[calculation] WIP: first version of ComplexListController

apps/calculation/additional_outputs/complex_graph_cell.cpp

@@ -0,0 +1,53 @@
+#include "complex_graph_cell.h"
+
+using namespace Shared;
+using namespace Poincare;
+
+namespace Calculation {
+
+ComplexGraphView::ComplexGraphView(ComplexModel * complexModel) :
+  CurveView(complexModel),
+  m_complex(complexModel)
+{
+}
+
+void ComplexGraphView::drawRect(KDContext * ctx, KDRect rect) const {
+  ctx->fillRect(rect, KDColorWhite);
+  float real = m_complex->real();
+  float imag = m_complex->imag();
+  /* Draw the partial ellipse indicating the angle theta
+   * - the ellipse parameters are a = real/2 and b = imag/2,
+   * - the ellipse equation is x^2/a^2 + y^2/b^2 = 1, so we draw the curve of
+   *   equation y = imag/real*(real*real/4-x*x)
+   * - we draw the ellipse from the dot (xStart, yStart) chosen so that
+   *   yStart = 0 which gives xStart = real/2 to the dot (xEnd, yEnd) chosen to
+   *   be on the slope y = x*imag/real which gives xStart = real/(2*sqrt(2)). */
+  drawCurve(ctx, rect, real/(2.0f*std::sqrt(2.0f)), real/2.0f, real/100.0f, [](float t, void * model, void * context) {
+      ComplexModel * complexModel = (ComplexModel *)model;
+      float real = complexModel->real();
+      float imag = complexModel->imag();
+      return Poincare::Coordinate2D<float>(t, (imag/real)*std::sqrt(real*real/4.0f - t*t));
+    }, m_complex, nullptr, false, Palette::GreyMiddle);
+  // Draw the seqgement from the origin to the dot (real, imag) of equation y = x*imag/real
+  drawCartesianCurve(ctx, rect, 0, real, [](float t, void * model, void * context) {
+        ComplexModel * complexModel = (ComplexModel *)model;
+        return Poincare::Coordinate2D<float>(t, t*complexModel->imag()/complexModel->real());
+      }, m_complex, nullptr, Palette::GreyMiddle);
+  drawAxes(ctx, rect);
+  drawDot(ctx, rect, real, imag, KDColorBlack);
+  drawLabel(ctx, rect, Axis::Horizontal, real);
+  drawLabel(ctx, rect, Axis::Vertical, imag);
+  drawAxisLabel(ctx, rect, Axis::Horizontal, "Re", real > 0.0f);
+  drawAxisLabel(ctx, rect, Axis::Vertical, "Im", imag > 0.0f);
+  char buffer[k_labelBufferMaxSize];
+  PrintFloat::ConvertFloatToText<float>(
+      std::arg(*m_complex),
+      buffer,
+      k_labelBufferMaxSize,
+      k_labelBufferMaxGlyphLength,
+      Poincare::Preferences::ShortNumberOfSignificantDigits,
+      Preferences::PrintFloatMode::Decimal);
+  ctx->drawString(buffer, KDPoint(floatToPixel(Axis::Horizontal, std::fabs(real)/2.0f)+KDFont::SmallFont->glyphSize().width(), floatToPixel(Axis::Vertical, 0.0f)-KDFont::SmallFont->glyphSize().height()), KDFont::SmallFont);
+}
+
+}