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[python/turtle] Special case when goTo draws horizontal/vertical line

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This commit is contained in:
Léa Saviot
2019-02-05 17:34:19 +01:00
committed by EmilieNumworks
parent b5e278526f
commit 3faee8bcd8
1 changed files with 17 additions and 1 deletions
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18
python/port/mod/turtle/turtle.cpp
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@@ -7,7 +7,6 @@ extern "C" {
#include "../../helpers.h"
#include "../../port.h"
static inline mp_float_t maxF(mp_float_t x, mp_float_t y) { return x >= y ? x : y;}
static inline mp_float_t absF(mp_float_t x) { return x >= 0 ? x : -x;}
static constexpr KDCoordinate k_iconSize = 15;
@@ -45,6 +44,23 @@ void Turtle::reset() {
}
bool Turtle::forward(mp_float_t length) {
/* cos and sin use radians, we thus need to multiply m_heading by PI/180 to
* compute the new turtle position. This induces rounding errors that are
* really visible when one expects a horizontal/vertical line and it is not.
* We thus make special cases for angles in degrees creating vertical /
* horizontal lines. */
if (m_heading == 0) {
return goTo(m_x + length, m_y);
}
if (m_heading == 180 || m_heading == -180) {
return goTo(m_x - length, m_y);
}
if (m_heading == 90 || m_heading == -270) {
return goTo(m_x, m_y + length);
}
if (m_heading == 270 || m_heading == -90) {
return goTo(m_x, m_y - length);
}
return goTo(
m_x + length * std::cos(m_heading * k_headingScale),
m_y + length * std::sin(m_heading * k_headingScale)