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[shared] Create helper functions for ranges

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These functions are used to test the full algorithm used to compute
ranges.

Change-Id: I48069e245aa6e879f66aecc29709fc6f992f5220
This commit is contained in:
Gabriel Ozouf
2020-11-26 15:01:08 +01:00
committed by LeaNumworks
parent 1e7babadb8
commit a9aeae94df
4 changed files with 66 additions and 46 deletions
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27
apps/shared/interactive_curve_view_controller.cpp
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@@ -41,32 +41,7 @@ InteractiveCurveViewController::InteractiveCurveViewController(Responder * paren
}
float InteractiveCurveViewController::addMargin(float y, float range, bool isVertical, bool isMin) {
/* The provided min or max range limit y is altered by adding a margin.
* In pixels, the view's height occupied by the vertical range is equal to
* viewHeight - topMargin - bottomMargin.
* Hence one pixel must correspond to
* range / (viewHeight - topMargin - bottomMargin).
* Finally, adding topMargin pixels of margin, say at the top, comes down
* to adding
* range * topMargin / (viewHeight - topMargin - bottomMargin)
* which is equal to
* range * topMarginRatio / ( 1 - topMarginRatio - bottomMarginRatio)
* where
* topMarginRation = topMargin / viewHeight
* bottomMarginRatio = bottomMargin / viewHeight.
* The same goes horizontally.
*/
float topMarginRatio = isVertical ? cursorTopMarginRatio() : cursorRightMarginRatio();
float bottomMarginRatio = isVertical ? cursorBottomMarginRatio() : cursorLeftMarginRatio();
assert(topMarginRatio + bottomMarginRatio < 1); // Assertion so that the formula is correct
float ratioDenominator = 1 - bottomMarginRatio - topMarginRatio;
float ratio = isMin ? -bottomMarginRatio : topMarginRatio;
/* We want to add slightly more than the required margin, so that
* InteractiveCurveViewRange::panToMakePointVisible does not think a point is
* invisible due to precision problems when checking if it is outside the
* required margin. This is why we add a 1.05f factor. */
ratio = 1.05f * ratio / ratioDenominator;
return y + ratio * range;
return AddMarginHelper(y, range, isVertical, isMin, cursorTopMarginRatio(), cursorBottomMarginRatio(), cursorLeftMarginRatio(), cursorRightMarginRatio());
}
void InteractiveCurveViewController::updateZoomButtons() {