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position and the relative position of the label (above, below, to the left or right of the graduation) can be chosen. 'positionLabel' is a private method used by 'drawLabelsAndGraduations' and 'drawLabel' to determine the position of the label knowing the position of the graudation and its relative position
38 lines
1.5 KiB
C++
38 lines
1.5 KiB
C++
#include "trigonometry_graph_cell.h"
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using namespace Shared;
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using namespace Poincare;
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namespace Calculation {
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TrigonometryGraphView::TrigonometryGraphView(TrigonometryModel * model) :
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CurveView(model),
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m_model(model)
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{
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}
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void TrigonometryGraphView::drawRect(KDContext * ctx, KDRect rect) const {
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float s = std::sin(m_model->angle());
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float c = std::cos(m_model->angle());
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ctx->fillRect(rect, KDColorWhite);
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drawGrid(ctx, rect);
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drawAxes(ctx, rect);
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// Draw the circle
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drawCurve(ctx, rect, 0, 2.0f*M_PI, M_PI/180.0f, [](float t, void * model, void * context) {
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return Poincare::Coordinate2D<float>(std::cos(t), std::sin(t));
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}, nullptr, nullptr, true, Palette::GreyDark, false);
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// Draw dashed segment to indicate sine and cosine
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drawSegment(ctx, rect, Axis::Vertical, c, 0.0f, s, Palette::Red, 1, 3);
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drawSegment(ctx, rect, Axis::Horizontal, s, 0.0f, c, Palette::Red, 1, 3);
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// Draw angle position on the circle
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drawDot(ctx, rect, c, s, Palette::Red, true);
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// Draw graduations
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drawLabelsAndGraduations(ctx, rect, Axis::Vertical, false, true);
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drawLabelsAndGraduations(ctx, rect, Axis::Horizontal, false, true);
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// Draw labels
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drawLabel(ctx, rect, 0.0f, s, "sin(θ)", Palette::Red, c >= 0.0f ? CurveView::RelativePosition::Before : CurveView::RelativePosition::After, CurveView::RelativePosition::None);
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drawLabel(ctx, rect, c, 0.0f, "cos(θ)", Palette::Red, CurveView::RelativePosition::None, s >= 0.0f ? CurveView::RelativePosition::After : CurveView::RelativePosition::Before);
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}
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}
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