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[poincare/zoom] Helper method SetZoom

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Create a method SetZoom to zoom in and out on a window.
This commit is contained in:
Gabriel Ozouf
2020-12-09 10:18:17 +01:00
committed by EmilieNumworks
parent c28a5198d6
commit 71070ee052
3 changed files with 32 additions and 0 deletions
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1
poincare/include/poincare/zoom.h
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@@ -37,6 +37,7 @@ public:
/* If shrink is false, the range will be set to ratio by increasing the size
* of the smallest axis. If it is true, the longest axis will be reduced.*/
static void SetToRatio(float yxRatio, float * xMin, float * xMax, float * yMin, float * yMax, bool shrink = false);
static void SetZoom(float ratio, float xCenter, float yCenter, float * xMin, float * xMax, float * yMin, float * yMax);
private:
static constexpr int k_peakNumberOfPointsOfInterest = 3;

8
poincare/src/zoom.cpp
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@@ -421,6 +421,14 @@ void Zoom::SetToRatio(float yxRatio, float * xMin, float * xMax, float * yMin, f
*tMin = center - newRange / 2.f;
}
void Zoom::SetZoom(float ratio, float xCenter, float yCenter, float * xMin, float * xMax, float * yMin, float * yMax) {
float oneMinusRatio = 1.f - ratio;
*xMin = oneMinusRatio * xCenter + ratio * *xMin;
*xMax = oneMinusRatio * xCenter + ratio * *xMax;
*yMin = oneMinusRatio * yCenter + ratio * *yMin;
*yMax = oneMinusRatio * yCenter + ratio * *yMax;
}
bool Zoom::IsConvexAroundExtremum(ValueAtAbscissa evaluation, float x1, float x2, float x3, float y1, float y2, float y3, Context * context, const void * auxiliary, int iterations) {
if (iterations <= 0) {
return false;

23
poincare/test/zoom.cpp
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@@ -198,6 +198,12 @@ void assert_expands_to(float yxRatio, float xMin, float xMax, float yMin, float
assert_ratio_is_set_to(yxRatio, xMin, xMax, yMin, yMax, false, targetXMin, targetXMax, targetYMin, targetYMax);
}
void assert_zooms_to(float ratio, float xCenter, float yCenter, float xMin, float xMax, float yMin, float yMax, float targetXMin, float targetXMax, float targetYMin, float targetYMax) {
float tempXMin = xMin, tempXMax = xMax, tempYMin = yMin, tempYMax = yMax;
Zoom::SetZoom(ratio, xCenter, yCenter, &tempXMin, &tempXMax, &tempYMin, &tempYMax);
quiz_assert(ranges_match(tempXMin, tempXMax, tempYMin, tempYMax, targetXMin, targetXMax, targetYMin, targetYMax));
}
QUIZ_CASE(poincare_zoom_utility) {
// Ranges combinations
{
@@ -261,5 +267,22 @@ QUIZ_CASE(poincare_zoom_utility) {
assert_expands_to(1.33f,
-10, 10, -10, 10,
-10, 10, -13.3, 13.3);
// Zoom
assert_zooms_to(1.f, 0, 0,
-10, 10, -10, 10,
-10, 10, -10, 10);
assert_zooms_to(0.5f, 0, 0,
-10, 10, -5, 5,
-5, 5, -2.5, 2.5);
assert_zooms_to(3.f, 0, 0,
-10, 10, -5, 5,
-30, 30, -15, 15);
assert_zooms_to(1.5f, 10, 5,
-10, 10, -5, 5,
-20, 10, -10, 5);
assert_zooms_to(0.25f, 2, -2,
-10, 10, -5, 5,
-1, 4, -2.75, -0.25);
}