Material Design

Shape

Shapes direct attention, identify components, communicate state, and express brand.

Currently shape system for web only supports rounded corners.

Design & API Documentation

Installation

npm install @material/shape

Basic Usage

Styles

@import "@material/shape/mixins";
@import "@material/shape/functions";

Style Customization

Sass Variables

Components are categorized as small, medium and large in shape system. Overriding below sass variables applies shape (rounded) to respective categories. For example, overriding $mdc-shape-medium-radius variable would apply shape to all components that belong to medium category.

Variable Description
$mdc-shape-small-component-radius Rounded shape radius size for small components. Default value 4px.
$mdc-shape-medium-component-radius Rounded shape radius size for medium components. Default value 4px.
$mdc-shape-large-component-radius Rounded shape radius size for large components. Default value 0.

Please refer Material Design guidelines: Shape to learn about how components are categorized.

Sass Mixins

Mixin Description
mdc-shape-radius($radius, $rtl-reflexive) Shape API used by all other components to apply radius to appropriate corners. $radius can be single value or list of up to 4 radius corner values. Set $rtl-reflexive to true to flip the radius in RTL case, false by default.

Use mdc-shape-resolve-percentage-radius sass function to resolve percentage unit value to absolute radius value.

Sass Functions

Function Description
mdc-shape-flip-radius($radius) Flips the radius values in RTL context. $radius is list of 2-4 corner values.
mdc-shape-resolve-percentage-radius($component-height, $radius) Calculates the absolute radius value based on its component height. Use this for fixed height components only.
mdc-shape-mask-radius($radius, $masked-corners) Accepts radius number or list of 2-4 radius values and returns 4 value list with masked corners as mentioned in $masked-corners.
mdc-shape-prop-value($radius) Returns $radius value of shape category - large, medium or small. Otherwise, it returns the $radius itself if valid. $radius can be a single value or list of up to 4.

Additional Information

Shapes for fixed height components

Styles for applying shape to a fixed height component such as button looks like this:

@include mdc-shape-radius(mdc-shape-resolve-percentage-radius($mdc-button-height, $radius));

Where, $mdc-button-height is the height of standard button and $radius is the size of shape. mdc-shape-resolve-percentage-radius function is used to resolve percentage unit value to absolute $radius value based on component height.

Shapes for dynamic height components

Styles for applying shapes to dynamic height component such as card looks like this:

@include mdc-shape-radius($radius);

Where, $radius is absolute value only.

Shapes for components on specific corners

Styles for applying shapes for specific corners such as drawer looks like this:

@include mdc-shape-radius(0 $radius $radius 0, $rtl-reflexive: true);

Where, only top-right & bottom-right corners are customizable and it automatically flips radius values based on RTL context when $rtl-reflexive is set to true.

Component theming

The styles for applying custom shape to button component instance looks like this:

@import "@material/button/mixins";

.my-custom-button {
  @include mdc-button-shape-radius(50%);
}

In this example, the above styles applies 50% (pill) shape to button. It can also be absolute value (e.g., 8px);

You would indirectly use the Shape API through respective component’s mixin which takes care of applying radius to applicable corners for all its variants.