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Texture-based thick lines: Improvements to code for drawing anti-aliased lines using textures

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Moved line width into a constant
Removed test code (now in imgui-tests)
Improved matching between geometry and texture rendering at non-integer sizes
This commit is contained in:
Ben Carter
2020-01-15 16:33:09 +09:00
committed by omar
parent 1d3c3070d8
commit 741ab74b55
4 changed files with 8 additions and 66 deletions
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56
imgui_demo.cpp
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@ -297,62 +297,6 @@ void ImGui::ShowDemoWindow(bool* p_open)
ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiCond_FirstUseEver);
ImGui::SetNextWindowSize(ImVec2(550, 680), ImGuiCond_FirstUseEver);
// Test lines
if (ImGui::Begin("Lines"))
{
ImDrawList* draw_list = ImGui::GetWindowDrawList();
const int num_cols = 16;
const int num_rows = 3;
const float line_len = 64.0f;
const float line_spacing = 128.0f;
static float base_rot = 0.0f;
ImGui::SliderFloat("Base rotation", &base_rot, 0.0f, 360.0f);
static float line_width = 1.0f;
ImGui::SliderFloat("Line width", &line_width, 1.0f, 10.0f);
ImVec2 window_pos = ImGui::GetWindowPos();
ImVec2 cursor_pos = ImGui::GetCursorPos();
ImVec2 base_pos(window_pos.x + cursor_pos.x + (line_spacing * 0.5f), window_pos.y + cursor_pos.y);
for (int i = 0; i < num_rows; i++)
{
const char* name = "";
switch (i)
{
case 0: name = "No AA"; draw_list->Flags &= ~ImDrawListFlags_AntiAliasedLines; break;
case 1: name = "AA no texturing"; draw_list->Flags |= ImDrawListFlags_AntiAliasedLines; draw_list->Flags &= ~ImDrawListFlags_TexturedAALines; break;
case 2: name = "AA with texturing"; draw_list->Flags |= ImDrawListFlags_AntiAliasedLines; draw_list->Flags |= ImDrawListFlags_TexturedAALines; break;
}
int initial_vtx_count = draw_list->VtxBuffer.Size;
int initial_idx_count = draw_list->IdxBuffer.Size;
for (int j = 0; j < num_cols; j++)
{
const float pi = 3.14159265359f;
float r = (base_rot * pi / 180.0f) + ((j * pi * 0.5f) / (num_cols - 1));
ImVec2 center = ImVec2(base_pos.x + (line_spacing * (j * 0.5f)), base_pos.y + (line_spacing * (i + 0.5f)));
ImVec2 start = ImVec2(center.x + (sinf(r) * line_len * 0.5f), center.y + (cosf(r) * line_len * 0.5f));
ImVec2 end = ImVec2(center.x - (sinf(r) * line_len * 0.5f), center.y - (cosf(r) * line_len * 0.5f));
draw_list->AddLine(start, end, IM_COL32(255, 255, 255, 255), line_width);
}
ImGui::SetCursorPosY(cursor_pos.y + (i * line_spacing));
ImGui::Text("%s - %d vertices, %d indices", name, draw_list->VtxBuffer.Size - initial_vtx_count, draw_list->IdxBuffer.Size - initial_idx_count);
}
ImGui::SetCursorPosY(cursor_pos.y + (num_rows * line_spacing));
//ImGui::Spacing(); ImGui::Spacing(); ImGui::Spacing();
//ImGui::Image(ImGui::GetFont()->ContainerAtlas->TexID, ImVec2((float)ImGui::GetFont()->ContainerAtlas->TexWidth, (float)ImGui::GetFont()->ContainerAtlas->TexHeight));
}
ImGui::End();
// Main body of the Demo window starts here.
if (!ImGui::Begin("Dear ImGui Demo", p_open, window_flags))
{