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feat: added NoMove and NoResize flags to ImPlotDragToolFlags #720

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feat: added NoMove and NoResize flags to ImPlotDragToolFlags #720

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24522b2
fix: DragRect can no longer be clicked outside the plot area
PysKa-Ratzinger Sep 16, 2026
a85a2cb
fix: DragPoint and DragLines can no longer be clicked outside the plo…
PysKa-Ratzinger Sep 16, 2026
9a39037
feat: added NoMove and NoResize flags to ImPlotDragToolFlags
PysKa-Ratzinger Sep 16, 2026
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131 changes: 76 additions & 55 deletions implot.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3973,6 +3973,7 @@ bool DragPoint(int n_id, double* x, double* y, const ImVec4& col, float radius,
const bool input = !ImHasFlag(flags, ImPlotDragToolFlags_NoInputs);
const bool show_curs = !ImHasFlag(flags, ImPlotDragToolFlags_NoCursors);
const bool no_delay = !ImHasFlag(flags, ImPlotDragToolFlags_Delayed);
const bool move_allowed = !ImHasFlag(flags, ImPlotDragToolFlags_NoMove);
const float grab_half_size = ImMax(DRAG_GRAB_HALF_SIZE, radius);
const ImVec4 color = IsColorAuto(col) ? ImGui::GetStyleColorVec4(ImGuiCol_Text) : col;
const ImU32 col32 = ImGui::ColorConvertFloat4ToU32(color);
Expand All @@ -3984,14 +3985,15 @@ bool DragPoint(int n_id, double* x, double* y, const ImVec4& col, float radius,

ImGui::KeepAliveID(id);
if (input) {
rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
bool clicked = ImGui::ButtonBehavior(rect,id,&hovered,&held);
if (out_clicked) *out_clicked = clicked;
if (out_hovered) *out_hovered = hovered;
if (out_held) *out_held = held;
}

bool modified = false;
if (held && ImGui::IsMouseDragging(0)) {
if (move_allowed && held && ImGui::IsMouseDragging(0)) {
*x = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).x;
*y = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
modified = true;
Expand Down Expand Up @@ -4023,6 +4025,8 @@ bool DragLineX(int n_id, double* value, const ImVec4& col, float thickness, ImPl
const bool input = !ImHasFlag(flags, ImPlotDragToolFlags_NoInputs);
const bool show_curs = !ImHasFlag(flags, ImPlotDragToolFlags_NoCursors);
const bool no_delay = !ImHasFlag(flags, ImPlotDragToolFlags_Delayed);
const bool move_allowed = !ImHasFlag(flags, ImPlotDragToolFlags_NoMove);

const float grab_half_size = ImMax(DRAG_GRAB_HALF_SIZE, thickness/2);
float yt = gp.CurrentPlot->PlotRect.Min.y;
float yb = gp.CurrentPlot->PlotRect.Max.y;
Expand All @@ -4033,6 +4037,7 @@ bool DragLineX(int n_id, double* value, const ImVec4& col, float thickness, ImPl

ImGui::KeepAliveID(id);
if (input) {
rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
bool clicked = ImGui::ButtonBehavior(rect,id,&hovered,&held);
if (out_clicked) *out_clicked = clicked;
if (out_hovered) *out_hovered = hovered;
Expand All @@ -4047,7 +4052,7 @@ bool DragLineX(int n_id, double* value, const ImVec4& col, float thickness, ImPl
ImU32 col32 = ImGui::ColorConvertFloat4ToU32(color);

bool modified = false;
if (held && ImGui::IsMouseDragging(0)) {
if (move_allowed && held && ImGui::IsMouseDragging(0)) {
*value = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).x;
modified = true;
}
Expand Down Expand Up @@ -4078,6 +4083,8 @@ bool DragLineY(int n_id, double* value, const ImVec4& col, float thickness, ImPl
const bool input = !ImHasFlag(flags, ImPlotDragToolFlags_NoInputs);
const bool show_curs = !ImHasFlag(flags, ImPlotDragToolFlags_NoCursors);
const bool no_delay = !ImHasFlag(flags, ImPlotDragToolFlags_Delayed);
const bool move_allowed = !ImHasFlag(flags, ImPlotDragToolFlags_NoMove);

const float grab_half_size = ImMax(DRAG_GRAB_HALF_SIZE, thickness/2);
float xl = gp.CurrentPlot->PlotRect.Min.x;
float xr = gp.CurrentPlot->PlotRect.Max.x;
Expand All @@ -4089,6 +4096,7 @@ bool DragLineY(int n_id, double* value, const ImVec4& col, float thickness, ImPl

ImGui::KeepAliveID(id);
if (input) {
rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
bool clicked = ImGui::ButtonBehavior(rect,id,&hovered,&held);
if (out_clicked) *out_clicked = clicked;
if (out_hovered) *out_hovered = hovered;
Expand All @@ -4103,7 +4111,7 @@ bool DragLineY(int n_id, double* value, const ImVec4& col, float thickness, ImPl
ImU32 col32 = ImGui::ColorConvertFloat4ToU32(color);

bool modified = false;
if (held && ImGui::IsMouseDragging(0)) {
if (move_allowed && held && ImGui::IsMouseDragging(0)) {
*value = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
modified = true;
}
Expand Down Expand Up @@ -4134,6 +4142,9 @@ bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_m
const bool input = !ImHasFlag(flags, ImPlotDragToolFlags_NoInputs);
const bool show_curs = !ImHasFlag(flags, ImPlotDragToolFlags_NoCursors);
const bool no_delay = !ImHasFlag(flags, ImPlotDragToolFlags_Delayed);
const bool move_allowed = !ImHasFlag(flags, ImPlotDragToolFlags_NoMove);
const bool resize_allowed = !ImHasFlag(flags, ImPlotDragToolFlags_NoResize);

bool h[] = {true,false,true,false};
double* x[] = {x_min,x_max,x_max,x_min};
double* y[] = {y_min,y_min,y_max,y_max};
Expand All @@ -4143,6 +4154,7 @@ bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_m
ImVec2 pc = PlotToPixels((*x_min+*x_max)/2,(*y_min+*y_max)/2,IMPLOT_AUTO,IMPLOT_AUTO);
ImRect rect(ImMin(p[0],p[2]),ImMax(p[0],p[2]));
ImRect rect_grab = rect; rect_grab.Expand(DRAG_GRAB_HALF_SIZE);
rect_grab.ClipWithFull(GImPlot->CurrentPlot->PlotRect);

ImGuiMouseCursor cur[4];
if (show_curs) {
Expand All @@ -4162,11 +4174,12 @@ bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_m
bool clicked = false, hovered = false, held = false;

const bool is_movable = *x_min != *x_max || *y_min != *y_max;
if (is_movable) {
if (is_movable && move_allowed) {
ImGui::KeepAliveID(id);
if (input) {
// middle point
ImRect b_rect(pc.x-DRAG_GRAB_HALF_SIZE,pc.y-DRAG_GRAB_HALF_SIZE,pc.x+DRAG_GRAB_HALF_SIZE,pc.y+DRAG_GRAB_HALF_SIZE);
b_rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
clicked = ImGui::ButtonBehavior(b_rect,id,&hovered,&held);
if (out_clicked) *out_clicked = clicked;
if (out_hovered) *out_hovered = hovered;
Expand All @@ -4185,56 +4198,60 @@ bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_m
}
}

for (int i = 0; i < 4; ++i) {
// points
ImRect b_rect(p[i].x - DRAG_GRAB_HALF_SIZE, p[i].y - DRAG_GRAB_HALF_SIZE, p[i].x + DRAG_GRAB_HALF_SIZE, p[i].y + DRAG_GRAB_HALF_SIZE);
ImGuiID p_id = id + i + 1;
ImGui::KeepAliveID(p_id);
if (input) {
clicked = ImGui::ButtonBehavior(b_rect,p_id,&hovered,&held);
if (out_clicked) *out_clicked = *out_clicked || clicked;
if (out_hovered) *out_hovered = *out_hovered || hovered;
if (out_held) *out_held = *out_held || held;
}
if ((hovered || held) && show_curs)
ImGui::SetMouseCursor(cur[i]);

if (held && ImGui::IsMouseDragging(0)) {
*x[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).x;
*y[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
modified = true;
}
if (resize_allowed) {
for (int i = 0; i < 4; ++i) {
// points
ImRect b_rect(p[i].x - DRAG_GRAB_HALF_SIZE, p[i].y - DRAG_GRAB_HALF_SIZE, p[i].x + DRAG_GRAB_HALF_SIZE, p[i].y + DRAG_GRAB_HALF_SIZE);
b_rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
ImGuiID p_id = id + i + 1;
ImGui::KeepAliveID(p_id);
if (input) {
clicked = ImGui::ButtonBehavior(b_rect,p_id,&hovered,&held);
if (out_clicked) *out_clicked = *out_clicked || clicked;
if (out_hovered) *out_hovered = *out_hovered || hovered;
if (out_held) *out_held = *out_held || held;
}
if ((hovered || held) && show_curs)
ImGui::SetMouseCursor(cur[i]);

// edges
ImVec2 e_min = ImMin(p[i],p[(i+1)%4]);
ImVec2 e_max = ImMax(p[i],p[(i+1)%4]);
b_rect = h[i] ? ImRect(e_min.x + DRAG_GRAB_HALF_SIZE, e_min.y - DRAG_GRAB_HALF_SIZE, e_max.x - DRAG_GRAB_HALF_SIZE, e_max.y + DRAG_GRAB_HALF_SIZE)
: ImRect(e_min.x - DRAG_GRAB_HALF_SIZE, e_min.y + DRAG_GRAB_HALF_SIZE, e_max.x + DRAG_GRAB_HALF_SIZE, e_max.y - DRAG_GRAB_HALF_SIZE);
ImGuiID e_id = id + i + 5;
ImGui::KeepAliveID(e_id);
if (input) {
clicked = ImGui::ButtonBehavior(b_rect,e_id,&hovered,&held);
if (out_clicked) *out_clicked = *out_clicked || clicked;
if (out_hovered) *out_hovered = *out_hovered || hovered;
if (out_held) *out_held = *out_held || held;
}
if ((hovered || held) && show_curs)
h[i] ? ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNS) : ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
if (held && ImGui::IsMouseDragging(0)) {
if (h[i])
*y[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
else
if (held && ImGui::IsMouseDragging(0)) {
*x[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).x;
modified = true;
}
if (hovered && ImGui::IsMouseDoubleClicked(0))
{
ImPlotRect b = GetPlotLimits(IMPLOT_AUTO,IMPLOT_AUTO);
if (h[i])
*y[i] = ((y[i] == y_min && *y_min < *y_max) || (y[i] == y_max && *y_max < *y_min)) ? b.Y.Min : b.Y.Max;
else
*x[i] = ((x[i] == x_min && *x_min < *x_max) || (x[i] == x_max && *x_max < *x_min)) ? b.X.Min : b.X.Max;
modified = true;
*y[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
modified = true;
}

// edges
ImVec2 e_min = ImMin(p[i],p[(i+1)%4]);
ImVec2 e_max = ImMax(p[i],p[(i+1)%4]);
b_rect = h[i] ? ImRect(e_min.x + DRAG_GRAB_HALF_SIZE, e_min.y - DRAG_GRAB_HALF_SIZE, e_max.x - DRAG_GRAB_HALF_SIZE, e_max.y + DRAG_GRAB_HALF_SIZE)
: ImRect(e_min.x - DRAG_GRAB_HALF_SIZE, e_min.y + DRAG_GRAB_HALF_SIZE, e_max.x + DRAG_GRAB_HALF_SIZE, e_max.y - DRAG_GRAB_HALF_SIZE);
b_rect.ClipWithFull(GImPlot->CurrentPlot->PlotRect);
ImGuiID e_id = id + i + 5;
ImGui::KeepAliveID(e_id);
if (input) {
clicked = ImGui::ButtonBehavior(b_rect,e_id,&hovered,&held);
if (out_clicked) *out_clicked = *out_clicked || clicked;
if (out_hovered) *out_hovered = *out_hovered || hovered;
if (out_held) *out_held = *out_held || held;
}
if ((hovered || held) && show_curs)
h[i] ? ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNS) : ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
if (held && ImGui::IsMouseDragging(0)) {
if (h[i])
*y[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).y;
else
*x[i] = ImPlot::GetPlotMousePos(IMPLOT_AUTO,IMPLOT_AUTO).x;
modified = true;
}
if (hovered && ImGui::IsMouseDoubleClicked(0))
{
ImPlotRect b = GetPlotLimits(IMPLOT_AUTO,IMPLOT_AUTO);
if (h[i])
*y[i] = ((y[i] == y_min && *y_min < *y_max) || (y[i] == y_max && *y_max < *y_min)) ? b.Y.Min : b.Y.Max;
else
*x[i] = ((x[i] == x_min && *x_min < *x_max) || (x[i] == x_max && *x_max < *x_min)) ? b.X.Min : b.X.Max;
modified = true;
}
}
}

Expand All @@ -4258,9 +4275,13 @@ bool DragRect(int n_id, double* x_min, double* y_min, double* x_max, double* y_m
DrawList.AddRectFilled(rect.Min, rect.Max, col32_a);
DrawList.AddRect(rect.Min, rect.Max, col32);
if (input && (modified || mouse_inside)) {
DrawList.AddCircleFilled(pc,DRAG_GRAB_HALF_SIZE,col32);
for (int i = 0; i < 4; ++i)
DrawList.AddCircleFilled(p[i],DRAG_GRAB_HALF_SIZE,col32);
if (move_allowed) {
DrawList.AddCircleFilled(pc,DRAG_GRAB_HALF_SIZE,col32);
}
if (resize_allowed) {
for (int i = 0; i < 4; ++i)
DrawList.AddCircleFilled(p[i],DRAG_GRAB_HALF_SIZE,col32);
}
}
PopPlotClipRect();
ImGui::PopID();
Expand Down
2 changes: 2 additions & 0 deletions implot.h
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,8 @@ enum ImPlotDragToolFlags_ {
ImPlotDragToolFlags_NoFit = 1 << 1, // the drag tool won't be considered for plot fits
ImPlotDragToolFlags_NoInputs = 1 << 2, // lock the tool from user inputs
ImPlotDragToolFlags_Delayed = 1 << 3, // tool rendering will be delayed one frame; useful when applying position-constraints
ImPlotDragToolFlags_NoMove = 1 << 4, // lock the tool from user inputs
ImPlotDragToolFlags_NoResize = 1 << 5, // lock the tool from user inputs
};

// Flags for ColormapScale
Expand Down
10 changes: 7 additions & 3 deletions implot_demo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1911,7 +1911,8 @@ void Demo_DragPoints() {
static ImPlotDragToolFlags flags = ImPlotDragToolFlags_None;
ImGui::CheckboxFlags("NoCursors", (unsigned int*)&flags, ImPlotDragToolFlags_NoCursors); ImGui::SameLine();
ImGui::CheckboxFlags("NoFit", (unsigned int*)&flags, ImPlotDragToolFlags_NoFit); ImGui::SameLine();
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs);
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs); ImGui::SameLine();
ImGui::CheckboxFlags("NoMove", (unsigned int*)&flags, ImPlotDragToolFlags_NoMove);
ImPlotAxisFlags ax_flags = ImPlotAxisFlags_NoTickLabels | ImPlotAxisFlags_NoTickMarks;
bool clicked[4] = {false, false, false, false};
bool hovered[4] = {false, false, false, false};
Expand Down Expand Up @@ -1973,7 +1974,8 @@ void Demo_DragLines() {
static ImPlotDragToolFlags flags = ImPlotDragToolFlags_None;
ImGui::CheckboxFlags("NoCursors", (unsigned int*)&flags, ImPlotDragToolFlags_NoCursors); ImGui::SameLine();
ImGui::CheckboxFlags("NoFit", (unsigned int*)&flags, ImPlotDragToolFlags_NoFit); ImGui::SameLine();
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs);
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs); ImGui::SameLine();
ImGui::CheckboxFlags("NoMove", (unsigned int*)&flags, ImPlotDragToolFlags_NoMove);
if (ImPlot::BeginPlot("##lines",ImVec2(-1,0))) {
ImPlot::SetupAxesLimits(0,1,0,1);
ImPlot::DragLineX(0,&x1,ImVec4(1,1,1,1),1,flags);
Expand Down Expand Up @@ -2019,7 +2021,9 @@ void Demo_DragRects() {
static ImPlotDragToolFlags flags = ImPlotDragToolFlags_None;
ImGui::CheckboxFlags("NoCursors", (unsigned int*)&flags, ImPlotDragToolFlags_NoCursors); ImGui::SameLine();
ImGui::CheckboxFlags("NoFit", (unsigned int*)&flags, ImPlotDragToolFlags_NoFit); ImGui::SameLine();
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs);
ImGui::CheckboxFlags("NoInput", (unsigned int*)&flags, ImPlotDragToolFlags_NoInputs); ImGui::SameLine();
ImGui::CheckboxFlags("NoMove", (unsigned int*)&flags, ImPlotDragToolFlags_NoMove); ImGui::SameLine();
ImGui::CheckboxFlags("NoResize", (unsigned int*)&flags, ImPlotDragToolFlags_NoResize);

if (ImPlot::BeginPlot("##Main",ImVec2(-1,ImGui::GetTextLineHeight()*10))) {
ImPlot::SetupAxes(nullptr,nullptr,ImPlotAxisFlags_NoTickLabels,ImPlotAxisFlags_NoTickLabels);
Expand Down