Diff: Walker.cpp

Revision:

7:e72691603fd3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Walker.cpp	Sat Jun 08 16:44:54 2013 +0000
@@ -0,0 +1,64 @@
+/*
+ * SOURCE FILE : Walker.cpp
+ *
+ * Methods for objects that walk sideways on (like humans and crushers).
+ * 
+ */
+
+#include "Gameduino.h"                    // Gameduino stuff
+#include "GDConst.h"
+#include "Walker.h"
+#include "Random.h"
+
+/*************************************************/
+/* INITIALISE HORIZONTAL AND VERTICAL VELOCITIES */
+/*************************************************/
+// Pass pointers to horizontal and vertical velocities in hv and vv.
+void Walker::InitialiseVelocities( Int16 *hv, Int16 *vv ) {
+  // Initialise horizontal and vertical speeds.
+  UInt8 rnd = Random::Get( 4 );
+  *hv = GameObject::FromPixel( 1 ) >> 2;
+  if( rnd & 1 ) {
+    *hv = -(*hv);
+  }
+  *vv = GameObject::FromPixel( 1 ) >> 4;
+  if( rnd & 2 ) {
+    *vv = -(*vv);
+  }
+}
+
+/*********************************************************/
+/* UPDATE COORDINATES AND VELOCITIES TO MAKE OBJECT WALK */
+/*********************************************************/
+// Pass pointers to x and y coordinates in x and y.
+// Pass pointers to horizontal and vertical velocities in hv and vv.
+// Pass restriction flags (as defined in GameObject.h) in restriction Flags.
+void Walker::Walk( Int16 *x, Int16 *y, Int16 *hv, Int16 *vv, UInt8 restrictionFlags ) {
+    // Make object bounce of edges of restriction area.
+    if( restrictionFlags & (UInt8)( GameObject::LeftRestriction | GameObject::RightRestriction ) ) {
+      *hv = -(*hv);
+    }
+    if( restrictionFlags & (UInt8)( GameObject::UpRestriction | GameObject::DownRestriction ) ) {
+      *vv = -(*vv);
+    }
+    *x += *hv;
+    *y += *vv;
+}
+
+/*************************/
+/* DRAW A WALKING OBJECT */
+/*************************/
+// Pass pointer to Gameduino to draw on in gd.
+// Pass sprite number in spriteNumber.
+// Pass x and y coordinates in x and y (NOT pixel coordinates).
+// Pass counter used to pace animation in frameCounter.
+// Pass pointer to animation data (array of AnimationStages sprite image numbers) in animationData.
+void Walker::Draw( Gameduino *gd, UInt8 spriteNumber, Int16 x, Int16 y, Int16 hv, UInt8 frameCounter, const UInt8 *animationData ) {
+    // Reverse sprite image horizontally if horizontal speed is positive.
+    Gameduino::Rotation transform = ( hv < 0 ) ? Gameduino::None : Gameduino::FlipX;
+    // Image number changes with the frame counter.
+    const UInt8 *address = animationData + frameCounter % AnimationStages;
+    // Update sprite location and image. Note the last parameter is BadGuy so that it is possible
+    // for player to collide with a human. GoodGuy would mean collisions would be ignored.
+    gd->sprite( spriteNumber, GameObject::ToPixel( x ), GameObject::ToPixel( y ), *address, 0, transform, BadGuy );
+}