diff options
Diffstat (limited to 'src/client/util/InteractionUtils.ts')
| -rw-r--r-- | src/client/util/InteractionUtils.ts | 51 |
1 files changed, 25 insertions, 26 deletions
diff --git a/src/client/util/InteractionUtils.ts b/src/client/util/InteractionUtils.ts index 2d3671041..2e4e8c7ca 100644 --- a/src/client/util/InteractionUtils.ts +++ b/src/client/util/InteractionUtils.ts @@ -9,9 +9,9 @@ export namespace InteractionUtils { const ERASER_BUTTON = 5; export function GetMyTargetTouches(e: TouchEvent | React.TouchEvent, prevPoints: Map<number, React.Touch>): React.Touch[] { - let myTouches = new Array<React.Touch>(); + const myTouches = new Array<React.Touch>(); for (let i = 0; i < e.targetTouches.length; i++) { - let pt = e.targetTouches.item(i); + const pt = e.targetTouches.item(i); if (pt && prevPoints.has(pt.identifier)) { myTouches.push(pt); } @@ -40,8 +40,8 @@ export namespace InteractionUtils { * @param pts - n-arbitrary long list of points */ export function CenterPoint(pts: React.Touch[]): { X: number, Y: number } { - let centerX = pts.map(pt => pt.clientX).reduce((a, b) => a + b, 0) / pts.length; - let centerY = pts.map(pt => pt.clientY).reduce((a, b) => a + b, 0) / pts.length; + const centerX = pts.map(pt => pt.clientX).reduce((a, b) => a + b, 0) / pts.length; + const centerY = pts.map(pt => pt.clientY).reduce((a, b) => a + b, 0) / pts.length; return { X: centerX, Y: centerY }; } @@ -53,9 +53,9 @@ export namespace InteractionUtils { * @param oldPoint2 - previous point 2 */ export function Pinching(pt1: React.Touch, pt2: React.Touch, oldPoint1: React.Touch, oldPoint2: React.Touch): number { - let threshold = window.devicePixelRatio; - let oldDist = TwoPointEuclidist(oldPoint1, oldPoint2); - let newDist = TwoPointEuclidist(pt1, pt2); + const threshold = 4; + const oldDist = TwoPointEuclidist(oldPoint1, oldPoint2); + const newDist = TwoPointEuclidist(pt1, pt2); /** if they have the same sign, then we are either pinching in or out. * threshold it by 10 (it has to be pinching by at least threshold to be a valid pinch) @@ -75,12 +75,12 @@ export namespace InteractionUtils { * @param oldPoint2 - previous point 2 */ export function Pinning(pt1: React.Touch, pt2: React.Touch, oldPoint1: React.Touch, oldPoint2: React.Touch): number { - let threshold = 4; + const threshold = 4; - let pt1Dist = TwoPointEuclidist(oldPoint1, pt1); - let pt2Dist = TwoPointEuclidist(oldPoint2, pt2); + const pt1Dist = TwoPointEuclidist(oldPoint1, pt1); + const pt2Dist = TwoPointEuclidist(oldPoint2, pt2); - let pinching = Pinching(pt1, pt2, oldPoint1, oldPoint2); + const pinching = Pinching(pt1, pt2, oldPoint1, oldPoint2); if (pinching !== 0) { if ((pt1Dist < threshold && pt2Dist > threshold) || (pt1Dist > threshold && pt2Dist < threshold)) { @@ -90,6 +90,20 @@ export namespace InteractionUtils { return 0; } + export function IsDragging(oldTouches: Map<number, React.Touch>, newTouches: React.Touch[], leniency: number): boolean { + for (const touch of newTouches) { + if (touch) { + const oldTouch = oldTouches.get(touch.identifier); + if (oldTouch) { + if (TwoPointEuclidist(touch, oldTouch) >= leniency) { + return true; + } + } + } + } + return false; + } + // These might not be very useful anymore, but I'll leave them here for now -syip2 { @@ -145,20 +159,5 @@ export namespace InteractionUtils { // return { type: undefined }; // } // } - - // export function IsDragging(oldTouches: Map<number, React.Touch>, newTouches: TouchList, leniency: number): boolean { - // for (let i = 0; i < newTouches.length; i++) { - // let touch = newTouches.item(i); - // if (touch) { - // let oldTouch = oldTouches.get(touch.identifier); - // if (oldTouch) { - // if (TwoPointEuclidist(touch, oldTouch) >= leniency) { - // return true; - // } - // } - // } - // } - // return false; - // } } }
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