feat(avatars): add avatar component (#156)

docs/avatars.stories.js

@@ -0,0 +1,20 @@
+import { storiesOf } from '@storybook/html'; // eslint-disable-line import/no-extraneous-dependencies
+import { // eslint-disable-line import/no-extraneous-dependencies
+  withKnobs, radios, boolean,
+} from '@storybook/addon-knobs';
+
+const stories = storiesOf('Avatars', module);
+stories.addDecorator(withKnobs);
+
+stories.add('avatars', () => {
+  const options = radios('class', {
+    'is-small': 'is-small',
+    default: '',
+    'is-medium': 'is-medium',
+    'is-large': 'is-large',
+  }, '');
+  const isRounded = boolean('is-rounded', false) ? 'is-rounded' : '';
+  const selectedClasses = [isRounded, options].join(' ');
+
+  return `<img src="http://www.gravatar.com/avatar" class="nes-avatar ${selectedClasses}">`;
+});

index.html

@@ -94,6 +94,20 @@
       </label>
     </section>
 
+    <section class="nes-container with-title">
+      <h2 class="title">Avatars</h2>
+      <div>
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-small">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-medium">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-large">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-small is-rounded">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-rounded">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-medium is-rounded">
+        <img src="http://www.gravatar.com/avatar" class="nes-avatar is-large is-rounded">
+      </div>
+    </section>
+
     <section class="form nes-container with-title">
       <h2 class="title">Form</h2>
       <div class="nes-field">

scss/elements/_index.scss

@@ -7,3 +7,4 @@
 @import "balloons.scss";
 @import "tables.scss";
 @import "progress.scss";
+@import "avatar.scss";

scss/elements/avatar.scss

@@ -0,0 +1,23 @@
+@mixin img-style($param) {
+  $size: $param * 16;
+
+  width: $size;
+  height: $size;
+
+  &.is-rounded {
+    border-radius: 50px;
+  }
+}
+.nes-avatar {
+  @include img-style(2px);
+
+  &.is-small {
+    @include img-style(1px);
+  }
+  &.is-medium {
+    @include img-style(3px);
+  }
+  &.is-large {
+    @include img-style(4px);
+  }
+}