[fix] wrong scale value

ui/zenoedit/viewport/cameracontrol.cpp

@@ -127,7 +127,7 @@ void CameraControl::fakeMousePressEvent(QMouseEvent *event)
         }
     }
     if (event->buttons() & Qt::MiddleButton) {
-        m_lastPos = event->pos();
+        m_lastMidButtonPos = event->pos();
     } else if (event->buttons() & Qt::LeftButton) {
         m_boundRectStartPos = event->pos();
         // check if clicked a selected object
@@ -271,11 +271,11 @@ void CameraControl::fakeMouseMoveEvent(QMouseEvent *event)
 {
     auto session = m_zenovis->getSession();
     auto scene = session->get_scene();
+    float xpos = event->x(), ypos = event->y();
 
     if (event->buttons() & Qt::MiddleButton) {
         float ratio = QApplication::desktop()->devicePixelRatio();
-        float xpos = event->x(), ypos = event->y();
-        float dx = xpos - m_lastPos.x(), dy = ypos - m_lastPos.y();
+        float dx = xpos - m_lastMidButtonPos.x(), dy = ypos - m_lastMidButtonPos.y();
         dx *= ratio / m_res[0];
         dy *= ratio / m_res[1];
         bool shift_pressed = event->modifiers() & Qt::ShiftModifier;
@@ -299,20 +299,25 @@ void CameraControl::fakeMouseMoveEvent(QMouseEvent *event)
             setTheta(getTheta() - dy * M_PI);
             setPhi(getPhi() + dx * M_PI);
         }
-        m_lastPos = QPointF(xpos, ypos);
+        m_lastMidButtonPos = QPointF(xpos, ypos);
     } else if (event->buttons() & Qt::LeftButton) {
         if (m_transformer)
         {
             if (m_transformer->isTransforming()) {
                 auto dir = screenToWorldRay(event->pos().x() / res().x(), event->pos().y() / res().y());
                 auto camera_pos = realPos();
-                auto x = event->x() * 1.0f;
-                auto y = event->y() * 1.0f;
-                x = (2 * x / res().x()) - 1;
-                y = 1 - (2 * y / res().y());
-                auto mouse_pos = glm::vec2(x, y);
+
+                // mouse pos
+                auto mouse_pos = glm::vec2(xpos, ypos);
+                mouse_pos[0] = (2 * mouse_pos[0] / res().x()) - 1;
+                mouse_pos[1] = 1 - (2 * mouse_pos[1] / res().y());
+                // mouse start
+                auto mouse_start = glm::vec2(m_boundRectStartPos.x(), m_boundRectStartPos.y());
+                mouse_start[0] = (2 * mouse_start[0] / res().x()) - 1;
+                mouse_start[1] = 1 - (2 * mouse_start[1] / res().y());
+
                 auto vp = scene->camera->m_proj * scene->camera->m_view;
-                m_transformer->transform(camera_pos, mouse_pos, dir, scene->camera->m_lodfront, vp);
+                m_transformer->transform(camera_pos, dir, mouse_start, mouse_pos, scene->camera->m_lodfront, vp);
                 zenoApp->getMainWindow()->updateViewport();
             } else {
                 float min_x = std::min((float)m_boundRectStartPos.x(), (float)event->x()) / m_res.x();

ui/zenoedit/viewport/cameracontrol.h

@@ -55,7 +55,7 @@ class CameraControl : public QObject
     void resizeTransformHandler(int dir);
 
 private:
-    QPointF m_lastPos;
+    QPointF m_lastMidButtonPos;
     QPoint m_boundRectStartPos;
     QVector2D m_res;
     QSet<int> m_pressedKeys;

ui/zenoedit/viewportinteraction/transform.cpp

@@ -159,7 +159,7 @@ bool FakeTransformer::clickedAnyHandler(QVector3D ori, QVector3D dir, glm::vec3
     return m_operation_mode != zenovis::INTERACT_NONE;
 }
 
-void FakeTransformer::transform(QVector3D camera_pos, glm::vec2 mouse_pos, QVector3D ray_dir, glm::vec3 front, glm::mat4 vp) {
+void FakeTransformer::transform(QVector3D camera_pos, QVector3D ray_dir, glm::vec2 mouse_start, glm::vec2 mouse_pos, glm::vec3 front, glm::mat4 vp) {
     if (m_operation == NONE) return;
 
     auto pZenovis = m_viewport->getZenoVis();
@@ -256,9 +256,17 @@ void FakeTransformer::transform(QVector3D camera_pos, glm::vec2 mouse_pos, QVect
         }
     }
     else if (m_operation == SCALE) {
+        // make a circle, center is m_objects_center
+        // when mouse press, get the circle's radius, r = len(m_objects_center - mouse_start)
+        // when mouse move, get the len from center to mouse_pos, d = len(m_objects_center - mouse_pos)
+        // so the scale is d / r
         auto t_ctr = vp * glm::vec4(m_objects_center, 1.0f);
         glm::vec2 ctr = t_ctr / t_ctr[3];
-        auto scale_size = glm::length(ctr - mouse_pos);
+        auto len_ctr_start = glm::length(ctr - mouse_start);
+        if (len_ctr_start < 0.001) return;
+
+        auto len_ctr_pos = glm::length(ctr - mouse_pos);
+        auto scale_size = len_ctr_pos / len_ctr_start;
         if (m_operation_mode == zenovis::INTERACT_X) {
             scale(scale_size, {1, 0, 0});
         }
@@ -635,8 +643,8 @@ void FakeTransformer::translate(glm::vec3 start, glm::vec3 end, glm::vec3 axis)
 
 void FakeTransformer::scale(float scale_size, vec3i axis) {
     glm::vec3 scale(1.0f);
-    for (int i=0; i<3; i++)
-        if (axis[i] == 1) scale[i] = fmax(scale_size * 3, 0.1);
+    for (int i = 0; i < 3; i++)
+        if (axis[i] == 1) scale[i] = std::max(scale_size, 0.1f);
     m_scale = scale;
     doTransform();
 }

ui/zenoedit/viewportinteraction/transform.h

@@ -32,7 +32,7 @@ class FakeTransformer {
     void removeObject(const std::unordered_set<std::string>& names);
     bool calcTransformStart(glm::vec3 ori, glm::vec3 dir, glm::vec3 front);
     bool clickedAnyHandler(QVector3D ori, QVector3D dir, glm::vec3 front);
-    void transform(QVector3D camera_pos, glm::vec2 mouse_pos, QVector3D ray_dir, glm::vec3 front, glm::mat4 vp);
+    void transform(QVector3D camera_pos, QVector3D ray_dir, glm::vec2 mouse_start, glm::vec2 mouse_pos, glm::vec3 front, glm::mat4 vp);
     void startTransform();
     void endTransform(bool moved);
     bool isTransforming() const;

zenovis/include/zenovis/bate/GraphicHandlerUtils.h

@@ -116,10 +116,11 @@ void drawSquare(vec3f pos, vec3f a, vec3f b, vec3f color, float size, std::uniqu
 }
 
 void drawCircle(vec3f pos, vec3f a, vec3f b, vec3f color, float size, std::unique_ptr<Buffer> &vbo) {
+    constexpr int point_num = 100;
+    constexpr double step = 1.0 / point_num;
     std::vector<vec3f> mem;
+    mem.reserve(point_num * 2);
 
-    double point_num = 100;
-    double step = 1.0 / point_num;
     for (double t = 0; t < 1.0; t += step) {
         double theta = 2.0 * PI * t;
         auto p = pos + size * cos(theta) * a + size * sin(theta) * b;
@@ -133,13 +134,43 @@ void drawCircle(vec3f pos, vec3f a, vec3f b, vec3f color, float size, std::uniqu
     vbo->attribute(0, sizeof(float) * 0, sizeof(float) * 6, GL_FLOAT, 3);
     vbo->attribute(1, sizeof(float) * 3, sizeof(float) * 6, GL_FLOAT, 3);
 
-    CHECK_GL(glDrawArrays(GL_LINE_STRIP, 0, vertex_count));
+    CHECK_GL(glDrawArrays(GL_LINE_LOOP, 0, vertex_count));
 
     vbo->disable_attribute(0);
     vbo->disable_attribute(1);
     vbo->unbind();
 }
 
+void drawCircle(vec3f pos, vec3f a, vec3f b, vec3f color, float size, float width, std::unique_ptr<Buffer> &vbo) {
+    constexpr int point_num = 100;
+    constexpr double step = 1.0 / point_num;
+    std::vector<vec3f> mem;
+    mem.reserve(point_num * 4);
+
+    float inner_size = size - width / 2.0;
+    float outer_size = size + width / 2.0;
+    for (double t = 0; t < 1.0 + step; t += step) {
+        double theta = 2.0 * PI * t;
+        auto p1 = pos + inner_size * cos(theta) * a + inner_size * sin(theta) * b;
+        auto p2 = pos + outer_size * cos(theta) * a + outer_size * sin(theta) * b;
+        mem.push_back(p1);
+        mem.push_back(color);
+        mem.push_back(p2);
+        mem.push_back(color);
+    }
+
+    auto vertex_count = mem.size() / 2;
+    vbo->bind_data(mem.data(), mem.size() * sizeof(mem[0]));
+
+    vbo->attribute(0, sizeof(float) * 0, sizeof(float) * 6, GL_FLOAT, 3);
+    vbo->attribute(1, sizeof(float) * 3, sizeof(float) * 6, GL_FLOAT, 3);
+
+    CHECK_GL(glDrawArrays(GL_TRIANGLE_STRIP, 0, vertex_count));
+
+    vbo->disable_attribute(0);
+    vbo->disable_attribute(1);
+    vbo->unbind();
+}
 
 void drawCube(vec3f pos, vec3f a, vec3f b, vec3f color, float size, std::unique_ptr<Buffer> &vbo) {
     std::vector<vec3f> mem;

zenovis/src/bate/GraphicScaleHandler.cpp

@@ -74,6 +74,12 @@ struct ScaleHandler final : IGraphicHandler {
     std::unique_ptr<Buffer> lines_ebo;
     size_t lines_count;
 
+    static constexpr float cube_factor = 0.08f;
+    static constexpr float axis_factor = 0.8f;
+    static constexpr float square_factor = 0.1f;
+    static constexpr float icircle_factor = 0.2f; // inner circle
+    static constexpr float ocircle_factor = 1.0f; // outer circle
+
     explicit ScaleHandler(Scene *scene_, vec3f &center_, float scale_)
         : scene(scene_), center(center_), scale(scale_), mode(INTERACT_NONE) {
         vbo = std::make_unique<Buffer>(GL_ARRAY_BUFFER);
@@ -113,53 +119,64 @@ struct ScaleHandler final : IGraphicHandler {
         auto y_axis = vec3f(0, 1, 0);
         auto z_axis = vec3f(0, 0, 1);
 
+        auto axis_size = bound * axis_factor;
+        auto cube_size = bound * cube_factor;
+        auto square_size = bound * square_factor;
+        auto icircle_size = bound * icircle_factor;
+        auto ocircle_size = bound * ocircle_factor;
+
         // x axis
         if (mode == INTERACT_NONE || mode == INTERACT_X) {
-            drawAxis(center, x_axis, r, bound, vbo);
-            drawCube(center + bound * x_axis, y_axis, z_axis, r, bound * 0.08f, vbo);
+            drawAxis(center, x_axis, r, axis_size, vbo);
+            drawCube(center + axis_size * x_axis, y_axis, z_axis, r, cube_size, vbo);
         }
 
         if (mode == INTERACT_NONE || mode == INTERACT_Y) {
-            drawAxis(center, y_axis, g, bound, vbo);
-            drawCube(center + bound * y_axis, z_axis, x_axis, g, bound * 0.08f, vbo);
+            drawAxis(center, y_axis, g, axis_size, vbo);
+            drawCube(center + axis_size * y_axis, z_axis, x_axis, g, cube_size, vbo);
         }
 
         if (mode == INTERACT_NONE || mode == INTERACT_Z) {
-            drawAxis(center, z_axis, b, bound, vbo);
-            drawCube(center + bound * z_axis, x_axis, y_axis, b, bound * 0.08f, vbo);
+            drawAxis(center, z_axis, b, axis_size, vbo);
+            drawCube(center + axis_size * z_axis, x_axis, y_axis, b, cube_size, vbo);
         }
 
         if (mode == INTERACT_NONE || mode == INTERACT_YZ)
-            drawSquare(center, y_axis, z_axis, {0.6, 0.2, 0.2}, bound * 0.1f, vbo);
+            drawSquare(center, y_axis, z_axis, {0.6, 0.2, 0.2}, square_size, vbo);
 
         if (mode == INTERACT_NONE || mode == INTERACT_XZ)
-            drawSquare(center, z_axis, x_axis, {0.2, 0.6, 0.2}, bound * 0.1f, vbo);
+            drawSquare(center, z_axis, x_axis, {0.2, 0.6, 0.2}, square_size, vbo);
 
         if (mode == INTERACT_NONE || mode == INTERACT_XY)
-            drawSquare(center, x_axis, y_axis, {0.2, 0.2, 0.6}, bound * 0.1f, vbo);
-
-        if (mode == INTERACT_NONE || mode == INTERACT_XYZ)
-            drawCube(center, y_axis, z_axis, {0.51, 0.17, 0.85}, bound * 0.08f, vbo);
+            drawSquare(center, x_axis, y_axis, {0.2, 0.2, 0.6}, square_size, vbo);
+
+        const auto& view = scene->camera->m_view;
+        if (mode == INTERACT_NONE || mode == INTERACT_XYZ) {
+            // http://www.opengl-tutorial.org/cn/intermediate-tutorials/billboards-particles/billboards/
+            // always face camera
+            // This is equivalent to mlutiplying (1,0,0) and (0,1,0) by inverse(ViewMatrix).
+            // ViewMatrix is orthogonal (it was made this way), 
+            // so its inverse is also its transpose, 
+            // and transposing a matrix is "free" (inversing is slooow)
+            auto right_world = vec3f(view[0][0], view[1][0], view[2][0]);
+            auto up_world = vec3f(view[0][1], view[1][1], view[2][1]);
+            drawCircle(center, right_world, up_world, { 1.0, 1.0, 1.0 }, icircle_size, bound * 0.01f, vbo);
+            drawCircle(center, right_world, up_world, { 1.0, 1.0, 1.0 }, ocircle_size, bound * 0.01f, vbo);
+        }       
     }
 
     virtual int collisionTest(glm::vec3 ori, glm::vec3 dir) override {
         auto x_axis = glm::vec3(1, 0, 0);
         auto y_axis = glm::vec3(0, 1, 0);
         auto z_axis = glm::vec3(0, 0, 1);
 
-        auto model_matrix =glm::translate(zeno::vec_to_other<glm::vec3>(center));
-
-        // xyz handler
-        float cube_size = bound * 0.08f; float t;
-        auto xyz_handler_max = cube_size * glm::vec3(1.0f);
-        auto xyz_handler_min = -xyz_handler_max;
-        if (rayIntersectOBB(ori, dir, xyz_handler_min, xyz_handler_max, model_matrix, t)) {
-            mode = INTERACT_XYZ;
-            return INTERACT_XYZ;
-        }
+        auto model_matrix = glm::translate(zeno::vec_to_other<glm::vec3>(center));
+        const auto& view = scene->camera->m_view;
+
+        float t;
 
         // axis handlers
-        float axis_handler_l = bound * 1.1f;
+        float axis_handler_l = bound * axis_factor;
         float axis_handler_w = bound * 0.1f;
 
         // x handler
@@ -188,7 +205,7 @@ struct ScaleHandler final : IGraphicHandler {
 
         // plane handlers
         float square_ctr_offset = bound;
-        float square_size = bound * 0.1f;
+        float square_size = bound * square_factor;
 
         // xy handler
         auto xy_base = glm::normalize(x_axis + y_axis);
@@ -217,6 +234,19 @@ struct ScaleHandler final : IGraphicHandler {
             return INTERACT_XZ;
         }
 
+        // xyz handler
+        // the other handlers are in the range of xyz handler, so check xyz at last 
+        float i_radius = bound * icircle_factor;
+        float o_radius = bound * ocircle_factor;
+        float thickness = bound * 0.1f;
+        auto right_world = vec3f(view[0][0], view[1][0], view[2][0]);
+        auto up_world = vec3f(view[0][1], view[1][1], view[2][1]);
+        if (rayIntersectRing(ori, dir, glm::vec3(0), o_radius, i_radius, zeno::vec_to_other<glm::vec3>(right_world),
+            zeno::vec_to_other<glm::vec3>(up_world), thickness, model_matrix)) {
+            mode = INTERACT_XYZ;
+            return INTERACT_XYZ;
+        }
+
         mode = INTERACT_NONE;
         return INTERACT_NONE;
     }