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Add multiplied-out coordinates for canvas transforms #4473

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May 14, 2019
Merged

Add multiplied-out coordinates for canvas transforms #4473

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Add multiplied-out coordinates for canvas transforms
domenic Mar 29, 2019
206d65a
comma
domenic Apr 5, 2019
fb116af
e and f are translations
domenic Apr 5, 2019
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Expand Up @@ -56,7 +56,7 @@
.applies td { text-align: center; }

.matrix, .matrix td { border: hidden; text-align: right; }
.matrix { margin-left: 2em; }
.matrix, .equations { margin-left: 2em; }

.vertical-summary-table tr > th[rowspan="2"]:first-child + th,
.vertical-summary-table tr > td[rowspan="2"]:first-child + td { border-bottom: hidden; }
Expand Down Expand Up @@ -62716,6 +62716,37 @@ try {

</div>

<div class="note">
<p>Given a matrix of the form created by the <code
data-x="dom-context-2d-transform">transform()</code> and <code
data-x="dom-context-2d-setTransform">setTransform()</code> methods, i.e.</p>
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<table class="matrix">
<tr>
<td><var>a</var></td>
<td><var>c</var></td>
<td><var>e</var></td>
</tr>
<tr>
<td><var>b</var></td>
<td><var>d</var></td>
<td><var>f</var></td>
</tr>
<tr>
<td>0</td>
<td>0</td>
<td>1</td>
</tr>
</table>

<p>the resulting transformed coordinates after transform matrix multiplication will be</p>

<p class="equations">
<var>x</var><sub>new</sub> = <var>a</var> <var>x</var> + <var>c</var> <var>y</var><br>
<var>y</var><sub>new</sub> = <var>b</var> <var>x</var> + <var>d</var> <var>y</var>
</p>
</div>



<h6>Image sources for 2D rendering contexts</h6>
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