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Using PolyLine and drawing less points. #1

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Using PolyLine and drawing less points. #1

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de3c881
using PolyLine and drawing less points
clrnd Nov 17, 2017
349046a
nicer way to handle indices
clrnd Nov 17, 2017
87a10d4
typo
clrnd Nov 17, 2017
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19 changes: 14 additions & 5 deletions src/widgets.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -321,16 +321,25 @@ void renderBankGrid(const char *name, float height, int gridWidth, float *gridX,

// Draw lines
ImGui::PushClipRect(cellBox.Min, cellBox.Max, true);
ImVec2 lastPos;
for (int i = 0; i < WAVE_LEN; i++) {
// We only draw a fourth of the points plus the last one
int divisor = 4;
std::vector<ImVec2> points;
points.reserve(1 + WAVE_LEN/divisor);
for (int i = 0; i < WAVE_LEN; i += divisor) {
float value = currentBank.waves[j].postSamples[i];
float margin = 3.0;
ImVec2 pos = ImVec2(rescalef(i, 0, WAVE_LEN - 1, cellBox.Min.x, cellBox.Max.x), rescalef(value, 1.0, -1.0, cellBox.Min.y + margin, cellBox.Max.y - margin));
if (i > 0)
window->DrawList->AddLine(lastPos, pos, ImGui::GetColorU32(ImGuiCol_PlotLines));
lastPos = pos;
points.emplace_back(pos);
}

// last point
float value = currentBank.waves[j].postSamples[WAVE_LEN - 1];
float margin = 3.0;
ImVec2 pos = ImVec2(rescalef(WAVE_LEN - 1, 0, WAVE_LEN - 1, cellBox.Min.x, cellBox.Max.x), rescalef(value, 1.0, -1.0, cellBox.Min.y + margin, cellBox.Max.y - margin));
points.emplace_back(pos);
window->DrawList->AddPolyline(points.data(), 1 + WAVE_LEN/divisor, ImGui::GetColorU32(ImGuiCol_PlotLines), false, 1.0, false);


// Draw cell label
char label[64];
snprintf(label, sizeof(label), "%d", j);
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