Mega Man (lsmmega/mm1)

A fresh A press on the ground sets Mega Man's upward speed to $04.$DF, 4.87 px/frame. mega-man/jump-speed

About: Mega Man Jump

Value: 1247 1/256 px/frame

1247/256 = 4.87109375 px/frame.

Cited by: Mega Man

Each airborne frame takes $40/256 = 0.25 px/frame off Mega Man's upward speed, and a fall is capped at 12 px/frame ($F4). mega-man/gravity

About: Mega Man Gravity

Value: 64 1/256 px/frame²

Cited by: Mega Man

On every rising frame with A not held, Mega Man's upward speed, if its whole part is 2 or more, drops to exactly 1 px/frame; the test follows the frame's vertical move. mega-man/release-cap

About: Mega Man Variable jump height

Value: 256 1/256 px/frame

Cited by: Mega Man

Off ice, Mega Man never accelerates. Each frame his animation picks a speed from special_object_xcoord_speed_table, 0 standing, 0.125 px/frame on the first step, 1.375 running, 0.5 sliding to a stop, 0 landing, and 0.5625 when hit; any other animation, such as the jump, moves at 1.3125 with a direction held and 0 without. mega-man/state-speeds

About: Mega Man Running

{
 "standing": 0,
 "step": 32,
 "running": 352,
 "jumping": 336,
 "slide": 128,
 "landing": 0,
 "hit": 144
}

Ice keeps a second speed that carries over and decays (zice_xcoord_speed, L23-L71); it isn't covered here.

Cited by: Mega Man, Mega Man (classic series)

A hit sets zmegaman_invincibility_time to 111 ($6F); while it is nonzero no contact damages Mega Man, and the stage loop counts it down by 1 on each pass that runs the enemies. mega-man/i-frames

About: Mega Man Invincibility frames

Value: 111 frames

The loop skips the countdown when Mega Man's flag nibble equals can_collide_map (L41-L44); the atlas hasn't traced when that happens, so the count is in loop passes, not measured frames.

Cited by: Mega Man

A hit faces Mega Man against the enemy's facing and puts him in the hit animation ($12), which sets his upward speed to 1.25 px/frame ($01.$40) once and pushes him backward, against his own facing, at 0.5625 px/frame ($90) under the usual gravity until the animation ends. mega-man/knockback

About: Mega Man Knockback

{
 "up": 320,
 "back": 144
}

The push runs while aobject_frameset_timer is nonzero, so its length is the hit animation's; the atlas hasn't read or measured that length.

Cited by: Mega Man

Mega Man 2 keeps Mega Man's jump and running numbers. Both take off at $04.$DF, subtract $40 of gravity a frame, cap a fall at $F4, cut a rise of 2 px/frame or more to 1 when A is up, and move at 0.125, 1.375, and 1.3125 px/frame stepping, running, and in the air. mega-man/keeps-into-mm2

About: Mega Man Jump

Mega Man 2 adds a water column (jump $05.$80, gravity $1E) that Mega Man doesn't have.

Cited by: Mega Man, Mega Man 2

Mega Man 2 keeps Mega Man's hit numbers too, 111 frames of invincibility ($6F) and a knockback of 1.25 px/frame up and 0.5625 back. mega-man/hit-into-mm2

About: Mega Man Knockback

Cited by: Mega Man, Mega Man 2

_objects_vertical_moving first moves Mega Man by his 8.8 fixed-point vertical speed, positive up (his Y, which runs down the screen, subtracts it), and then, on a frame that meets no floor or ceiling, takes gravity off the speed. mega-man/motion-order

About: Mega Man Gravity

Mega Man's fall is capped at 12 px/frame ($F4). mega-man/max-fall

About: Mega Man Gravity

Value: -12 px/frame

Mega Man's position is his center; the floor and ceiling are tested at x − 7 and x + 7, 12 px below or above it, and walls at x + 8 or x − 8, toward his facing, at 12 px and 4 px above and 11 px below it. Every animation he has on foot or in the air uses these offsets. mega-man/terrain-box

About: Mega Man Hitbox

{
 "floor": {
  "x": [
   -7,
   7
  ],
  "y": 12
 },
 "ceiling": {
  "x": [
   -7,
   7
  ],
  "y": -12
 },
 "wall": {
  "x": 8,
  "y": [
   -12,
   -4,
   11
  ]
 }
}

The tables are indexed by the animation, but every one of Mega Man's has the same entries, so his box never changes shape.

_check_special_blockset_or_tsa_collision turns a test point into a tile: X / 32 and Y / 32 pick a 32 px block of the screen's map, bit 4 of Y and of X pick one of its four 16 px tiles, and the tile's top two bits give its kind through a per-stage table: background, block, and two of ladder, spike, ice, and water. mega-man/tile-lookup

About: Mega Man Hitbox

Value: 16 px

Each frame on foot or in the air, _run_megaman_on_stage moves Mega Man horizontally first, testing for a wall, then vertically, testing the floor under a fall or the ceiling over a rise, and only then checks for a jump or lands, runs, slides, or stands, so a frame's floor test uses that frame's new X. The one change made before the move is a Left or Right pressed fresh, which sets the first step's animation (ground-states). mega-man/collision-order

About: Mega Man Hitbox

Every frame that finds a floor under him sets Mega Man's vertical speed to $FF.$40, −0.75 px/frame, with no gravity after it, so each grounded frame's vertical move takes him 0.75 px down and tests x − 7 and x + 7 on the row under his feet; ground there puts him back on it with the Y fraction zeroed, and none starts a fall. mega-man/ground-check

About: Mega Man Coyote time

Value: -192 1/256 px/frame

Mega Man 2 keeps −0.25 px/frame on the ground instead (mega-man-2/ground-check).

When a falling Mega Man's floor points find a block, _objects_vertical_moving sets his Y to the top of that 16 px tile less 12, which puts his feet on it, zeroes the Y fraction, and sets the speed to −0.75 px/frame (ground-check); so a fall of up to 12 px a frame always ends on the top of the tile it meets. mega-man/floor-snap

About: Mega Man Jump

Mega Man first counts as airborne on the frame whose move takes both floor points off the ledge; that frame still moves him at the ground animation's speed, drops him 0.75 px, and leaves him falling at 1 px/frame in the jumping animation, so his feet are 0, 1, 3, 4, 6, 8, and 10 px below the ledge on the walk-off frame and the six after. mega-man/walk-off

About: Mega Man Coyote time

{
 "drop": 192,
 "v": -256,
 "heights": [
  0,
  -1,
  -3,
  -4,
  -6,
  -8,
  -10,
  -13,
  -15,
  -18,
  -22,
  -25,
  -29
 ]
}

Mega Man 2 drops 0.25 px and falls at 0.5 px/frame from the next (mega-man-2/walk-off).

Mega Man gets no grace window after leaving a ledge; _run_megaman_on_stage reads a fresh A press only on the branch where the frame's fall test found ground, either the map's floor or an object he stands on (_no_damage_collision). mega-man/no-coyote-time

About: Mega Man Coyote time

When the horizontal move puts the wall point ahead in a solid tile, _objects_rightward or _objects_leftward puts x + 8 on that tile's first column moving right, or x − 8 on the first column past it moving left, and keeps the X fraction of the move; his speed and animation are untouched, so he runs in place. mega-man/wall-stop

About: Mega Man Hitbox

Mega Man 2 zeroes the X fraction on the push (mega-man-2/wall-stop).

When a rising Mega Man's move puts a ceiling point, x − 7 or x + 7 at 12 px above his center, in a block, _objects_vertical_moving puts that point on the first row under the block's 16 px tile, zeroes the Y fraction, and sets his speed to −0.75 px/frame, the speed a landing gets; _run_megaman_on_stage then returns before the release test and before setting the jumping animation, and he falls from the next frame. Measured in Mesen at the start of Bomb Man's stage, under 16 px blocks that the probe adds to the stage's collision. mega-man/ceiling-hit

About: Mega Man Hitbox

Value: -192 1/256 px/frame

Mega Man 2 leaves −0.25 px/frame after the hit (mega-man-2/ceiling-hit). On 16 px tiles the hit can't come on the first frame of a rise from the floor, which would leave the ground animation set, since standing, his top is 8 px into a tile row and the first rise is 4.87 px.

No grounded frame tests the ceiling, since Mega Man's vertical speed on the ground is −0.75 px/frame (ground-check) and the vertical move tests only the floor at a negative speed; the jump press then sets the jump speed without testing the ceiling, so a press under a block still starts the jump, and the rise meets the block on a later frame. Measured in Mesen at the start of Bomb Man's stage, under a 16 px block the probe adds to the stage's collision. mega-man/jump-under-ceiling

About: Mega Man Jump

Mega Man's animation is his state. A Left or Right pressed fresh, with neither held the frame before, starts the first step ($03) with its timer at 0, on the ground or in the air; each frame on the ground after the move, a held direction turns the step into the run ($06) once its timer reads $22, and lands a jump running; a direction let go turns a run into the slide to a stop ($0C, timer 1) and anything else into standing; with no direction this frame or the last, a jump lands into the landing animation ($0F, timer 1), and the slide and the landing end in standing when their timer wraps to 0. mega-man/ground-states

About: Mega Man Running

Mega Man 2 keeps the same six states as numbered states with their own routines and changes the step and the slide at fixed animation frames (mega-man-2/ground-states).

After Mega Man's frame, _object_frameset_timer advances his animation's timer from the frameset's first byte: the low nibble counts up to the byte's low nibble, then the high nibble moves to the next animation frame or wraps to 0 after the last. The first step shows 3 frames for 3 frames each; the press frame sets its timer to 0 and the ground check reads it before that frame's advance, so the check first finds $22 on the step's 9th frame; the slide shows 2 frames for 7 each (8 in the shooting pose), and the landing 2 frames for 2 each. mega-man/animation-timer

About: Mega Man Running

{
 "standing": [
  8,
  10
 ],
 "step": [
  2,
  2
 ],
 "running": [
  6,
  3
 ],
 "jumping": [
  0,
  0
 ],
 "slide": [
  6,
  1
 ],
 "landing": [
  1,
  1
 ],
 "slideShooting": [
  7,
  1
 ]
}

The run's and the standing animation's timers decide nothing about movement; the model keeps them only to step the same bytes as the game.

Measured from a standstill at the start of Bomb Man's stage, Mega Man's first step lasts 9 frames at 0.125 px/frame, and a released run slides 13 frames at 0.5 px/frame, 6.5 px in all, before he stands; a jump landed with nothing held shows the landing animation for 3 frames. mega-man/ground-measured

About: Mega Man Running

{
 "stepFrames": 9,
 "slideFrames": 13,
 "slide": 128,
 "landingFrames": 3
}

Mega Man 2's first step lasts 7 frames and its slide 8 (mega-man-2/ground-measured).

Cited by: Mega Man

A buster shot sets aobject_timer to $1F, which shows Mega Man's shooting animations for 15 frames, counting the press frame; their framesets time the slide to a stop at 8 frames per animation frame instead of 7, so a shot fired shortly before or during the slide lengthens it. A Left or Right pressed fresh clears the pose. mega-man/shot-pose

About: Mega Man Running

Value: 15 frames

The buster fires only while one of the three shot slots (objects 2-4) is free; the pose comes only with a shot.

Each frame _change_direction faces Mega Man toward a held Left or Right before his speed is looked up and he moves, so he reverses at full speed with no skid; a reversal from one held direction to the other isn't a fresh press, so a run stays a run. mega-man/turn-instant

About: Mega Man Running

A jump press returns before the animation changes, and the jumping animation is set only after the next frame's move, so the press frame and the one after both move at the ground animation's speed (two frames of 1.375 px/frame from a run, of 0.125 from a first step, and none from standing still); from the third frame the air speed applies. mega-man/takeoff-x

About: Mega Man Jump

Mega Man 2 changes state on the press frame, so only that frame moves at the ground speed (mega-man-2/takeoff-x).

In the air the jumping animation isn't in the speed lookup's table, so each frame sets Mega Man's speed to 1.3125 px/frame ($01.$50) toward a held Left or Right and to 0 with neither; a direction pressed fresh in the air first sets the first step's animation, so that one frame moves 0.125 px/frame. mega-man/air-speed

About: Mega Man Air control

Value: 336 1/256 px/frame

Mega Man 2 has no fresh-press frame in the air (mega-man-2/air-speed).

Mega Man lands running, at 1.375 px/frame from the next frame with no first step, only if Left or Right is held on the landing frame itself; with the direction let go on that frame he lands standing, and with nothing held then or the frame before he lands into the landing animation, which moves no faster than standing. A direction pressed fresh on the landing frame starts the first step. mega-man/landing

About: Mega Man Jump

Mega Man 2 reads the frame before the landing instead (mega-man-2/landing).

Down changes nothing on open ground; _megaman_on_stage reads Up and Down only when a ladder tile is at hand. mega-man/down-on-ground

About: Mega Man Running

Mega Man's ordinary-floor movement differs from Mega Man 2's, measured in Mesen at the start of Bomb Man's stage and of Heat Man's. The first difference: holding Right from a standstill, Mega Man is still in his first step on the 8th frame, moving 0.125 px, where Mega Man 2 runs at 1.375. After it: a slide of 13 frames, not 8; two frames at the ground speed after a jump press, not one; a landing that runs only with a direction held on the landing frame, not the frame before; 0.125 px/frame on a fresh press in mid-air; −0.75 px/frame on the ground, not −0.25, so a walk-off and a ceiling hit fall faster; and a wall push that keeps the X fraction. mega-man/movement-differs-from-mega-man-2

About: Mega Man Running

Cited by: Mega Man, Mega Man (classic series)