629f7686f3
The relative position in rel plugin is currently based on the world coordinate. So for the same effect, like fly in from the right-hand side, we must use different `data-rel-x/y/z` value. Why not let the plugin do the hard part? So I introduce a `data-rel-position`, when set to `relative`, all relative attribute is based on the position and rotation of previous slide. So no matter the rotation of previous slide, data-rel-x="1000" always looks like fly in from the right-hand side. We can change the position and rotation of one slide, and the position of all following slides will be changed too. When `data-rel-position` is set to `relative`, relative rotation has a clear meaning. It describes the relative rotations between slides. We don't need to set rotations for all slide, setting the key slides is enough. If `data-rel-position` is not relative, the effect of `data-rel-rotate-x/y/z` is not clear, so they're only used when `data-rel-position="relative"`. After the introduction of relative rotation, there're 6 attribute that will inherit from previous slide. If we want to set a relative X move, we have to set all other 5 attributes to 0. It's boring. So a `data-rel-clear` is used to set all 6 attributes to 0, and then the value specified in current slide is applied. The `examples/3D-positions/index.html` shows some usage. As you can see, the html code of two slide ring is the same, and slides except for the first two in a ring has no position attributes. It work by inheriting the previous one. This PR invokes a lot math calculations. Basically, the rotation of a slide is translated into the coordinate describing the directions of X/Y/Z axes. And `data-rel-x/y/z` can be easily calculated by that. The rotations is the hard part, I mainly use the algorithm in the Quaternions and spatial rotation - Wikipedia to compose two and more rotations. I'm not a math guy, hope I don't make much mistakes.
68 lines
2.7 KiB
HTML
68 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>The presentation steps used in an iframe in rel/padding_tests.js</title>
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<style type="text/css" media="screen">
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.step {
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position: relative;
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width: 500px;
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height: 500px;
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padding: 40px 60px;
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margin: 20px auto;
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box-sizing: border-box;
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line-height: 1.5;
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background-color: yellow;
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border-radius: 10px;
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box-shadow: 0 2px 6px rgba(0, 0, 0, .1);
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text-shadow: 0 2px 2px rgba(0, 0, 0, .1);
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font-family: 'Open Sans', Arial, sans-serif;
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font-size: 40pt;
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letter-spacing: -1px;
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border: solid 1px red;
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opacity: 50%;
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}
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</style>
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</head>
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<body class="impress-not-supported">
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<div id="impress">
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<div id="origin" class="step" data-rel-position="relative" data-x="0" data-y="0" data-z="0"></div>
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<div id="origin_x" class="step" data-rel-to="origin" data-rel-reset data-rel-x="500"></div>
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<div id="origin_y" class="step" data-rel-to="origin" data-rel-reset data-rel-y="500"></div>
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<div id="origin_z" class="step" data-rel-to="origin" data-rel-reset data-rel-z="500"></div>
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<div id="x" class="step" data-rel-reset="all" data-x="0" data-y="0" data-z="0" data-rotate-x="90"></div>
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<div id="x_x" class="step" data-rel-reset data-rel-to="x" data-rel-x="500"></div>
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<div id="x_y" class="step" data-rel-reset data-rel-to="x" data-rel-y="500"></div>
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<div id="x_z" class="step" data-rel-reset data-rel-to="x" data-rel-z="500"></div>
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<div id="y" class="step" data-rel-reset="all" data-x="0" data-y="0" data-z="0" data-rotate-y="90"></div>
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<div id="y_x" class="step" data-rel-reset data-rel-to="y" data-rel-x="500"></div>
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<div id="y_y" class="step" data-rel-reset data-rel-to="y" data-rel-y="500"></div>
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<div id="y_z" class="step" data-rel-reset data-rel-to="y" data-rel-z="500"></div>
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<div id="z" class="step" data-rel-reset="all" data-x="0" data-y="0" data-z="0" data-rotate-z="90"></div>
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<div id="z_x" class="step" data-rel-reset data-rel-to="z" data-rel-x="500"></div>
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<div id="z_y" class="step" data-rel-reset data-rel-to="z" data-rel-y="500"></div>
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<div id="z_z" class="step" data-rel-reset data-rel-to="z" data-rel-z="500"></div>
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<div id="reset" class="step" data-rel-reset="all" data-rel-x="100" data-rel-y="200" data-rel-z="300">
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by data prel-reset="all", paddings should be calculated as if data-rotate-*=0
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</div>
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<div id="overview" class="step overview" data-x="0" data-y="-1000" data-z="100" data-scale="4" data-rotate-x="45">
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</div>
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</div>
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<script src="../../../js/impress.js"></script>
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<!-- <script>impress().init();</script> -->
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</body>
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<html>
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