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gizmo.jai
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gizmo.jai
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CalculateDimFactor :: inline (center : Vec3f, axis : Vec3f) -> float #must
{
C := GetContext();
camera_position := TranslationVector(GetContext().camera_transform);
center_to_camera := normalize(camera_position - center);
return clamp((1 - abs(dot(axis, center_to_camera))) * 30 - 0.1, 0, 1);
}
CalculateWidgetSize :: inline (position : Vec3f) -> float #must
{
C := GetContext();
widget_size := distance(position, TranslationVector(C.camera_transform));
widget_size /= 1 / C.style.global_size * 12.5;
return widget_size;
}
GizmoTranslation :: (id : string, translation : *Vec3f, flags : GizmoFlags = 0) -> InteractionState
{
C := GetContext();
if flags & .No_Translation
return 0;
gizmo_id := GetID(id);
kb_state := KeyboardBehavior(gizmo_id, .Translate, translation.*);
if kb_state & .Cancelled
translation.* = C.drag_start_translation;
if kb_state & .Started
C.drag_start_translation = translation.*;
result_state : InteractionState;
result := translation.*;
defer translation.* = result;
PushID(id);
defer PopID();
model_matrix := GetGizmoMatrix();
model_rotation := RotationMatrix(model_matrix);
camera_forward := ForwardVector (C.camera_transform);
camera_right := RightVector(C.camera_transform);
camera_up := UpVector(C.camera_transform);
widget_size := CalculateWidgetSize(translation.*);
style := C.style;
axes_ids := u32.[
GetID("translate_x"),
GetID("translate_y"),
GetID("translate_z"),
];
planes_ids := u32.[
GetID("translate_xy"),
GetID("translate_yz"),
GetID("translate_zx"),
];
axes_vectors := Vec3f.[
.{1,0,0},
.{0,1,0},
.{0,0,1},
];
if !(flags & .Global_Space)
{
for * axes_vectors
it.* = transform_vector(model_rotation, it.*);
}
axes_colors := Vec4f.[
style.colors[StyleColor.X_Axis],
style.colors[StyleColor.Y_Axis],
style.colors[StyleColor.Z_Axis],
];
axes_active_colors := Vec4f.[
style.colors[StyleColor.X_Axis_Active],
style.colors[StyleColor.Y_Axis_Active],
style.colors[StyleColor.Z_Axis_Active],
];
axes_guide_colors := Vec4f.[
style.colors[StyleColor.X_Axis_Guide],
style.colors[StyleColor.Y_Axis_Guide],
style.colors[StyleColor.Z_Axis_Guide],
];
ignore_axes := bool.[
flags & .No_X_Axis != 0,
flags & .No_Y_Axis != 0,
flags & .No_Z_Axis != 0,
];
view_id := GetID("translate_view");
if C.active_id != view_id && !array_find(axes_ids, C.active_id)
{
DrawOrigin(translation.*);
}
ignore_view := flags & .No_View_Axis != 0;
ignore_view ||= C.active_id == gizmo_id && C.keyboard_interaction_flags != 0;
ignore_view ||= C.active_id != view_id && array_find(axes_ids, C.active_id);
if !ignore_view
{
drag_state : InteractionState;
if !kb_state
{
hovered := IsCircleFilledHovered(
translation.*,
-camera_forward,
widget_size * C.style.translation_view_circle_size
);
drag_state = DraggingBehavior(view_id, hovered, .Translation_Plane, translation.*);
}
else if C.keyboard_interaction_flags == 0
{
drag_state = kb_state;
}
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_translation;
if drag_state & .Interacting
{
C.active_interaction = .Translation_Plane;
if drag_state & .Started
C.drag_start_translation = translation.*;
origin := C.drag_start_translation;
ray_origin, ray_dir := RayFromMouse();
intersects, point := RayIntersectsPlane(ray_origin, ray_dir, origin, -camera_forward);
if intersects
{
if drag_state & .Started
C.drag_start_translation_offset = translation.* - point;
proj_point : Vec2f;
_, proj_point.x = ProjectPointOnInfiniteLine(point, origin, origin + camera_right);
_, proj_point.y = ProjectPointOnInfiniteLine(point, origin, origin + camera_up);
if IsKeyDown(.Snap)
{
proj_point.x = Snap(proj_point.x, C.style.translation_snap_grid_size);
proj_point.y = Snap(proj_point.y, C.style.translation_snap_grid_size);
}
point = origin + proj_point.x * camera_right + proj_point.y * camera_up;
result = point + C.drag_start_translation_offset;
}
_, proj_center := WorldToScreen(C.drag_start_translation);
DrawText(
tprint("X: % Y: % Z: %", result.x, result.y, result.z),
proj_center + .{10, 10},
C.style.colors[StyleColor.Text],
C.style.colors[StyleColor.Text_Shadow]
);
}
color := ifx C.hovered_id == view_id || C.active_id == view_id
then C.style.colors[StyleColor.View_Axis_Active]
else C.style.colors[StyleColor.View_Axis];
DrawCircle(
translation.*,
widget_size * C.style.translation_view_circle_size,
color,
C.style.translation_view_circle_thickness,
RightVector(C.camera_transform),
UpVector(C.camera_transform)
);
}
for #v2 < i : 0..2
{
id := axes_ids[i];
ignore_axis := ignore_axes[i];
ignore_axis ||= C.active_id == gizmo_id && C.keyboard_interaction_flags != xx (1 << i);
ignore_axis ||= C.active_id != id && array_find(axes_ids, C.active_id);
if ignore_axis
continue;
start := translation.* + widget_size * axes_vectors[i] * C.style.translation_view_circle_size;
end := translation.* + widget_size * axes_vectors[i];
dim := CalculateDimFactor(translation.*, axes_vectors[i]);
drag_state : InteractionState;
if !kb_state
{
hovered := dim > 0.1 && IsLineHovered(
start, end,
C.style.translation_handle_thickness + C.style.line_interaction_threshold
);
drag_state = DraggingBehavior(id, hovered, .Translation_Axis, translation.*);
}
else if C.keyboard_interaction_flags == xx (1 << i)
{
drag_state = kb_state;
}
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_translation;
if drag_state & .Interacting
{
C.active_interaction = .Translation_Axis;
if drag_state & .Started
C.drag_start_translation = translation.*;
center_behind, proj_center := WorldToScreen(C.drag_start_translation);
axis_behind, proj_axis := WorldToScreen(C.drag_start_translation + axes_vectors[i]);
if !center_behind && !axis_behind
{
mouse_offset := C.mouse_pos - C.mouse_drag_start;
proj_axis = normalize(proj_axis - proj_center);
mouse_dir := normalize(C.mouse_pos - C.mouse_drag_start);
dist := distance(C.mouse_drag_start, C.mouse_pos);
dist *= dot(proj_axis, mouse_dir);
dist *= C.style.translation_drag_sensitivity;
if IsKeyDown(.Slow)
dist *= C.style.sensitivity_slow_factor;
if IsKeyDown(.Snap)
dist = Snap(dist, C.style.translation_snap_grid_size);
result = C.drag_start_translation + axes_vectors[i] * dist;
DrawText(
tprint("X: % Y: % Z: %", result.x, result.y, result.z),
proj_center + .{10, 10},
C.style.colors[StyleColor.Text],
C.style.colors[StyleColor.Text_Shadow]
);
}
}
color := ifx C.hovered_id == id || C.active_id == id
then axes_active_colors[i] else axes_colors[i] * .{1,1,1,dim};
if drag_state & .Interacting
{
DrawLine(
translation.* - axes_vectors[i] * 500,
translation.* + axes_vectors[i] * 500,
axes_guide_colors[i],
style.guide_line_thickness
);
start = translation.*;
DrawCircleFilled(
start,
widget_size * C.style.origin_circle_size,
color,
camera_right, camera_up
);
}
DrawArrow(
start, end,
color,
style.translation_handle_thickness,
style.translation_arrow_size,
style.translation_arrow_aspect_ratio
);
}
return result_state;
}
GizmoScale :: (id : string, scale : *Vec3f, flags : GizmoFlags = 0) -> InteractionState
{
ThreeAxes :: struct
{
x, y, z : Vec3f;
#place x;
axes : [3]Vec3f;
}
operator * :: (axes : ThreeAxes, vec : Vec3f) -> ThreeAxes #must
{
return .{axes.x * vec.x, axes.y * vec.y, axes.z * vec.z};
}
GetScaleOnAxis :: (scale : ThreeAxes, axis : Vec3f) -> float #must
{
return abs(dot(scale.x, axis)) + abs(dot(scale.y, axis)) + abs(dot(scale.z, axis));
}
ProjectScale :: (scale : ThreeAxes, onto : ThreeAxes) -> Vec3f #must
{
return .{
GetScaleOnAxis(scale, onto.x),
GetScaleOnAxis(scale, onto.y),
GetScaleOnAxis(scale, onto.z),
};
}
C := GetContext();
if flags & .No_Scale
return 0;
model_matrix := GetGizmoMatrix();
translation := TranslationVector(model_matrix);
model_matrix = RotationMatrix(model_matrix);
gizmo_id := GetID(id);
kb_state := KeyboardBehavior(gizmo_id, .Scale, translation);
if kb_state & .Cancelled
scale.* = C.drag_start_scale;
if kb_state & .Started
C.drag_start_scale = scale.*;
result_state : InteractionState;
result := scale.*;
defer scale.* = result;
PushID(id);
defer PopID();
camera_forward := ForwardVector (C.camera_transform);
camera_right := RightVector(C.camera_transform);
camera_up := UpVector(C.camera_transform);
widget_size := CalculateWidgetSize(translation);
style := C.style;
all_id := GetID("scale_all");
axes_ids := u32.[
GetID("scale_x"),
GetID("scale_y"),
GetID("scale_z"),
all_id,
];
axes_vectors := Vec3f.[
.{1,0,0},
.{0,1,0},
.{0,0,1},
];
local_axes_vectors := Vec3f.[
.{1,0,0},
.{0,1,0},
.{0,0,1},
];
if !(flags & .Global_Space)
{
for * axes_vectors
it.* = transform_vector(model_matrix, it.*);
}
for * local_axes_vectors
it.* = transform_vector(model_matrix, it.*);
axes_colors := Vec4f.[
style.colors[StyleColor.X_Axis],
style.colors[StyleColor.Y_Axis],
style.colors[StyleColor.Z_Axis],
];
axes_active_colors := Vec4f.[
style.colors[StyleColor.X_Axis_Active],
style.colors[StyleColor.Y_Axis_Active],
style.colors[StyleColor.Z_Axis_Active],
];
axes_guide_colors := Vec4f.[
style.colors[StyleColor.X_Axis_Guide],
style.colors[StyleColor.Y_Axis_Guide],
style.colors[StyleColor.Z_Axis_Guide],
];
ignore_axes := bool.[
flags & .No_X_Axis != 0,
flags & .No_Y_Axis != 0,
flags & .No_Z_Axis != 0,
];
if !array_find(axes_ids, C.active_id)
DrawOrigin(translation);
for #v2 < i : 0..2
{
id := axes_ids[i];
ignore_axis := ignore_axes[i];
ignore_axis ||= C.active_id != id && array_find(axes_ids, C.active_id);
ignore_axis ||= C.active_id == gizmo_id && C.keyboard_interaction_flags != xx (1 << i);
if ignore_axis
continue;
start := translation + widget_size * axes_vectors[i] * C.style.scale_all_inner_circle_size;
end := translation + widget_size * axes_vectors[i];
dim := CalculateDimFactor(translation, axes_vectors[i]);
drag_state : InteractionState;
if !kb_state
{
hovered := dim > 0.1 && IsLineHovered(
start, end,
C.style.scale_handle_thickness + C.style.line_interaction_threshold
);
drag_state = DraggingBehavior(id, hovered, .Scale_Axis, translation);
}
else if C.keyboard_interaction_flags == xx (1 << i)
{
drag_state = kb_state;
}
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_scale;
if drag_state & .Interacting
{
if drag_state & .Started
{
C.drag_start_scale = ProjectScale(ThreeAxes.{axes=local_axes_vectors} * scale.*, .{axes=axes_vectors});
C.drag_start_scale_axis = axes_vectors[i];
}
end = translation + widget_size * C.drag_start_scale_axis;
is_behind, proj_center := WorldToScreen(translation);
if !is_behind
{
t1 := distance(proj_center, C.mouse_drag_start);
t2 := distance(proj_center, C.mouse_pos);
if IsKeyDown(.Slow)
t2 = t1 + (t2 - t1) * C.style.sensitivity_slow_factor;
s := Sign(C.drag_start_scale.component[i]);
center_to_start := normalize(C.mouse_drag_start - proj_center);
center_to_curr := normalize(C.mouse_pos - proj_center);
if dot(center_to_start, center_to_curr) < 0
s = -s;
ratio := t2 / t1;
additional_scale := s * abs(C.drag_start_scale.component[i]) * ratio - C.drag_start_scale.component[i];
if IsKeyDown(.Snap)
additional_scale = Snap(additional_scale, C.style.scale_snap_grid_size);
scale_axes := ThreeAxes.{
axes_vectors[0] * C.drag_start_scale.component[0],
axes_vectors[1] * C.drag_start_scale.component[1],
axes_vectors[2] * C.drag_start_scale.component[2],
};
scale_axes.axes[i] += axes_vectors[i] * additional_scale;
scale_on_axis := C.drag_start_scale.component[i] + additional_scale;
result = ProjectScale(scale_axes, .{axes=local_axes_vectors});
end = translation + widget_size * C.drag_start_scale_axis * s * ratio;
XYZ :: string.["X","Y","Z"];
DrawText(
tprint("%: %", XYZ[i], scale_on_axis),
proj_center + .{10, 10},
C.style.colors[StyleColor.Text],
C.style.colors[StyleColor.Text_Shadow]
);
}
}
color := ifx C.hovered_id == id || C.active_id == id
then axes_active_colors[i] else axes_colors[i] * .{1,1,1,dim};
if drag_state & .Interacting
{
DrawLine(
translation - axes_vectors[i] * 500,
translation + axes_vectors[i] * 500,
axes_guide_colors[i],
style.guide_line_thickness
);
start = translation;
DrawCircleFilled(
start,
widget_size * C.style.origin_circle_size,
color,
RightVector(C.camera_transform), UpVector(C.camera_transform)
);
}
DrawSquareArrow(
start, end,
color,
style.scale_handle_thickness,
style.scale_tip_size
);
}
ignore_all := flags & .No_View_Axis != 0;
ignore_all ||= C.active_id == gizmo_id && C.keyboard_interaction_flags != 0;
ignore_all ||= C.active_id != all_id && array_find(axes_ids, C.active_id);
if !ignore_all
{
drag_state : InteractionState;
if !kb_state
{
hovered := IsCircleFilledHovered(
translation,
-camera_forward,
widget_size * C.style.scale_all_outer_circle_size
);
drag_state = DraggingBehavior(all_id, hovered, .Scale_All, translation);
}
else if C.keyboard_interaction_flags == 0
{
drag_state = kb_state;
}
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_scale;
if drag_state & .Interacting
{
if drag_state & .Started
{
C.drag_start_scale = scale;
C.drag_start_scale_axis = .{1,1,1};
}
is_behind, proj_center := WorldToScreen(translation);
if !is_behind
{
t1 := distance(proj_center, C.mouse_drag_start);
t2 := distance(proj_center, C.mouse_pos);
if IsKeyDown(.Slow)
t2 = t1 + (t2 - t1) * C.style.sensitivity_slow_factor;
s := Vec3f.{
Sign(C.drag_start_scale.x),
Sign(C.drag_start_scale.y),
Sign(C.drag_start_scale.z),
};
center_to_start := normalize(C.mouse_drag_start - proj_center);
center_to_curr := normalize(C.mouse_pos - proj_center);
if dot(center_to_start, center_to_curr) < 0
s = -s;
widget_size *= t2 / t1;
ratio := t2 / t1;
additional_scale := s * abs(C.drag_start_scale) * ratio - C.drag_start_scale;
if IsKeyDown(.Snap)
{
additional_scale.x = Snap(additional_scale.x, C.style.scale_snap_grid_size);
additional_scale.y = Snap(additional_scale.y, C.style.scale_snap_grid_size);
additional_scale.z = Snap(additional_scale.z, C.style.scale_snap_grid_size);
}
result = C.drag_start_scale + additional_scale;
if IsKeyDown(.Snap)
{
result.x = Snap(result.x, C.style.scale_snap_grid_size);
result.y = Snap(result.y, C.style.scale_snap_grid_size);
result.z = Snap(result.z, C.style.scale_snap_grid_size);
}
DrawText(
tprint("X: % Y: % Z: %", result.x, result.y, result.z),
proj_center + .{10, 10},
C.style.colors[StyleColor.Text],
C.style.colors[StyleColor.Text_Shadow]
);
}
}
color := ifx C.hovered_id == all_id || C.active_id == all_id
then C.style.colors[StyleColor.View_Axis_Active]
else C.style.colors[StyleColor.View_Axis];
DrawCircle(
translation,
widget_size * C.style.scale_all_inner_circle_size,
color,
C.style.scale_all_handle_thickness,
RightVector(C.camera_transform),
UpVector(C.camera_transform)
);
if C.active_id != gizmo_id && C.active_id != all_id
{
DrawCircle(
translation,
widget_size * C.style.scale_all_outer_circle_size,
color,
C.style.scale_all_handle_thickness,
RightVector(C.camera_transform),
UpVector(C.camera_transform)
);
}
}
return result_state;
}
GizmoRotation :: (id : string, rotation : *Quatf, flags : GizmoFlags = 0) -> InteractionState
{
C := GetContext();
if flags & .No_Rotation
return 0;
matrix := GetGizmoMatrix();
translation := TranslationVector(matrix);
gizmo_id := GetID(id);
kb_state := KeyboardBehavior(gizmo_id, .Rotate, translation);
if kb_state & .Cancelled
rotation.* = C.drag_start_rotation;
if kb_state & .Started
C.drag_start_rotation = rotation.*;
result_state : InteractionState;
result := rotation.*;
defer rotation.* = result;
PushID(id);
defer PopID();
camera_forward := ForwardVector (C.camera_transform);
camera_right := RightVector(C.camera_transform);
camera_up := UpVector(C.camera_transform);
widget_size := CalculateWidgetSize(translation);
trackball_id := GetID("rotate_trackball");
axes_ids := u32.[
GetID("rotate_x"),
GetID("rotate_y"),
GetID("rotate_z"),
GetID("rotate_view"),
trackball_id,
];
axes_vectors := Vec3f.[
.{1,0,0},
.{0,1,0},
.{0,0,1},
camera_forward,
];
if !(flags & .Global_Space)
{
for i : 0..2
axes_vectors[i] = rotate(axes_vectors[i], rotation.*);
}
axes_colors := Vec4f.[
C.style.colors[StyleColor.X_Axis],
C.style.colors[StyleColor.Y_Axis],
C.style.colors[StyleColor.Z_Axis],
C.style.colors[StyleColor.View_Axis],
];
axes_active_colors := Vec4f.[
C.style.colors[StyleColor.X_Axis_Active],
C.style.colors[StyleColor.Y_Axis_Active],
C.style.colors[StyleColor.Z_Axis_Active],
C.style.colors[StyleColor.View_Axis_Active],
];
axes_guide_colors := Vec4f.[
C.style.colors[StyleColor.X_Axis_Guide],
C.style.colors[StyleColor.Y_Axis_Guide],
C.style.colors[StyleColor.Z_Axis_Guide],
C.style.colors[StyleColor.View_Axis_Guide],
];
ignore_axes := bool.[
flags & .No_X_Axis != 0,
flags & .No_Y_Axis != 0,
flags & .No_Z_Axis != 0,
flags & .No_View_Axis != 0,
];
if C.active_id != gizmo_id && !array_find(axes_ids, C.active_id)
DrawOrigin(translation);
for #v2 < i : 0..3
{
keyboard_flags : KeyboardInteractionFlags;
if i != 3
keyboard_flags = xx (1 << i);
id := axes_ids[i];
ignore_axis := ignore_axes[i];
ignore_axis ||= C.active_id == gizmo_id && C.keyboard_interaction_flags != keyboard_flags;
ignore_axis ||= C.active_id != id && array_find(axes_ids, C.active_id);
if ignore_axis
continue;
axis := axes_vectors[i];
tangent, bitangent : Vec3f;
radius : float;
thickness : float;
if i == 3
{
tangent = RightVector(C.camera_transform);
bitangent = UpVector(C.camera_transform);
radius = widget_size * C.style.rotation_view_axis_size;
thickness = C.style.rotation_view_axis_thickness;
}
else
{
tangent = axes_vectors[(i + 1) % 3];
bitangent = axes_vectors[(i + 2) % 3];
radius = widget_size;
thickness = C.style.rotation_handle_thickness;
}
drag_state : InteractionState;
if !kb_state
{
hovered := IsFacingCircleHovered(
translation,
radius,
thickness + ifx i == 3 then C.style.line_interaction_threshold,
tangent, bitangent
);
drag_state = DraggingBehavior(id, hovered, .Rotation_Axis, translation);
}
else if C.keyboard_interaction_flags == keyboard_flags
{
drag_state = kb_state;
}
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_rotation;
if drag_state & .Interacting
{
if drag_state & .Started
{
C.drag_start_rotation_axis = axes_vectors[i];
C.drag_start_rotation = rotation.*;
}
origin := translation;
ray_origin, ray_dir := RayFromMouse();
intersects, point := RayIntersectsPlane(ray_origin, ray_dir, origin, C.drag_start_rotation_axis);
if drag_state & .Started
{
C.drag_start_rotation_point = point;
}
is_behind, proj_center := WorldToScreen(translation);
if !is_behind
{
begin := normalize(proj_center - C.mouse_drag_start);
end := normalize(proj_center - C.mouse_pos);
s := ifx dot(camera_forward, axis) < 0 then -1.0 else 1.0;
angle := SignedAngle(Vec3f.{xy=begin,z=0}, Vec3f.{xy=end,z=0}, .{0,0,-s});
if IsKeyDown(.Slow)
angle *= C.style.sensitivity_slow_factor;
if IsKeyDown(.Snap)
angle = Snap(angle, C.style.rotation_snap_grid_size);
rotated : Quatf;
set_from_axis_and_angle(*rotated, C.drag_start_rotation_axis, angle);
result = rotated * C.drag_start_rotation;
normalize_or_identity(*result);
rotation_start_dir := normalize(C.drag_start_rotation_point - translation);
DrawSemiCircleFilled(
translation,
radius,
axes_guide_colors[i] * .{1,1,1,0.3},
tangent, bitangent,
SignedAngle(tangent, rotation_start_dir, C.drag_start_rotation_axis), -angle
);
DrawLine(
translation,
translation + rotation_start_dir * radius,
axes_active_colors[i],
C.style.guide_line_thickness
);
DrawLine(
translation,
translation + rotate(rotation_start_dir, rotated) * radius,
axes_active_colors[i],
thickness
);
_, angle_text_pos := WorldToScreen(translation + rotation_start_dir * radius * 1.2);
DrawText(
tprint("% deg", angle * 180 / PI),
angle_text_pos,
C.style.colors[StyleColor.Text],
C.style.colors[StyleColor.Text_Shadow]
);
}
}
color := ifx C.hovered_id == id || C.active_id == id
then axes_active_colors[i] else axes_colors[i];
if drag_state & .Interacting
{
DrawCircle(
translation,
radius,
color,
thickness,
tangent, bitangent
);
}
else
{
DrawFacingCircle(
translation,
radius,
color,
thickness,
tangent, bitangent
);
}
}
ignore_trackball := (flags & .No_Trackball) != 0;
ignore_trackball ||= C.active_id == gizmo_id;
ignore_trackball ||= C.active_id != trackball_id && array_find(axes_ids, C.active_id);
if !ignore_trackball
{
hovered := IsCircleFilledHovered(translation, camera_forward, widget_size);
drag_state := DraggingBehavior(trackball_id, hovered, .Rotation_Trackball, translation);
if drag_state
result_state = drag_state;
if drag_state & .Cancelled
result = C.drag_start_rotation;
if drag_state & .Interacting
{
if drag_state & .Started
{
C.drag_start_rotation = rotation.*;
}
camera_rotation := get_rotation(C.camera_view);
start_axis := Project2DPointOn3DSphere(C.mouse_drag_start, translation, widget_size);
start_axis = normalize(start_axis);
start_axis = rotate(start_axis, camera_rotation);
curr_axis := Project2DPointOn3DSphere(C.mouse_pos, translation, widget_size);
curr_axis = normalize(curr_axis);
curr_axis = rotate(curr_axis, camera_rotation);
result = C.drag_start_rotation * QuatfFromVectorToVector(start_axis, curr_axis);
}
trackball_color := ifx C.hovered_id == trackball_id || C.active_id == trackball_id
then C.style.colors[StyleColor.Rotation_Trackball_Active]
else C.style.colors[StyleColor.Rotation_Trackball];
if !(drag_state & .Interacting)
{
DrawCircleFilled(
translation,
widget_size,
trackball_color,
RightVector(C.camera_transform), UpVector(C.camera_transform)
);
}
else
{
DrawFacingCircle(
translation,
widget_size,
C.style.colors[StyleColor.Z_Axis],
C.style.rotation_handle_thickness,
axes_vectors[0], axes_vectors[1]
);
DrawFacingCircle(
translation,
widget_size,
C.style.colors[StyleColor.Y_Axis],
C.style.rotation_handle_thickness,
axes_vectors[2], axes_vectors[0]
);
DrawFacingCircle(
translation,
widget_size,
C.style.colors[StyleColor.X_Axis],
C.style.rotation_handle_thickness,
axes_vectors[1], axes_vectors[2]
);
}
}
return result_state;
}
GizmoTransform :: (
id : string,
translation : *Vec3f,
rotation : *Quatf,
scale : *Vec3f,
type : GizmoType,
flags : GizmoFlags = 0
) -> InteractionState
{
C := GetContext();
parent := GetGizmoMatrix();
inv_parent := inverse(parent);
matrix := make_translation_matrix4(translation.*)
* rotation_matrix(Mat4f, rotation.*)
* make_scale_matrix4(scale.*);
PushGizmoMatrix(matrix);
defer PopGizmoMatrix();
gizmo_id := GetID(id);
if C.keyboard_focus_id == gizmo_id && C.active_id == 0
{
if IsKeyPressed(.Translate)
type = .Translate;
if IsKeyPressed(.Rotate)
type = .Rotate;
if IsKeyPressed(.Scale)
type = .Scale;
}
if C.active_id == gizmo_id
{
if C.keyboard_interaction ==
{
case .Translate;
type = .Translate;
case .Rotate;
type = .Rotate;
case .Scale;
type = .Scale;
}
}
if #complete type ==
{
case .Translate;
translation.* = transform_point(parent, translation.*);
defer translation.* = transform_point(inv_parent, translation.*);
return GizmoTranslation(id, translation, flags);
case .Rotate;
// Transform the quaternion to global space first
// Transform back to local space afterwards
q := QuatfFromMatrix(parent);
inv_q := conjugate(q);
rotation.* = q * rotation.*;