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Updated Tips (markdown)

omar 2015-11-15 22:49:30 +01:00
parent 7545642056
commit f7a723f665
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Tips.md

@ -13,3 +13,41 @@ ImGui::BeginChild("##scrolling");
ImGui::SetScrollFromPosY(ImGui::GetCursorStartPos().y + (goto_addr / Rows) * line_height);
ImGui::End();
```
**Tip: use Stride for easily plotting a field in array of structures**<br>
https://github.com/ocornut/imgui/issues/271
Here I've got some code sampling joints of an animation as e.g 60 hz.
And I can plot that directly from the joint structure without copying the data around one more time
```cpp
int stride = skel.getBoneCount() * sizeof(JointTransform);
ImGui::PlotLines("RightFoot y", &all_sampled_joints[skel.getBoneIndex("RightFoot")].translation.y, samples, 0, NULL, FLT_MAX, FLT_MAX, ImVec2(0,0), stride);
ImGui::PlotLines("RightToeBase y", &all_sampled_joints[skel.getBoneIndex("RightToeBase")].translation.y, samples, 0, NULL, FLT_MAX, FLT_MAX, ImVec2(0,0), stride);
ImGui::PlotLines("LeftFoot y", &all_sampled_joints[skel.getBoneIndex("LeftFoot")].translation.y, samples, 0, NULL, FLT_MAX, FLT_MAX, ImVec2(0,0), stride);
ImGui::PlotLines("LeftToeBase y", &all_sampled_joints[skel.getBoneIndex("LeftToeBase")].translation.y, samples, 0, NULL, FLT_MAX, FLT_MAX, ImVec2(0,0), stride);
```
![footsteps](https://cloud.githubusercontent.com/assets/8225057/8634511/66076f8e-27b8-11e5-9964-202bf4305802.PNG)
**Tip: use c++11 lambas with Combo/ListBox/Plot functions**
```cpp
void SelectBoneByName(const char* label, int* bone_idx, const Skeleton* skeleton)
{
ImGui::Combo(label, bone_idx,
[](void* data, int idx, const char** out_text) { *out_text = skeleton->GetBoneName(idx); return *out_text != NULL; },
(void*)skeleton, skeleton->GetBoneCount());
}
```
```cpp
ImGui::PlotLines("Sin", [](void*data, int idx) { return sinf(idx*0.2f); }, NULL, 100);
ImGui::PlotLines("Cos", [](void*data, int idx) { return cosf(idx*0.2f); }, NULL, 100);
```
![plot func](https://cloud.githubusercontent.com/assets/8225057/8634531/b3281cd6-27b9-11e5-8bf8-ec9f1c67e866.PNG)
Bit awkward with sample indices to plot an actual math function. Ideally here we could introduce variants of plot that use all floats. Will probably add something.
Likewise for combo boxes, don't copy data around creating list of strings! Use a function to retrieve your data from whatever format it is naturally. The whole plot API is a little awkward and could be reworked along with adding some form of iterator scheme for sparse combo / list-box.