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Begin implementing webkit-gradient parsing

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This commit is contained in:
Niklas von Hertzen 2017-08-10 23:25:50 +08:00
parent eb380f023f
commit 5bd06895e9
1 changed files with 27 additions and 4 deletions
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31
src/Gradient.js
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@ -8,7 +8,9 @@ import Color from './Color';
import Length, {LENGTH_TYPE} from './Length';
const SIDE_OR_CORNER = /^(to )?(left|top|right|bottom)( (left|top|right|bottom))?$/i;
const PERCENTAGE_ANGLES = /^([+-]?\d*\.?\d+)% ([+-]?\d*\.?\d+)%$/i;
const ENDS_WITH_LENGTH = /(px)|%|( 0)$/i;
const FROM_TO = /^(from|to)\((.+)\)$/i;
export type Direction = {
x0: number,
@ -33,18 +35,32 @@ export const parseGradient = (
): ?Gradient => {
if (method === 'linear-gradient') {
return parseLinearGradient(args, bounds);
} else if (method === 'gradient' && args[0] === 'linear') {
// TODO handle correct angle
return parseLinearGradient(
['to bottom'].concat(
args
.slice(3)
.map(color => color.match(FROM_TO))
.filter(v => v !== null)
// $FlowFixMe
.map(v => v[2])
),
bounds
);
}
// TODO: webkit-gradient syntax
};
const parseLinearGradient = (args: Array<string>, bounds: Bounds): Gradient => {
const angle = parseAngle(args[0]);
const HAS_DIRECTION = SIDE_OR_CORNER.test(args[0]) || angle !== null;
const HAS_SIDE_OR_CORNER = SIDE_OR_CORNER.test(args[0]);
const HAS_DIRECTION = HAS_SIDE_OR_CORNER || angle !== null || PERCENTAGE_ANGLES.test(args[0]);
const direction = HAS_DIRECTION
? angle !== null
? calculateGradientDirection(angle, bounds)
: parseSideOrCorner(args[0], bounds)
: HAS_SIDE_OR_CORNER
? parseSideOrCorner(args[0], bounds)
: parsePercentageAngle(args[0], bounds)
: calculateGradientDirection(Math.PI, bounds);
const colorStops = [];
const firstColorStopIndex = HAS_DIRECTION ? 1 : 0;
@ -166,3 +182,10 @@ const parseSideOrCorner = (side: string, bounds: Bounds): Direction => {
return calculateGradientDirection(Math.PI, bounds);
}
};
const parsePercentageAngle = (angle: string, bounds: Bounds): Direction => {
const [left, top] = angle.split(' ').map(parseFloat);
const ratio = left / 100 * bounds.width / (top / 100 * bounds.height);
return calculateGradientDirection(Math.atan(isNaN(ratio) ? 1 : ratio) + Math.PI / 2, bounds);
};