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#include "image_view.h"
#include "imgui/imgui_image.h"
#include "core/style.h"
#include "imgui/imgui_internal.h"
#include "imgui/implot/implot.h"
#include "imgui/implot/implot_internal.h"
#include "logger.h"
ImageViewWidget::ImageViewWidget()
{
static int id_num = 0;
id_str = "imgview_" + std::to_string(id_num);
id_num++;
}
ImageViewWidget::~ImageViewWidget()
{
}
void ImageViewWidget::update(image::Image &image)
{
image_mtx.lock();
if (image.width() == 0 || image.height() == 0)
{
img_chunks.resize(0);
}
else if (image.width() <= maxTextureSize && image.height() <= maxTextureSize)
{
img_chunks.resize(1);
fimg_width = img_chunks[0].img_width = image.width();
fimg_height = img_chunks[0].img_height = image.height();
img_chunks[0].texture_buffer.resize(img_chunks[0].img_width * img_chunks[0].img_height);
image::image_to_rgba(image, img_chunks[0].texture_buffer.data());
}
else
{
logger->trace("Mouse tooltip might have an issue here! (TODO)");
fimg_width = image.width();
fimg_height = image.height();
int chunksx = fimg_width / (maxTextureSize / 2);
int chunksy = fimg_height / (maxTextureSize / 2);
if (chunksx == 0)
chunksx = 1;
if (chunksy == 0)
chunksy = 1;
img_chunks.resize(chunksx * chunksy);
for (int ix = 0; ix < chunksx; ix++)
{
for (int iy = 0; iy < chunksy; iy++)
{
int i = iy * chunksx + ix;
int height_start = ((double)iy / (double)chunksy) * (double)fimg_height;
int height_end = (((double)iy + 1.0) / (double)chunksy) * (double)fimg_height;
int width_start = ((double)ix / (double)chunksx) * (double)fimg_width;
int width_end = (((double)ix + 1.0) / (double)chunksx) * (double)fimg_width;
img_chunks[i].img_width = width_end - width_start;
img_chunks[i].img_height = height_end - height_start;
img_chunks[i].texture_buffer.resize(img_chunks[i].img_width * img_chunks[i].img_height);
auto crop = image.crop_to(width_start, height_start, width_end, height_end);
image::image_to_rgba(crop, img_chunks[i].texture_buffer.data());
img_chunks[i].offset_x = width_start;
img_chunks[i].offset_y = fimg_height - height_start;
}
}
}
has_to_update = true;
image_mtx.unlock();
}
inline void addPlotScroll(ImPlotPlot &plot, float wheel_scroll)
{
ImPlotContext &gp = *ImPlot::GetCurrentContext();
const bool axis_equal = ImHasFlag(plot.Flags, ImPlotFlags_Equal);
float zoom_rate = gp.InputMap.ZoomRate;
if (wheel_scroll == 0.0f)
zoom_rate = 0;
else if (wheel_scroll > 0)
zoom_rate = (-zoom_rate) / (1.0f + (2.0f * zoom_rate));
ImVec2 rect_size = plot.PlotRect.GetSize();
float tx = ImRemap(plot.PlotRect.Max.x - plot.PlotRect.Min.x, plot.PlotRect.Min.x, plot.PlotRect.Max.x, 0.0f, 1.0f);
float ty = ImRemap(plot.PlotRect.Max.y - plot.PlotRect.Min.y, plot.PlotRect.Min.y, plot.PlotRect.Max.y, 0.0f, 1.0f);
for (int i = 0; i < IMPLOT_NUM_X_AXES; i++)
{
ImPlotAxis &x_axis = plot.XAxis(i);
const bool equal_zoom = axis_equal && x_axis.OrthoAxis != nullptr;
const bool equal_locked = (equal_zoom != false) && x_axis.OrthoAxis->IsInputLocked();
if (!x_axis.IsInputLocked() && !equal_locked)
{
ImGui::SetKeyOwner(ImGuiKey_MouseWheelY, plot.ID);
if (zoom_rate != 0.0f)
{
float correction = (plot.Hovered && equal_zoom) ? 0.5f : 1.0f;
const double plot_l = x_axis.PixelsToPlot(plot.PlotRect.Min.x - rect_size.x * tx * zoom_rate * correction);
const double plot_r = x_axis.PixelsToPlot(plot.PlotRect.Max.x + rect_size.x * (1 - tx) * zoom_rate * correction);
x_axis.SetMin(x_axis.IsInverted() ? plot_r : plot_l);
x_axis.SetMax(x_axis.IsInverted() ? plot_l : plot_r);
if (axis_equal && x_axis.OrthoAxis != nullptr)
x_axis.OrthoAxis->SetAspect(x_axis.GetAspect());
}
}
}
for (int i = 0; i < IMPLOT_NUM_Y_AXES; i++)
{
ImPlotAxis &y_axis = plot.YAxis(i);
const bool equal_zoom = axis_equal && y_axis.OrthoAxis != nullptr;
const bool equal_locked = equal_zoom && y_axis.OrthoAxis->IsInputLocked();
if (!y_axis.IsInputLocked() && !equal_locked)
{
ImGui::SetKeyOwner(ImGuiKey_MouseWheelY, plot.ID);
if (zoom_rate != 0.0f)
{
float correction = (plot.Hovered && equal_zoom) ? 0.5f : 1.0f;
const double plot_t = y_axis.PixelsToPlot(plot.PlotRect.Min.y - rect_size.y * ty * zoom_rate * correction);
const double plot_b = y_axis.PixelsToPlot(plot.PlotRect.Max.y + rect_size.y * (1 - ty) * zoom_rate * correction);
y_axis.SetMin(y_axis.IsInverted() ? plot_t : plot_b);
y_axis.SetMax(y_axis.IsInverted() ? plot_b : plot_t);
if (axis_equal && y_axis.OrthoAxis != nullptr)
y_axis.OrthoAxis->SetAspect(y_axis.GetAspect());
}
}
}
}
void ImageViewWidget::draw(ImVec2 win_size)
{
image_mtx.lock();
for (auto &chunk : img_chunks)
if (chunk.texture_id == 0)
chunk.texture_id = makeImageTexture();
if (has_to_update)
{
for (auto &chunk : img_chunks)
{
updateMMImageTexture(chunk.texture_id, chunk.texture_buffer.data(), chunk.img_width, chunk.img_height);
chunk.texture_buffer.clear();
}
has_to_update = false;
}
ImGui::BeginChild(id_str.c_str(), win_size, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse);
if (img_chunks.size() > 0)
{
ImPlot::PushStyleVar(ImPlotStyleVar_PlotPadding, ImVec2(0, 0));
ImPlot::PushStyleVar(ImPlotStyleVar_PlotBorderSize, 0.0f);
if (ImPlot::BeginPlot((id_str + "plot").c_str(), ImVec2(win_size.x, win_size.y - 16 * ui_scale), ImPlotFlags_NoLegend | ImPlotFlags_NoTitle | ImPlotFlags_CanvasOnly | ImPlotFlags_Equal))
{
if (autoFitNextFrame)
{
ImPlot::SetupAxes(nullptr, nullptr,
ImPlotAxisFlags_NoTickMarks | ImPlotAxisFlags_NoTickLabels | ImPlotAxisFlags_NoGridLines | ImPlotAxisFlags_AutoFit,
ImPlotAxisFlags_NoTickMarks | ImPlotAxisFlags_NoTickLabels | ImPlotAxisFlags_NoGridLines | ImPlotAxisFlags_AutoFit);
autoFitNextFrame = false;
}
else
ImPlot::SetupAxes(nullptr, nullptr,
ImPlotAxisFlags_NoTickMarks | ImPlotAxisFlags_NoTickLabels | ImPlotAxisFlags_NoGridLines,
ImPlotAxisFlags_NoTickMarks | ImPlotAxisFlags_NoTickLabels | ImPlotAxisFlags_NoGridLines);
for (auto &chunk : img_chunks)
ImPlot::PlotImage((id_str + "plotimg").c_str(), (void *)(intptr_t)chunk.texture_id,
ImPlotPoint(chunk.offset_x, chunk.offset_y), ImPlotPoint(chunk.offset_x + chunk.img_width, chunk.offset_y + chunk.img_height));
auto pos = ImPlot::GetPlotMousePos(ImAxis_X1, ImAxis_Y1);
if (pos.x >= 0 && pos.y >= 0 &&
pos.x < fimg_width && pos.y < fimg_height)
mouseCallback(pos.x, (fimg_height - 1) - pos.y);
#ifdef __ANDROID__
auto pre_pos = ImGui::GetCursorPos();
ImGui::SetCursorPos({win_size.x - 130 * ui_scale + ImGui::GetScrollX(), win_size.y - 45 * ui_scale + ImGui::GetScrollY()});
if (ImGui::Button(" - ##smallerimage"))
addPlotScroll(*ImPlot::GetCurrentPlot(), -2);
ImGui::SameLine();
ImGui::Text(" ");
ImGui::SameLine();
if (ImGui::Button(" + ##biggerimage"))
addPlotScroll(*ImPlot::GetCurrentPlot(), 2);
ImGui::SetCursorPos(pre_pos);
#endif
if (ImGui::IsMouseDoubleClicked(ImGuiMouseButton_Right))
autoFitNextFrame = true;
ImPlot::EndPlot();
}
ImPlot::PopStyleVar();
ImPlot::PopStyleVar();
}
ImGui::EndChild();
image_mtx.unlock();
}
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