Drezil/imgui
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Fixes to allow clean 1-pixel thick lines in more use cases. PixelCenterOffset not the same as previously!

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This commit is contained in:
ocornut
2014-08-28 14:52:10 +01:00
parent 1f63e01cc6
commit 88c33ecc29
4 changed files with 48 additions and 39 deletions
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77
imgui.cpp
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@@ -88,8 +88,8 @@
}
- if text or lines are blurry when integrating ImGui in your engine:
- try adjusting ImGui::GetIO().PixelCenterOffset to 0.0f or 0.5f
- in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
- try adjusting ImGui::GetIO().PixelCenterOffset to 0.5f or 0.375f
- some widgets carry state and requires an unique ID to do so.
- unique ID are typically derived from a string label, an indice or a pointer.
@@ -280,7 +280,7 @@ ImGuiIO::ImGuiIO()
LogFilename = "imgui_log.txt";
Font = NULL;
FontAllowScaling = false;
PixelCenterOffset = 0.5f;
PixelCenterOffset = 0.0f;
MousePos = ImVec2(-1,-1);
MousePosPrev = ImVec2(-1,-1);
MouseDoubleClickTime = 0.30f;
@@ -1560,8 +1560,10 @@ static void RenderFrame(ImVec2 p_min, ImVec2 p_max, ImU32 fill_col, bool border,
window->DrawList->AddRectFilled(p_min, p_max, fill_col, rounding);
if (border && (window->Flags & ImGuiWindowFlags_ShowBorders))
{
window->DrawList->AddRect(p_min+ImVec2(1,1), p_max+ImVec2(1,1), window->Color(ImGuiCol_BorderShadow), rounding);
window->DrawList->AddRect(p_min, p_max, window->Color(ImGuiCol_Border), rounding);
// FIXME: I have no idea how this is working correctly but it is the best I've found that works on multiple rendering
const float offset = GImGui.IO.PixelCenterOffset;
window->DrawList->AddRect(p_min+ImVec2(1.5f-offset,1.5f-offset), p_max+ImVec2(1.0f-offset*2,1.0f-offset*2), window->Color(ImGuiCol_BorderShadow), rounding);
window->DrawList->AddRect(p_min+ImVec2(0.5f-offset,0.5f-offset), p_max+ImVec2(0.0f-offset*2,0.0f-offset*2), window->Color(ImGuiCol_Border), rounding);
}
}
@@ -2768,20 +2770,21 @@ static bool CloseWindowButton(bool* open)
const ImGuiID id = window->GetID("##CLOSE");
const float size = window->TitleBarHeight() - 4.0f;
const ImGuiAabb bb(window->Aabb().GetTR() + ImVec2(-2.0f-size,2.0f), window->Aabb().GetTR() + ImVec2(-2.0f,2.0f+size));
const ImGuiAabb bb(window->Aabb().GetTR() + ImVec2(-3.0f-size,2.0f), window->Aabb().GetTR() + ImVec2(-3.0f,2.0f+size));
bool hovered, held;
bool pressed = ButtonBehaviour(bb, id, &hovered, &held, true);
// Render
const ImU32 col = window->Color((held && hovered) ? ImGuiCol_CloseButtonActive : hovered ? ImGuiCol_CloseButtonHovered : ImGuiCol_CloseButton);
window->DrawList->AddCircleFilled(bb.GetCenter(), ImMax(2.0f,size*0.5f-2.0f), col, 16);
const ImVec2 center = bb.GetCenter();
window->DrawList->AddCircleFilled(center, ImMax(2.0f,size*0.5f), col, 16);
const float cross_padding = 4.0f;
if (hovered && bb.GetWidth() >= (cross_padding+1)*2 && bb.GetHeight() >= (cross_padding+1)*2)
const float cross_extent = (size * 0.5f * 0.7071f) - 1.0f;
if (hovered)
{
window->DrawList->AddLine(bb.GetTL()+ImVec2(+cross_padding,+cross_padding), bb.GetBR()+ImVec2(-cross_padding,-cross_padding), window->Color(ImGuiCol_Text));
window->DrawList->AddLine(bb.GetBL()+ImVec2(+cross_padding,-cross_padding), bb.GetTR()+ImVec2(-cross_padding,+cross_padding), window->Color(ImGuiCol_Text));
window->DrawList->AddLine(center + ImVec2(+cross_extent,+cross_extent), center + ImVec2(-cross_extent,-cross_extent), window->Color(ImGuiCol_Text));
window->DrawList->AddLine(center + ImVec2(+cross_extent,-cross_extent), center + ImVec2(-cross_extent,+cross_extent), window->Color(ImGuiCol_Text));
}
if (open != NULL && pressed)
@@ -4815,16 +4818,18 @@ void ImDrawList::AddVtx(const ImVec2& pos, ImU32 col)
void ImDrawList::AddVtxLine(const ImVec2& a, const ImVec2& b, ImU32 col)
{
const ImVec2 n = (b - a) / ImLength(b - a);
const ImVec2 hn = ImVec2(n.y, -n.x) * 0.5f;
const float offset = GImGui.IO.PixelCenterOffset;
const ImVec2 hn = (b - a) * (0.50f / ImLength(b - a)); // half normal
const ImVec2 hp0 = ImVec2(offset - hn.y, offset + hn.x); // half perpendiculars + user offset
const ImVec2 hp1 = ImVec2(offset + hn.y, offset - hn.x);
AddVtx(a - hn, col);
AddVtx(b - hn, col);
AddVtx(a + hn, col);
AddVtx(b - hn, col);
AddVtx(b + hn, col);
AddVtx(a + hn, col);
// Two triangles makes up one line. Using triangles allows us to make draw calls.
AddVtx(a + hp0, col);
AddVtx(b + hp0, col);
AddVtx(a + hp1, col);
AddVtx(b + hp0, col);
AddVtx(b + hp1, col);
AddVtx(a + hp1, col);
}
void ImDrawList::AddLine(const ImVec2& a, const ImVec2& b, ImU32 col)
@@ -4966,10 +4971,12 @@ void ImDrawList::AddTriangleFilled(const ImVec2& a, const ImVec2& b, const ImVec
if ((col >> 24) == 0)
return;
const ImVec2 offset(GImGui.IO.PixelCenterOffset,GImGui.IO.PixelCenterOffset);
ReserveVertices(3);
AddVtx(a, col);
AddVtx(b, col);
AddVtx(c, col);
AddVtx(a + offset, col);
AddVtx(b + offset, col);
AddVtx(c + offset, col);
}
void ImDrawList::AddCircle(const ImVec2& centre, float radius, ImU32 col, int num_segments)
@@ -4977,13 +4984,15 @@ void ImDrawList::AddCircle(const ImVec2& centre, float radius, ImU32 col, int nu
if ((col >> 24) == 0)
return;
const ImVec2 offset(GImGui.IO.PixelCenterOffset,GImGui.IO.PixelCenterOffset);
ReserveVertices((unsigned int)num_segments*6);
const float a_step = 2*PI/(float)num_segments;
float a0 = 0.0f;
for (int i = 0; i < num_segments; i++)
{
const float a1 = (i + 1) == num_segments ? 0.0f : a0 + a_step;
AddVtxLine(centre + ImVec2(cos(a0),sin(a0))*radius, centre + ImVec2(cos(a1),sin(a1))*radius, col);
AddVtxLine(centre + offset + ImVec2(cos(a0),sin(a0))*radius, centre + ImVec2(cos(a1),sin(a1))*radius, col);
a0 = a1;
}
}
@@ -4993,15 +5002,17 @@ void ImDrawList::AddCircleFilled(const ImVec2& centre, float radius, ImU32 col,
if ((col >> 24) == 0)
return;
const ImVec2 offset(GImGui.IO.PixelCenterOffset,GImGui.IO.PixelCenterOffset);
ReserveVertices((unsigned int)num_segments*3);
const float a_step = 2*PI/(float)num_segments;
float a0 = 0.0f;
for (int i = 0; i < num_segments; i++)
{
const float a1 = (i + 1) == num_segments ? 0.0f : a0 + a_step;
AddVtx(centre + ImVec2(cos(a0),sin(a0))*radius, col);
AddVtx(centre + ImVec2(cos(a1),sin(a1))*radius, col);
AddVtx(centre, col);
AddVtx(centre + offset + ImVec2(cos(a0),sin(a0))*radius, col);
AddVtx(centre + offset + ImVec2(cos(a1),sin(a1))*radius, col);
AddVtx(centre + offset, col);
a0 = a1;
}
}
@@ -5231,13 +5242,11 @@ void ImBitmapFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& c
const float outline = (float)Info->Outline;
// Align to be pixel perfect
pos.x = (float)(int)pos.x + 0.5f;
pos.y = (float)(int)pos.y + 0.5f;
pos.x = (float)(int)pos.x;
pos.y = (float)(int)pos.y;
const ImVec4 clip_rect = clip_rect_ref;
const float uv_offset = GImGui.IO.PixelCenterOffset;
float x = pos.x;
float y = pos.y;
for (const char* s = text_begin; s < text_end; s++)
@@ -5274,10 +5283,10 @@ void ImBitmapFont::RenderText(float size, ImVec2 pos, ImU32 col, const ImVec4& c
continue;
}
const float s1 = (uv_offset + glyph->X) * tex_scale_x;
const float t1 = (uv_offset + glyph->Y) * tex_scale_y;
const float s2 = (uv_offset + glyph->X + glyph->Width) * tex_scale_x;
const float t2 = (uv_offset + glyph->Y + glyph->Height) * tex_scale_y;
const float s1 = (glyph->X) * tex_scale_x;
const float t1 = (glyph->Y) * tex_scale_y;
const float s2 = (glyph->X + glyph->Width) * tex_scale_x;
const float t2 = (glyph->Y + glyph->Height) * tex_scale_y;
out_vertices[0].pos = ImVec2(x1, y1);
out_vertices[0].uv = ImVec2(s1, t1);