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Add a normalized() function to a rectangle like in http://harmattan-dev.nokia.com/docs/library/html/qt4/qrectf.html#normalized.

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This function returns a normalized rectangle; i.e., a rectangle that has a non-negative width and height.
This commit is contained in:
mossroy 2013-10-21 13:57:09 +02:00
parent 21f6efa897
commit 99044f3a85
2 changed files with 52 additions and 0 deletions
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19
js/lib/geometry.js
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@ -389,6 +389,25 @@ define(function(require) {
this.width = decimals ? this.width.toFixed(decimals) : round(this.width); this.width = decimals ? this.width.toFixed(decimals) : round(this.width);
this.height = decimals ? this.height.toFixed(decimals) : round(this.height); this.height = decimals ? this.height.toFixed(decimals) : round(this.height);
return this; return this;
},
// Returns a normalized rectangle; i.e., a rectangle that has a non-negative width and height.
// If width < 0 the function swaps the left and right corners,
// and it swaps the top and bottom corners if height < 0
// like in http://harmattan-dev.nokia.com/docs/library/html/qt4/qrectf.html#normalized
normalized: function() {
var newx = this.x;
var newy = this.y;
var newwidth = this.width;
var newheight = this.height;
if (this.width < 0) {
newx = this.x + this.width;
newwidth = - this.width;
}
if (this.height < 0) {
newy = this.y + this.height;
newheight = - this.height;
}
return new rect(newx, newy, newwidth, newheight);
} }
}; };

33
tests/tests.js
View File

@ -212,5 +212,38 @@ define(function(require) {
ok(!rect1.containsPoint(point4), "rect1 does not contain point4"); ok(!rect1.containsPoint(point4), "rect1 does not contain point4");
ok(rect1.containsPoint(point5), "rect1 contains point5"); ok(rect1.containsPoint(point5), "rect1 contains point5");
}); });
test("check normalization of a rectangle", function() {
var rect1 = new geometry.rect(2,3,4,5);
var normalizedRect1 = rect1.normalized();
ok(rect1.x===normalizedRect1.x
&& rect1.y===normalizedRect1.y
&& rect1.width===normalizedRect1.width
&& rect1.height===normalizedRect1.height, "rect1 is the same after normalization");
var rect2 = new geometry.rect(6,3,-4,5);
var normalizedRect2 = rect2.normalized();
//alert("normalizedRect2 = " + normalizedRect2);
ok(normalizedRect2.x===2
&& normalizedRect2.y===3
&& normalizedRect2.width===4
&& normalizedRect2.height===5, "rect2 successfully normalized by switching top left and top right corners");
var rect3 = new geometry.rect(2,8,4,-5);
var normalizedRect3 = rect3.normalized();
ok(normalizedRect3.x===2
&& normalizedRect3.y===3
&& normalizedRect3.width===4
&& normalizedRect3.height===5, "rect3 successfully normalized by switching top left and botton left corners");
var rect4 = new geometry.rect(6,8,-4,-5);
var normalizedRect4 = rect4.normalized();
ok(normalizedRect4.x===2
&& normalizedRect4.y===3
&& normalizedRect4.width===4
&& normalizedRect4.height===5, "rect4 successfully normalized by switching bottom right and top left corners");
var rect5 = new geometry.rect(12,2,-4,-1);
var normalizedRect5 = rect5.normalized();
ok(normalizedRect5.x===8
&& normalizedRect5.y===1
&& normalizedRect5.width===4
&& normalizedRect5.height===1, "rect5 successfully normalized by switching bottom right and top left corners");
});
}; };
}); });