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Merge pull request #159 from hexagonhexagon/better-mouse-drag

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Fix camera inertia problem with mouse movement
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tobspr 2020-06-22 12:34:34 +02:00 committed by GitHub
commit 3dca35ded4
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1 changed files with 24 additions and 0 deletions
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src/js/game/camera.js
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@ -28,6 +28,7 @@ const velocitySmoothing = 0.5;
const velocityFade = 0.98;
const velocityStrength = 0.4;
const velocityMax = 20;
const ticksBeforeErasingVelocity = 2;
/**
* @enum {string}
@ -58,6 +59,8 @@ export class Camera extends BasicSerializableObject {
// Input handling
this.currentlyMoving = false;
this.lastMovingPosition = null;
this.lastMovingPositionLastTick = null;
this.numTicksStandingStill = null;
this.cameraUpdateTimeBucket = 0.0;
this.didMoveSinceTouchStart = false;
this.currentlyPinching = false;
@ -667,6 +670,8 @@ export class Camera extends BasicSerializableObject {
this.touchPostMoveVelocity = new Vector(0, 0);
this.currentlyMoving = true;
this.lastMovingPosition = pos;
this.lastMovingPositionLastTick = null;
this.numTicksStandingStill = 0;
this.didMoveSinceTouchStart = false;
}
@ -716,6 +721,8 @@ export class Camera extends BasicSerializableObject {
this.currentlyMoving = false;
this.currentlyPinching = false;
this.lastMovingPosition = null;
this.lastMovingPositionLastTick = null;
this.numTicksStandingStill = 0;
this.lastPinchPositions = null;
this.userInteraction.dispatch(USER_INTERACT_TOUCHEND);
this.didMoveSinceTouchStart = false;
@ -813,6 +820,23 @@ export class Camera extends BasicSerializableObject {
this.touchPostMoveVelocity = this.touchPostMoveVelocity.multiplyScalar(velocityFade);
// Check if the camera is being dragged but standing still: if not, zero out `touchPostMoveVelocity`.
if (this.currentlyMoving && this.desiredCenter === null) {
if (
this.lastMovingPositionLastTick !== null &&
this.lastMovingPositionLastTick.equalsEpsilon(this.lastMovingPosition)
) {
this.numTicksStandingStill++;
} else {
this.numTicksStandingStill = 0;
}
this.lastMovingPositionLastTick = this.lastMovingPosition.copy();
if (this.numTicksStandingStill >= ticksBeforeErasingVelocity) {
this.touchPostMoveVelocity.x = 0;
this.touchPostMoveVelocity.y = 0;
}
}
// Check influence of past points
if (!this.currentlyMoving && !this.currentlyPinching) {
const len = this.touchPostMoveVelocity.length();