Function GetScale

Source/Editors/map_editor.cpp:3132–3230

}

static vec3 GetScale(const LineSegment& mouseray, vec3* trans, bool snapping_enabled, const vec3& cam_moved,
                     const ControlEditorInfo* control_editor_info, Tool* tool_, Object* object_, const Box& box_) {
    static const float SCALE_SNAP_INCR = 1.50f;  // incr whenever new size = 1.25 * old size
    if (trans) {
        *trans = vec3(0.0f);
    }
    vec3 new_clicked_point;
    vec3 old_clicked_point;
    vec3 original_click_dir = normalize(control_editor_info->start_mouseray_.end - control_editor_info->start_mouseray_.start);
    if (tool_->mode == SCALE_NORMAL) {
        vec3 mouseray_dir = normalize(mouseray.end - mouseray.start);
        RayLineClosestPoint(mouseray.start, mouseray_dir, tool_->center, -control_editor_info->basis_.facing, &new_clicked_point);
        RayLineClosestPoint(control_editor_info->start_cam_pos, original_click_dir, tool_->center, -control_editor_info->basis_.facing, &old_clicked_point);
    } else if (tool_->mode == SCALE_PLANE) {
        vec3 mouseray_dir = normalize(mouseray.end - mouseray.start);
        float to_dist = RayPlaneIntersection(mouseray.start, mouseray_dir, tool_->center, -control_editor_info->basis_.facing);
        if (to_dist > 0.0f) {
            new_clicked_point = mouseray.start + to_dist * mouseray_dir;
        } else {
            LOG_ASSERT(false);
            return vec3(1.0f);
        }
        to_dist = RayPlaneIntersection(control_editor_info->start_cam_pos, original_click_dir, tool_->center, -control_editor_info->basis_.facing);
        if (to_dist > 0.0f) {
            old_clicked_point = control_editor_info->start_cam_pos + to_dist * original_click_dir;
        } else {
            LOG_ASSERT(false);
            return vec3(1.0f);
        }
    }

    vec3 initial_rel_point;
    vec3 scale;
    if (tool_->mode == SCALE_WHOLE) {
        Camera* cam = ActiveCameras::Get();
        vec3 cam_facing = cam->GetFacing();
        vec3 center = tool_->center;
        vec3 mouseray_dir = normalize(mouseray.end - mouseray.start);
        float t = RayPlaneIntersection(mouseray.start, mouseray_dir, center, cam_facing);
        vec3 curr_mouse_on_plane = mouseray.start + mouseray_dir * t;
        float t3 = RayPlaneIntersection(control_editor_info->start_cam_pos, original_click_dir, center, cam_facing);
        vec3 orig_mouse_on_plane = control_editor_info->start_cam_pos + original_click_dir * t3;
        float length_real_old = length(orig_mouse_on_plane - center);
        float length_new = length(curr_mouse_on_plane - center);

        vec3 cam_up = cam->GetUpVector();
        vec3 cam_right = cross(cam_facing, cam_up);
        mat4 old_scale;
        old_scale.SetUniformScale(length_real_old);
        mat4 new_scale;
        new_scale.SetUniformScale(length_new);
        mat4 circle_transform;
        circle_transform.SetColumn(0, cam_right);
        circle_transform.SetColumn(1, cam_up);
        circle_transform.SetColumn(2, cam_facing);
        circle_transform.SetTranslationPart(center + cam_moved);
        DebugDraw::Instance()->AddCircle(circle_transform * old_scale, vec4(0.0f, 0.0f, 0.0f, 0.5f), _delete_on_update, _DD_XRAY);
        DebugDraw::Instance()->AddCircle(circle_transform * new_scale, vec4(1.0f, 1.0f, 1.0f, 0.5f), _delete_on_update, _DD_XRAY);