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HexTile cleanup

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This commit is contained in:
Josh Holtrop 2012-09-11 19:18:43 -04:00
parent 46c9a81c11
commit aa52be8801
1 changed files with 5 additions and 15 deletions
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20
src/common/HexTile.cc
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@ -7,16 +7,6 @@
#define COS_120 (-0.5f) #define COS_120 (-0.5f)
#define SIN_120 SIN_60 #define SIN_120 SIN_60
/* points of a horizontal hexagon 2.0 units high */
static const float hex_points[][2] = {
{HEX_WIDTH_TO_HEIGHT, 0.0},
{HEX_WIDTH_TO_HEIGHT / 2.0, 1.0},
{-HEX_WIDTH_TO_HEIGHT / 2.0, 1.0},
{-HEX_WIDTH_TO_HEIGHT, 0.0},
{-HEX_WIDTH_TO_HEIGHT / 2.0, -1.0},
{HEX_WIDTH_TO_HEIGHT / 2.0, -1.0}
};
HexTile::HexTile(float x, float y, float size) HexTile::HexTile(float x, float y, float size)
{ {
m_x = x; m_x = x;
@ -26,8 +16,8 @@ HexTile::HexTile(float x, float y, float size)
bool HexTile::point_within(float x, float y) bool HexTile::point_within(float x, float y)
{ {
x = 2.0 * (x - m_x) / m_size; x = 2.0 * (x - m_x);
y = 2.0 * (y - m_y) / m_size; y = 2.0 * (y - m_y);
/* a point (x, y) at angle q rotates to (x', y') by f deg around the origin /* a point (x, y) at angle q rotates to (x', y') by f deg around the origin
* according to: * according to:
* x' = r*cos(q+f) = r*cos(q)*cos(f)-r*sin(q)*sin(f) * x' = r*cos(q+f) = r*cos(q)*cos(f)-r*sin(q)*sin(f)
@ -40,13 +30,13 @@ bool HexTile::point_within(float x, float y)
* x' = x * 0.5 - y * 0.8660254 * x' = x * 0.5 - y * 0.8660254
* y' = y * 0.5 + x * 0.8660254 * y' = y * 0.5 + x * 0.8660254
*/ */
if (fabsf(y) > 1.0) if (fabsf(y) > m_size)
return false; return false;
float y_60 = y * COS_60 + x * SIN_60; float y_60 = y * COS_60 + x * SIN_60;
if (fabsf(y_60) > 1.0) if (fabsf(y_60) > m_size)
return false; return false;
float y_120 = y * COS_120 + x * SIN_120; float y_120 = y * COS_120 + x * SIN_120;
if (fabsf(y_120) > 1.0) if (fabsf(y_120) > m_size)
return false; return false;
return true; return true;
} }