Add Ctrl modifier to Shift+pencil to enable angle snap (#1387)

data/gui.xml

@@ -523,6 +523,7 @@
 
       <!-- Modifiers for freehand tool controller  -->
       <key action="StraightLineFromLastPoint" shortcut="Shift" />
+      <key action="AngleSnapFromLastPoint" shortcut="Ctrl" />
 
       <!-- Modifiers for two-points tool controller -->
       <key action="SquareAspect" shortcut="Shift" />

src/app/tools/controller.h

@@ -28,6 +28,7 @@ namespace app {
       virtual bool canSnapToGrid() { return true; }
       virtual bool isFreehand() { return false; }
       virtual bool isOnePoint() { return false; }
+      virtual bool isTwoPoints() { return false; }
 
       virtual void prepareController(ToolLoop* loop) { }
 

src/app/tools/controllers.h

@@ -99,9 +99,7 @@ private:
 // Controls clicks for tools like line
 class TwoPointsController : public MoveOriginCapability {
 public:
-  TwoPointsController(const bool enableModifiers)
-    : m_enableModifiers(enableModifiers) {
-  }
+  bool isTwoPoints() override { return true; }
 
   void pressButton(Stroke& stroke, const Point& point) override {
     MoveOriginCapability::pressButton(stroke, point);
@@ -126,8 +124,7 @@ public:
 
     stroke[1] = point;
 
-    if (m_enableModifiers &&
-        (int(loop->getModifiers()) & int(ToolLoopModifiers::kSquareAspect))) {
+    if ((int(loop->getModifiers()) & int(ToolLoopModifiers::kSquareAspect))) {
       int dx = stroke[1].x - m_first.x;
       int dy = stroke[1].y - m_first.y;
       int minsize = MIN(ABS(dx), ABS(dy));
@@ -172,8 +169,7 @@ public:
 
     stroke[0] = m_first;
 
-    if (m_enableModifiers &&
-        (int(loop->getModifiers()) & int(ToolLoopModifiers::kFromCenter))) {
+    if ((int(loop->getModifiers()) & int(ToolLoopModifiers::kFromCenter))) {
       int rx = stroke[1].x - m_first.x;
       int ry = stroke[1].y - m_first.y;
       stroke[0].x = m_first.x - rx;
@@ -232,7 +228,6 @@ private:
   }
 
   Point m_first;
-  bool m_enableModifiers;
 };
 
 // Controls clicks for tools like polygon
@@ -390,8 +385,6 @@ private:
 // freehand until the mouse is released.
 class LineFreehandController : public Controller {
 public:
-  LineFreehandController() : m_twoPoints(false) { }
-
   bool isFreehand() override { return true; }
 
   gfx::Point getLastPoint() const override { return m_last; }
@@ -414,6 +407,8 @@ public:
   }
 
   bool releaseButton(Stroke& stroke, const Point& point) override {
+    if (!stroke.empty())
+      m_last = stroke.lastPoint();
     return false;
   }
 

src/app/tools/intertwiners.h

@@ -234,6 +234,10 @@ class IntertwineAsPixelPerfect : public Intertwine {
   Stroke m_pts;
 
 public:
+  // Useful for Shift+Ctrl+pencil to draw straight lines and snap
+  // angle when "pixel perfect" is selected.
+  bool snapByAngle() override { return true; }
+
   void prepareIntertwine() override {
     m_pts.reset();
   }

src/app/tools/tool_box.cpp

@@ -115,7 +115,7 @@ ToolBox::ToolBox()
   m_controllers[WellKnownControllers::Freehand] = new FreehandController();
   m_controllers[WellKnownControllers::PointByPoint] = new PointByPointController();
   m_controllers[WellKnownControllers::OnePoints] = new OnePointController();
-  m_controllers[WellKnownControllers::TwoPoints] = new TwoPointsController(true);
+  m_controllers[WellKnownControllers::TwoPoints] = new TwoPointsController();
   m_controllers[WellKnownControllers::FourPoints] = new FourPointsController();
   m_controllers[WellKnownControllers::LineFreehand] = new LineFreehandController();
 

src/app/ui/editor/editor.cpp

@@ -1442,14 +1442,27 @@ void Editor::updateToolLoopModifiersIndicators()
                      int(tools::ToolLoopModifiers::kAddSelection) |
                      int(tools::ToolLoopModifiers::kSubtractSelection)));
 
-      // Shape tools (line, curves, rectangles, etc.)
-      action = m_customizationDelegate->getPressedKeyAction(KeyContext::ShapeTool);
-      if (int(action & KeyAction::MoveOrigin))
-        modifiers |= int(tools::ToolLoopModifiers::kMoveOrigin);
-      if (int(action & KeyAction::SquareAspect))
-        modifiers |= int(tools::ToolLoopModifiers::kSquareAspect);
-      if (int(action & KeyAction::DrawFromCenter))
-        modifiers |= int(tools::ToolLoopModifiers::kFromCenter);
+      tools::Controller* controller =
+        (App::instance()->activeToolManager()->selectedTool() ?
+         App::instance()->activeToolManager()->selectedTool()->getController(0): nullptr);
+
+      // Shape tools modifiers (line, curves, rectangles, etc.)
+      if (controller && controller->isTwoPoints()) {
+        action = m_customizationDelegate->getPressedKeyAction(KeyContext::ShapeTool);
+        if (int(action & KeyAction::MoveOrigin))
+          modifiers |= int(tools::ToolLoopModifiers::kMoveOrigin);
+        if (int(action & KeyAction::SquareAspect))
+          modifiers |= int(tools::ToolLoopModifiers::kSquareAspect);
+        if (int(action & KeyAction::DrawFromCenter))
+          modifiers |= int(tools::ToolLoopModifiers::kFromCenter);
+      }
+
+      // Freehand modifiers
+      if (controller && controller->isFreehand()) {
+        action = m_customizationDelegate->getPressedKeyAction(KeyContext::FreehandTool);
+        if (int(action & KeyAction::AngleSnapFromLastPoint))
+          modifiers |= int(tools::ToolLoopModifiers::kSquareAspect);
+      }
     }
     else {
       // We update the selection mode only if we're not selecting.

src/app/ui/keyboard_shortcuts.cpp

@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2001-2016  David Capello
+// Copyright (C) 2001-2017  David Capello
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -44,6 +44,7 @@ namespace {
     { "SubtractSelection"   , "Subtract Selection" , app::KeyAction::SubtractSelection },
     { "AutoSelectLayer"     , "Auto Select Layer"  , app::KeyAction::AutoSelectLayer },
     { "StraightLineFromLastPoint", "Straight Line from Last Point", app::KeyAction::StraightLineFromLastPoint },
+    { "AngleSnapFromLastPoint", "Angle Snap from Last Point", app::KeyAction::AngleSnapFromLastPoint },
     { "MoveOrigin"          , "Move Origin"      , app::KeyAction::MoveOrigin },
     { "SquareAspect"        , "Square Aspect"      , app::KeyAction::SquareAspect },
     { "DrawFromCenter"      , "Draw From Center"   , app::KeyAction::DrawFromCenter },
@@ -158,6 +159,7 @@ Key::Key(KeyAction action)
       m_keycontext = KeyContext::MoveTool;
       break;
     case KeyAction::StraightLineFromLastPoint:
+    case KeyAction::AngleSnapFromLastPoint:
       m_keycontext = KeyContext::FreehandTool;
       break;
     case KeyAction::MoveOrigin:

src/app/ui/keyboard_shortcuts.h

@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2001-2016  David Capello
+// Copyright (C) 2001-2017  David Capello
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -71,6 +71,7 @@ namespace app {
     SquareAspect              = 0x00001000,
     DrawFromCenter            = 0x00002000,
     ScaleFromCenter           = 0x00004000,
+    AngleSnapFromLastPoint    = 0x00008000,
   };
 
   inline KeyAction operator&(KeyAction a, KeyAction b) {