From 5205e71e5af7c8dc7b5256dee20ec0b5041132cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Tue, 6 Dec 2016 11:05:06 +0100
Subject: [PATCH] [apps/probability] Create a class law curve view inheriting
 from curve view

Change-Id: I3a6aacd3532c4eb9303b9970765e08f546850439
---
 apps/probability/Makefile           |  1 +
 apps/probability/law_curve_view.cpp | 33 +++++++++++++++++++++++++++++
 apps/probability/law_curve_view.h   | 25 ++++++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 apps/probability/law_curve_view.cpp
 create mode 100644 apps/probability/law_curve_view.h

diff --git a/apps/probability/Makefile b/apps/probability/Makefile
index 21188f7b6..ca0544659 100644
--- a/apps/probability/Makefile
+++ b/apps/probability/Makefile
@@ -4,6 +4,7 @@ app_objs += $(addprefix apps/probability/,\
   evaluate_context.o\
   law.o\
   law_controller.o\
+  law_curve_view.o\
   parameters_controller.o\
 )
 
diff --git a/apps/probability/law_curve_view.cpp b/apps/probability/law_curve_view.cpp
new file mode 100644
index 000000000..eed4a6a0b
--- /dev/null
+++ b/apps/probability/law_curve_view.cpp
@@ -0,0 +1,33 @@
+#include "law_curve_view.h"
+#include <assert.h>
+
+namespace Probability {
+
+LawCurveView::LawCurveView(Law * law) :
+  CurveView(),
+  m_law(law)
+{
+}
+
+void LawCurveView::drawRect(KDContext * ctx, KDRect rect) const {
+  ctx->fillRect(bounds(), KDColorWhite);
+  drawAxes(Axis::Horizontal, ctx, rect);
+  drawExpression(m_law->expression(), KDColorRed, ctx, rect);
+}
+
+float LawCurveView::min(Axis axis) const {
+  assert(axis == Axis::Horizontal || axis == Axis::Vertical);
+  return (axis == Axis::Horizontal ? m_law->xMin() : m_law->yMin());
+}
+
+float LawCurveView::max(Axis axis) const {
+  assert(axis == Axis::Horizontal || axis == Axis::Vertical);
+  return (axis == Axis::Horizontal ? m_law->xMax() : m_law->yMax());
+}
+
+float LawCurveView::evaluateExpressionAtAbscissa(Expression * expression, float abscissa) const {
+  m_law->evaluateContext()->setOverridenValueForSymbolT(abscissa);
+  return expression->approximate(*(m_law->evaluateContext()));
+}
+
+}
diff --git a/apps/probability/law_curve_view.h b/apps/probability/law_curve_view.h
new file mode 100644
index 000000000..031515f7f
--- /dev/null
+++ b/apps/probability/law_curve_view.h
@@ -0,0 +1,25 @@
+#ifndef PROBABILITY_LAW_CURVE_VIEW_H
+#define PROBABILITY_LAW_CURVE_VIEW_H
+
+#include "../curve_view.h"
+#include "law.h"
+#include <escher.h>
+#include <poincare.h>
+
+namespace Probability {
+
+class LawCurveView : public CurveView {
+public:
+  LawCurveView(Law * law);
+  void drawRect(KDContext * ctx, KDRect rect) const override;
+protected:
+  float min(Axis axis) const override;
+  float max(Axis axis) const override;
+private:
+  float evaluateExpressionAtAbscissa(Expression * expression, float abscissa) const override;
+  Law * m_law;
+};
+
+}
+
+#endif