fix mixer brush uv2 and tip visibility on touch

src/canvas.cpp

@@ -391,7 +391,10 @@ void Canvas::stroke_draw()
             vertex_t{ {0, 0, 1, 1}, {1, 0}, {1, 0} },
         };
         for (int j = 0; j < 4; j++)
+        {
             B[j].pos = glm::vec4(xy(s.pos) + off[j] * glm::orientate2(-s.angle), 1, 1);
+            B[j].uvs2 = UV2[j];
+        }
 
         glViewport(0, 0, m_width, m_height);
 
@@ -466,9 +469,9 @@ void Canvas::stroke_draw()
                     {
                         inside++;
                     }
+                    //P[j].uvs2 = xy(P[j].pos) / glm::vec2(App::I.width, App::I.height);
                     P[j].pos.x = -(plane_local.x * 0.5f - 0.5f) * m_width;
                     P[j].pos.y = (plane_local.y * 0.5f + 0.5f) * m_height;
-                    P[j].uvs2 = UV2[j];
 
                     // Black magic - BEWARE!
                     // interpolation perspective correction, use the current camera projection to correct the interpolation

src/canvas_modes.cpp

@@ -87,10 +87,15 @@ void CanvasModeBasicCamera::on_GestureEvent(GestureEvent* ge)
 
 ////////////////////////////////////////////////////////////////////
 
+void CanvasModePen::on_GestureEvent(GestureEvent* ge)
+{
+    m_draw_tip = false;
+}
+
 void CanvasModePen::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
 {
 #if defined(__IOS__)
-    m_draw_tip = (me->m_source == kEventSource::Mouse);
+    m_draw_tip = (me->m_source == kEventSource::Mouse && me->m_type != kEventType::MouseUpL);
 #else
     m_draw_tip = (me->m_source == kEventSource::Mouse || me->m_source == kEventSource::Stylus);
 #endif // _WIN32

src/canvas_modes.h

@@ -66,6 +66,8 @@ class CanvasModePen : public CanvasMode
     bool m_resizing = false;
 public:
     CanvasModePen() = default;
+    
+    virtual void on_GestureEvent(GestureEvent* ge) override;
     virtual void on_MouseEvent(MouseEvent* me, glm::vec2& loc) override;
     virtual void on_Draw(const glm::mat4& ortho, const glm::mat4& proj, const glm::mat4& camera) override;
     virtual void enter() override;