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add an example demonstrating how you can make custom dragable lines

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Max Thrun 2020-09-16 21:47:32 -07:00 committed by Max Thrun
parent 2ac10e73b0
commit 39328e1106
1 changed files with 32 additions and 0 deletions
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32
implot_demo.cpp
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@ -1218,6 +1218,38 @@ void ShowDemoWindow(bool* p_open) {
} }
} }
//------------------------------------------------------------------------- //-------------------------------------------------------------------------
if (ImGui::CollapsingHeader("Custom Dragable Lines")) {
static float line_value = 0.5f;
const float line_width = 3.0f;
const float grabbable_width = 5.0f;
if (ImPlot::BeginPlot("Dragable Lines")) {
auto x0 = ImPlot::GetPlotPos().x;
auto x1 = ImPlot::GetPlotPos().x + ImPlot::GetPlotSize().x;
auto y = ImPlot::PlotToPixels(0, line_value).y;
ImPlot::PushPlotClipRect();
ImPlot::GetPlotDrawList()->AddLine({ x0, y }, { x1, y }, IM_COL32_WHITE, line_width);
ImPlot::PopPlotClipRect();
ImVec2 old_cursor_pos = ImGui::GetCursorScreenPos();
ImVec2 new_cursor_pos = ImVec2(x0, y - grabbable_width / 2.0f);
ImGui::SetItemAllowOverlap();
ImGui::SetCursorScreenPos(new_cursor_pos);
ImGui::InvisibleButton("horizontal_line", ImVec2(x1 - x0, grabbable_width));
ImGui::SetCursorScreenPos(old_cursor_pos);
if (ImGui::IsItemHovered() || ImGui::IsItemActive()) {
ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNS);
}
if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0)) {
line_value = ImPlot::GetPlotMousePos().y;
}
ImPlot::EndPlot();
}
}
//-------------------------------------------------------------------------
ImGui::End(); ImGui::End();
} }