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a525c35ebb
The mantissas {1, 2, 5} used in CurveViewRange to compute the grid units
can be factored in Zoom.
Change-Id: I2bcc9b9df1ff6b6df82092a5d78ed3db132bf63a
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
#ifndef SHARED_CURVE_VIEW_RANGE_H
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#define SHARED_CURVE_VIEW_RANGE_H
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#include <stdint.h>
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#include <poincare/zoom.h>
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namespace Shared {
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class CurveViewRange {
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public:
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enum class Axis {
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X,
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Y
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};
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virtual uint32_t rangeChecksum();
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virtual float xMin() const = 0;
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virtual float xMax() const = 0;
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virtual float yMin() const = 0;
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virtual float yMax() const = 0;
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float xCenter() const { return (xMin() + xMax()) / 2; }
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float yCenter() const { return (yMin() + yMax()) / 2; }
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virtual float xGridUnit() const {
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return computeGridUnit(k_minNumberOfXGridUnits, k_maxNumberOfXGridUnits, xMax() - xMin());
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}
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virtual float yGridUnit() const {
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return computeGridUnit(k_minNumberOfYGridUnits, k_maxNumberOfYGridUnits, yMax() - yMin());
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}
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constexpr static float k_maxNumberOfXGridUnits = 18.0f;
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constexpr static float k_maxNumberOfYGridUnits = 13.0f;
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protected:
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constexpr static float k_minNumberOfXGridUnits = 7.0f;
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constexpr static float k_minNumberOfYGridUnits = 5.0f;
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private:
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/* The grid units is constrained to be a number of type: k*10^n with k = 1,2 or 5
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* and n a relative integer. The choice of x and y grid units depend on the
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* grid range.*/
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constexpr static float k_smallGridUnitMantissa = Poincare::Zoom::k_smallUnitMantissa;
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constexpr static float k_mediumGridUnitMantissa = Poincare::Zoom::k_mediumUnitMantissa;
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constexpr static float k_largeGridUnitMantissa = Poincare::Zoom::k_largeUnitMantissa;
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float computeGridUnit(float minNumberOfUnits, float maxNumberOfUnits, float range) const;
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};
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}
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#endif
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