Created
March 6, 2020 19:18
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Example CoordinatesArray subclass
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| class RouteCoordinatesArray extends Animated.CoordinatesArray { | |
| newCoordAnimator(config, origCoords) { | |
| const {along} = config; | |
| return { | |
| dist: along[0], | |
| distconf: along[1], | |
| calculate(progress, coords) { | |
| const currentDist = progress * this.dist; | |
| let prevsum = 0; | |
| let actsum = 0; | |
| let i = origCoords.length - 1; | |
| while (actsum < currentDist && i > 0) { | |
| prevsum = actsum; | |
| actsum += distance( | |
| point(coords[i]), | |
| point(coords[i - 1]), | |
| this.distconf, | |
| ); | |
| i -= 1; | |
| } | |
| if (actsum <= currentDist) { | |
| return [coords[0]]; | |
| } | |
| const r = (currentDist - prevsum) / (actsum - prevsum); | |
| const or = 1.0 - r; | |
| return [ | |
| ...coords.slice(0, i + 1), | |
| [ | |
| coords[i][0] * r + coords[i + 1][0] * or, | |
| coords[i][1] * r + coords[i + 1][1] * or, | |
| ], | |
| ]; | |
| }, | |
| }; | |
| } | |
| } |
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