Fixed deltaPoints always 0 bug

[zhangjindong]

Fixed deltaPoints always 0 bug

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Bug fix

• What is the current behavior? (You can also link to an open issue here)

I don't think currentPoints and lastPoints will be different when the mouse moves. I get deltaPoints. Image always {x:0,y:0}.

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

Such as:

constructor(props = {}) {
    ...
    this.updateOnMouseMove = true;
    ...
}

// When I move the mouse quickly, I need to decide whether to hide when I reach the boundary.
mouseMoveCallback(evt) {
    const { element, currentPoints, image, deltaPoints } = evt.detail;
    const borderDistance = 30;
    const imageRect = {
    left: 0 + borderDistance - deltaPoints.image.x * 2,
    top: 0 + borderDistance - deltaPoints.image.y * 2,
    width: image.width - borderDistance * 2 - deltaPoints.image.x * 2,
    height: image.height - borderDistance * 2 - deltaPoints.image.y * 2,
    };
    ...
        const outside = cornerstoneMath.point.insideRect(data.handles.end, imageRect) === false;
        data.visible = ! outside;
    ...
}

• Other information:

[codecov]

Codecov Report

Merging #1471 (c216a33) into master (95c3b7c) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1471      +/-   ##
==========================================
- Coverage   20.16%   20.16%   -0.01%     
==========================================
  Files         287      287              
  Lines       10102    10103       +1     
  Branches     2060     2060              
==========================================
  Hits         2037     2037              
- Misses       6852     6853       +1     
  Partials     1213     1213              

Impacted Files	Coverage Δ
src/eventListeners/mouseEventListeners.js	3.84% <0.00%> (-0.04%)	⬇️

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