Added rotation

1 files changed, 98 insertions, 0 deletions

diff --git a/source/playerObject.c b/source/playerObject.c
new file mode 100644
index 0000000..3d7ec05
--- /dev/null
+++ b/source/playerObject.c
@@ -0,0 +1,98 @@
+#include "../include/playerObject.h"
+
+void initializePlayerObject (playerObject *object) {
+	// Initialize the point and velocity of a player object
+	object->vel = createVelocity(0, 0);
+	object->pt = createPoint(20 << FIX_SHIFT, 100 << FIX_SHIFT);
+}
+
+playerObject createPlayerObject (OBJ_ATTR *obj_buffer, OBJ_AFFINE *affine_buffer, int pallete_bank, int tile_id) {
+	// Create a player object from data
+	obj_affine_identity(affine_buffer);
+	playerObject temp;
+	initializePlayerObject(&temp);
+	temp.rotation = 0;
+	temp.obj = obj_buffer;
+	temp.affine = affine_buffer;	
+	temp.pallete_bank = pallete_bank;
+	temp.tile_id = tile_id;
+	temp.isJumping = 0;
+	obj_set_attr(temp.obj,
+			ATTR0_SQUARE | ATTR0_AFF | ATTR0_AFF_DBL_BIT, // Set attribute 1 to be a square using affine
+			ATTR1_SIZE_16 | ATTR1_AFF_ID(0), // Set size to 16 x 16
+			ATTR2_PALBANK(pallete_bank) | tile_id // Which pallete to use, as we are in 
+			// 16-color mode
+	);
+	obj_set_pos(temp.obj, temp.pt.x >> FIX_SHIFT, temp.pt.y >> FIX_SHIFT);
+	return temp;
+}
+
+void applyGravity (playerObject *object) {
+	// Apply a gravity constant to a player
+	object->vel.dy += float_to_fixed(GRAVITY);
+	// This is a weird convention to have gravity in the positive direction,
+	// but I don't want to deal with coordinate changing. Too lazy
+}
+
+void scalePlayer (playerObject *object, u32 scaleX, u32 scaleY) {
+	// Scale the player's sprite
+	// Maximum 0.5
+	object->affine->pa = scaleX;  object->affine->pb = 0     ;
+	object->affine->pc = 0     ;  object->affine->pd = scaleY;
+}
+
+void rotatePlayer (playerObject *object) {
+	// Rotate the player's sprite
+	int sinAlpha = lu_sin(object->rotation >> 4) >> 4;
+	int cosAlpha = lu_cos(object->rotation >> 4) >> 4;
+
+	object->affine->pa = cosAlpha; object->affine->pb =-sinAlpha;
+	object->affine->pc = sinAlpha; object->affine->pd = cosAlpha;
+}
+
+u32 roundToNearest90Degrees(u32 rotation) {
+	// Round a rotation to the nearest 90 degree equivalent of "binary radians"
+	// (Where 2pi = 0xFFFF and 0pi = 0)
+	u32 twoPi = 0xFFFF << 4;
+	u32 pi = 0x8000 << 4;
+	u32 halfPi = 0x4000 << 4;
+	u32 quarterPi = 0x2000 << 4;
+
+	
+	if (rotation > quarterPi && rotation < 3 * quarterPi) {
+		return halfPi;
+	}
+	else if (rotation > 3 * quarterPi && rotation < (pi + quarterPi)) {
+		return pi;
+	}
+	else if (rotation > (pi + quarterPi) && rotation < (pi + 3*quarterPi)) {
+		return pi + halfPi;
+	}
+	else if (rotation < quarterPi || rotation > (twoPi - quarterPi)) {
+		return 1;
+	}
+	return 1;
+}
+
+void updatePlayer (playerObject *object, u32 GROUND_LEVEL) {
+	// Update the position of a player object
+	updatePoint(&object->pt, &object->vel);
+	if (object->pt.y >> FIX_SHIFT >= GROUND_LEVEL) {
+		// Only apply gravity if player is not touching the ground
+		object->isJumping = 0;
+		object->pt.y = GROUND_LEVEL << FIX_SHIFT; // Don't go through ground
+		object->vel.dy = 0;
+		object->rotation = roundToNearest90Degrees(object->rotation);
+	}
+	else {
+		object->isJumping = 1;
+		applyGravity(object);
+		object->rotation += 100 << 8;
+	}
+	rotatePlayer(object);
+	// Update the player object's attributes' position
+	obj_set_pos(object->obj, object->pt.x >> FIX_SHIFT, object->pt.y >> FIX_SHIFT);
+	// Update the player's second attribute (tile and pallete bank)
+	object->obj->attr2 = ATTR2_BUILD(object->tile_id, object->pallete_bank, 0);
+}
+