</a>. Similarly, the
<a>GraphObject.height</a> property corresponds to the desiredSize's height. The default value of <a>GraphObject.desiredSize</a> is <code>(NaN, NaN)</code> --
meaning that the size must be computed. One can set the width to a real number and leave the height to be <code>NaN</code>, or vice-versa.
</p>
<p>
Users can also change the size of an object within a Part via the <a>ResizingTool</a>: Introduction to the <a href="tools.html#ResizingTool">ResizingTool</a>.
</p>
<h3 id="DesiredSizeMinSizeAndMaxSize">DesiredSize, MinSize, and MaxSize</h3>
<p>
When the <a>GraphObject.desiredSize</a> property is set to real numbers it gets that as its natural size. When the desiredSize property is not set but there
is a <a>GraphObject.stretch</a> value, it will get the size of the available space. When desiredSize is not set and there is no stretch, an object prefers
being its natural size, based on the type of object that it is and the other properties that it has.
</p>
<p>
But the effective width and effective height, whether given by desiredSize or computed, are each constrained by the <a>GraphObject.maxSize</a> and by the
<a>GraphObject.minSize</a>. The minimum size takes precedence over the maximum size in case of conflict.
</p>
<p>
The size for a GraphObject in a Table <a>Panel</a> may also be constrained by the width of the column and the height of the row that the object is in.
</p>
<pre class="lang-js" id="shapeSizes"><code>
diagram.add(
new go.Part()
.add(
new go.Panel("Table", { defaultAlignment: go.Spot.Left })
.addColumnDefinition(0, { width: 200 })
.addColumnDefinition(1, { width: 15 })
.add(
new go.Shape("Rectangle", {
row: 0, column: 0, fill: "green",
width: 100, height: 20 }),
new go.TextBlock({ row: 0, column: 2,
text: "desiredSize: 100x20, no minSize, no maxSize" }),
new go.Shape("Rectangle", {
row: 1, column: 0, fill: "red",
width: 100, height: 20,
minSize: new go.Size(150, 10) }),
new go.TextBlock({ row: 1, column: 2,
text: "desired: 100x20, min: 150x10" }),
new go.Shape("Rectangle", {
row: 2, column: 0, fill: "yellow",
width: 100, height: 20,
maxSize: new go.Size(50, 300) }),
new go.TextBlock({ row: 2, column: 2,
text: "desired: 100x20, max: 50x300" }),
new go.Shape("Rectangle", {
row: 3, column: 0, fill: "red",
width: 100, height: 20,
minSize: new go.Size(150, 10), maxSize: new go.Size(50, 300) }),
new go.TextBlock({ row: 3, column: 2,
text: "desired: 100x20, min: 150x10, max: 50x300" })
)
));
</code></pre>
<script>
goCode('shapeSizes', 600, 120);
</script>
<h3 id="MeasuredAndActualSizes">Measured and Actual Sizes</h3>
<p>
Every GraphObject also has a <a>GraphObject.measuredBounds</a>, which describes how big the object seems to be, and a <a>GraphObject.actualBounds</a>, which
describes the position and size of an object. These read-only properties take into account any non-zero <a>GraphObject.angle</a> or non-unitary
<a>GraphObject.scale</a>. These measurements are in the containing <a>Panel</a>'s coordinate system.
</p>
<pre class="lang-js" id="sizedShapes"><code>
function getSizeString(s) {
return s.width.toFixed(2) + "x" + s.height.toFixed(2);
}
const table =
new go.Part("Table")
.add(
new go.Shape({ name: "A", row: 0, column: 1,
figure: "Club", fill: "green", background: "lightgray",
width: 40, height: 40,
}), // default angle is zero; default scale is one
new go.Shape({ name: "B", row: 0, column: 2,
figure: "Club", fill: "green", background: "lightgray",
width: 40, height: 40,
angle: 30 }),
new go.Shape({ name: "C", row: 0, column: 3,
figure: "Club", fill: "green", background: "lightgray",
width: 40, height: 40,
scale: 1.5 }),
new go.Shape({ name: "D", row: 0, column: 4,
figure: "Club", fill: "green", background: "lightgray",
width: 40, height: 40,
angle: 30, scale: 1.5 }),
new go.TextBlock("naturalBounds:", { row: 1, column: 0, alignment: go.Spot.Left }),
new go.TextBlock("measuredBounds:", { row: 2, column: 0, alignment: go.Spot.Left }),
new go.TextBlock("actualBounds:", { row: 3, column: 0, alignment: go.Spot.Left }),
new go.TextBlock({ row: 1, column: 1, margin: 4 })
.bindObject("text", "naturalBounds", getSizeString, null, "A"),
new go.TextBlock({ row: 1, column: 2, margin: 4 })
.bindObject("text", "naturalBounds", getSizeString, null, "B"),
new go.TextBlock({ row: 1, column: 3, margin: 4 })
.bindObject("text", "naturalBounds", getSizeString, null, "C"),
new go.TextBlock({ row: 1, column: 4, margin: 4 })
.bindObject("text", "naturalBounds", getSizeString, null, "D"),
new go.TextBlock({ row: 2, column: 1, margin: 4 })
.bindObject("text", "measuredBounds", getSizeString, null, "A"),
new go.TextBlock({ row: 2, column: 2, margin: 4 })
.bindObject("text", "measuredBounds", getSizeString, null, "B"),
new go.TextBlock({ row: 2, column: 3, margin: 4 })
.bindObject("text", "measuredBounds", getSizeString, null, "C"),
new go.TextBlock({ row: 2, column: 4, margin: 4 })
.bindObject("text", "measuredBounds", getSizeString, null, "D"),
new go.TextBlock({ row: 3, column: 1, margin: 4 })
.bindObject("text", "actualBounds", getSizeString, null, "A"),
new go.TextBlock({ row: 3, column: 2, margin: 4 })
.bindObject("text", "actualBounds", getSizeString, null, "B"),
new go.TextBlock({ row: 3, column: 3, margin: 4 })
.bindObject("text", "actualBounds", getSizeString, null, "C"),
new go.TextBlock({ row: 3, column: 4, margin: 4 })
.bindObject("text", "actualBounds", getSizeString, null, "D")
);
diagram.add(table);
setTimeout(() => {
table.data = {}; // cause bindings to be evaluated after Shapes are measured
}, 1);
</code></pre>
<script>
goCode('sizedShapes', 600, 180);
</script>
<p>
Note that the size of the regular 40x40 shape is 41x41. The additional size is due to the thickness of the pen (<a>Shape.strokeWidth</a>) used to outline the
shape. Rotating or increasing the scale causes the 40x40 shape to actually take up significantly more space.
</p>
<p>
To summarize: the <a>GraphObject.desiredSize</a> (a.k.a. <a>GraphObject.width</a> and <a>GraphObject.height</a>) and the <a>GraphObject.naturalBounds</a>
are in the object's local coordinate system.
The <a>GraphObject.minSize</a>, <a>GraphObject.maxSize</a>, <a>GraphObject.margin</a>, <a>GraphObject.measuredBounds</a>, and <a>GraphObject.actualBounds</a>
are all in the containing <a>Panel</a>'s coordinate system, or in document coordinates if there is no such panel because it is a <a>Part</a>.
</p>
<h3 id="StretchingOfGraphObjects">Stretching of GraphObjects</h3>
<p>
When you specify a <a>GraphObject.stretch</a> value other than <a>Stretch.None</a>, the object will stretch or contract to fill the available space. However,
the <a>GraphObject.maxSize</a> and <a>GraphObject.minSize</a> properties still limit the size.
</p>
<p>
But setting the <a>GraphObject.desiredSize</a> (or equivalently, the <a>GraphObject.width</a> and/or <a>GraphObject.height</a>) will cause any stretch value
to be ignored.
</p>
<p>In the following examples the left column is constrained to have a width of 200.</p>
<pre class="lang-js" id="stretchSizes"><code>
diagram.add(
new go.Part()
.add(
new go.Panel("Table", { defaultAlignment: go.Spot.Left })
.addColumnDefinition(0, { width: 200 })
.addColumnDefinition(1, { width: 15 })
.add(
new go.Shape("Rectangle", {
row: 0, column: 0, fill: "green",
stretch: go.Stretch.Fill }),
new go.TextBlock({ row: 0, column: 2,
text: "stretch: Fill, no minSize, no maxSize" }),
new go.Shape("Rectangle", {
row: 1, column: 0, fill: "red",
stretch: go.Stretch.Fill,
minSize: new go.Size(150, 10) }),
new go.TextBlock({ row: 1, column: 2,
text: "stretch: Fill, min: 150x10" }),
new go.Shape("Rectangle", {
row: 2, column: 0, fill: "yellow",
stretch: go.Stretch.Fill,
maxSize: new go.Size(50, 300) }),
new go.TextBlock({ row: 2, column: 2,
text: "stretch: Fill, max: 50x300" }),
new go.Shape("Rectangle", {
row: 3, column: 0, fill: "red",
stretch: go.Stretch.Fill,
minSize: new go.Size(150, 10), maxSize: new go.Size(50, 300) }),
new go.TextBlock({ row: 3, column: 2,
text: "stretch: Fill, min: 150x10, max: 50x300" }),
new go.Shape("Rectangle", {
row: 4, column: 0, fill: "red",
width: 100, stretch: go.Stretch.Fill }),
new go.TextBlock({ row: 4, column: 2,
text: "desired width & stretch: ignore stretch" })
)
));
</code></pre>
<script>
goCode('stretchSizes', 600, 120);
</script>
<p>
To summarize, if <a>GraphObject.desiredSize</a> is set to a real number, any <a>GraphObject.stretch</a> is ignored.
If <a>GraphObject.maxSize</a> conflicts with that value, it takes precedence.
And if <a>GraphObject.minSize</a> conflicts with those values, it takes precedence.
The width values are constrained independently of the height values.
</p>
<h2 id="StretchAndAlignment">Stretch and Alignment</h2>
<p>
The size of a <a>GraphObject</a> in a <a>Panel</a> is determined by many factors. The <a>GraphObject.stretch</a> property specifies whether the width and/or
height should take up all of the space given to it by the Panel. When the width and/or height is not stretched to fill the given space, the
<a>GraphObject.alignment</a> property controls where the object is placed if it is smaller than available space. One may also stretch the width while aligning
vertically, just as one may also stretch vertically while aligning along the X axis.
</p>
<p>
The alignment value for a GraphObject, if not given by the value of <a>GraphObject.alignment</a>, may be inherited. If the object is in a Table Panel, the
value may inherit from the RowColumnDefinitions of the row and of the column that the object is in. Finally the value may be inherited from the
<a>Panel.defaultAlignment</a> property.
</p>
<p>
If you specify a fill stretch (horizontal or vertical or both) and an alignment, the alignment will be ignored. Basically if an object is exactly the size
that is available to it, there is only one position for it, so all alignments are the same.
</p>
<h3 id="AlignmentOfShapes">Alignment of Shapes</h3>
<pre class="lang-js" id="shapeAlignment"><code>
diagram.add(
new go.Part()
.add(
new go.Panel("Table", { defaultAlignment: go.Spot.Left })
.addColumnDefinition(0, { width: 200 })
.addColumnDefinition(1, { width: 15 })
.add(
new go.Shape("Rectangle", {
row: 0, column: 0, fill: "lightblue",
width: 100, height: 20, alignment: go.Spot.Left }),
new go.TextBlock({ row: 0, column: 2, text: "alignment: Left" }),
new go.Shape("Rectangle", {
row: 1, column: 0, fill: "lightblue",
width: 100, height: 20, alignment: go.Spot.Center }),
new go.TextBlock({ row: 1, column: 2, text: "alignment: Center" }),
new go.Shape("Rectangle", {
row: 2, column: 0, fill: "lightblue",
width: 100, height: 20, alignment: go.Spot.Right }),
new go.TextBlock({ row: 2, column: 2, text: "alignment: Right" }),
new go.Shape("Rectangle", {
row: 3, column: 0, fill: "yellow",
height: 20, stretch: go.Stretch.Horizontal }),
new go.TextBlock({ row: 3, column: 2, text: "stretch: Horizontal" }),
new go.Shape("Rectangle", {
row: 4, column: 0, fill: "yellow",
height: 20, stretch: go.Stretch.Horizontal, alignment: go.Spot.Right }),
new go.TextBlock({ row: 4, column: 2,
text: "stretch: Horizontal, ignore alignment" })
)
));
</code></pre>
<script>
goCode('shapeAlignment', 600, 120);
</script>
<p>
When the element is larger than the available space, the <a>GraphObject.alignment</a>
property still controls where the element is positioned. However the element will be clipped to fit.
</p>
<p>
To make things clearer in the following examples we have made the shape stroke thicker and added a margin to separate the shapes.
</p>
<pre class="lang-js" id="bigShapeAlignment"><code>
diagram.add(
new go.Part()
.add(
new go.Panel("Table", { defaultAlignment: go.Spot.Left })
.addColumnDefinition(0, { width: 200 })
.addColumnDefinition(1, { width: 15 })
.add(
new go.Shape("Rectangle", {
row: 0, column: 0, fill: "lightblue", strokeWidth: 2,
width: 300, height: 20, margin: 2, alignment: go.Spot.Left }),
new go.TextBlock({ row: 0, column: 2, text: "big obj alignment: Left" }),
new go.Shape("Rectangle", {
row: 1, column: 0, fill: "lightblue", strokeWidth: 2,
width: 300, height: 20, margin: 2, alignment: go.Spot.Center }),
new go.TextBlock({ row: 1, column: 2, text: "big obj alignment: Center" }),
new go.Shape("Rectangle", {
row: 2, column: 0, fill: "lightblue", strokeWidth: 2,
width: 300, height: 20, margin: 2, alignment: go.Spot.Right }),
new go.TextBlock({ row: 2, column: 2, text: "big obj alignment: Right" })
)
));
</code></pre>
<script>
goCode('bigShapeAlignment', 600, 100);
</script>
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