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Internals: Added ImLineClosestPoint, ImTriangleClosestPoint helpers. Changing ImVec2 arg to const ImVec2&

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This commit is contained in:
omar 2017-07-31 21:11:41 +08:00
parent 1a26d0bc98
commit fb54dce71c
2 changed files with 39 additions and 5 deletions
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34
imgui.cpp
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@ -900,7 +900,21 @@ void ImGuiIO::AddInputCharactersUTF8(const char* utf8_chars)
#define IM_NEWLINE "\n"
#endif
bool ImTriangleContainsPoint(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p)
ImVec2 ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p)
{
ImVec2 ap = p - a;
ImVec2 ab_dir = b - a;
float ab_len = sqrtf(ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y);
ab_dir *= 1.0f / ab_len;
float dot = ap.x * ab_dir.x + ap.y * ab_dir.y;
if (dot < 0.0f)
return a;
if (dot > ab_len)
return b;
return a + ab_dir * dot;
}
bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p)
{
bool b1 = ((p.x - b.x) * (a.y - b.y) - (p.y - b.y) * (a.x - b.x)) < 0.0f;
bool b2 = ((p.x - c.x) * (b.y - c.y) - (p.y - c.y) * (b.x - c.x)) < 0.0f;
@ -908,7 +922,7 @@ bool ImTriangleContainsPoint(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p)
return ((b1 == b2) && (b2 == b3));
}
void ImTriangleBarycentricCoords(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p, float& out_u, float& out_v, float& out_w)
void ImTriangleBarycentricCoords(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p, float& out_u, float& out_v, float& out_w)
{
ImVec2 v0 = b - a;
ImVec2 v1 = c - a;
@ -919,6 +933,22 @@ void ImTriangleBarycentricCoords(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p, float&
out_u = 1.0f - out_v - out_w;
}
ImVec2 ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p)
{
ImVec2 proj_ab = ImLineClosestPoint(a, b, p);
ImVec2 proj_bc = ImLineClosestPoint(b, c, p);
ImVec2 proj_ca = ImLineClosestPoint(c, a, p);
float dist2_ab = ImLengthSqr(p - proj_ab);
float dist2_bc = ImLengthSqr(p - proj_bc);
float dist2_ca = ImLengthSqr(p - proj_ca);
float m = ImMin(dist2_ab, ImMin(dist2_bc, dist2_ca));
if (m == dist2_ab)
return proj_ab;
if (m == dist2_bc)
return proj_bc;
return proj_ca;
}
int ImStricmp(const char* str1, const char* str2)
{
int d;

10
imgui_internal.h
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@ -89,13 +89,17 @@ IMGUI_API int ImTextCountUtf8BytesFromStr(const ImWchar* in_text, cons
// Helpers: Misc
IMGUI_API ImU32 ImHash(const void* data, int data_size, ImU32 seed = 0); // Pass data_size==0 for zero-terminated strings
IMGUI_API void* ImFileLoadToMemory(const char* filename, const char* file_open_mode, int* out_file_size = NULL, int padding_bytes = 0);
IMGUI_API FILE* ImFileOpen(const char* filename, const char* file_open_mode);
IMGUI_API bool ImTriangleContainsPoint(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p);
IMGUI_API void ImTriangleBarycentricCoords(ImVec2 a, ImVec2 b, ImVec2 c, ImVec2 p, float& out_u, float& out_v, float& out_w);
IMGUI_API FILE* ImFileOpen(const char* filename, const char* file_open_mode);
static inline bool ImCharIsSpace(int c) { return c == ' ' || c == '\t' || c == 0x3000; }
static inline bool ImIsPowerOfTwo(int v) { return v != 0 && (v & (v - 1)) == 0; }
static inline int ImUpperPowerOfTwo(int v) { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; v++; return v; }
// Helpers: Geometry
IMGUI_API ImVec2 ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p);
IMGUI_API bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
IMGUI_API ImVec2 ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
IMGUI_API void ImTriangleBarycentricCoords(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p, float& out_u, float& out_v, float& out_w);
// Helpers: String
IMGUI_API int ImStricmp(const char* str1, const char* str2);
IMGUI_API int ImStrnicmp(const char* str1, const char* str2, int count);