I’ve been on fever for several days now, when I’m writing this. Nevertheless, now Calculus is at version 3.2.0 beta. Finally saving to Pictures folder work properly — also in later (>=6) Android versions.
One new feature is also possibility to make y limits equal to x limits With this button one can get results like this:
The video below is recorder directly from my phones screen:
Let’s see if I manage to implement some new features to Calculus in near future.
I’d like to tell, why and what kind of bugs there were in my Android game Easy Math Challenge in its early versions.
The smallest bug was that there was “difficulty level 0”. If the user tapped somewhere else than the difficulty level buttons, the game gave “puzzles” like “3 = 3”. Well, those “puzzles” were always correct. This was fixed later.
The more annoying bug was, that in early versions the puzzles sometimes might be impossible.
The reason for that was, that I’ve used numbers also for the operations of puzzles. If for example + (plus) was 45, while calculating the result, the result got wrong so that 45 was part of the calculation numbers, not an operation. This was fixed later.
Video of the version 1.7.2 (no known bugs):
I wrote the program from scratch without any planning and often the usual mistake of mine: Work was done too at too late of hours.
If you still find some bugs, please let me know.
I published recently initial version 1.0 of a calculus program called Calculus to Android. I have plans to publish PC version too, when the program is developed further.
The program differentiates and integrates user given polynomial and simplifies all the fractions. The coefficients can be 4 digits long. I haven’t given a limit to amount of terms in the polynomial, the available memory is the only limit.
The coefficients can be fractional too — and of course negative or positive. Next version will be out soon, which will improve some features of the program and add some features too. I’m not aware of any actual bugs in the program at the moment.
See below a demonstration video of the program (in the video Calculus is compiled to PC and used with the mouse):
Calculus is free educational program.
Notice that when integrating the polynomial, Calculus doesn’t give the integral constant.
Memorable Melodies v1.3 is written in Monkey2 programming language. Now it is tested to be working properly on newer Android devices!
Remember there is a cheat in the game: Tap at the upper right corner of the screen and all the mistakes are cleared.
In the code now MusicState() isn’t tested at all, instead the duration of the played music.
Do try it! 🙂 It’s free witout adds.
This game project started in the year 2015. A long time passed I’m doing nothing for the game, but finally its ready and published!
The project started with Monkey X, but I finished it with Cerberus X and compiled it to Android. I have not — at least not yet — plans for a free PC version.
Before publishing I ran the tests that Google offers for the app. My app passed with zero crashes. 🙂
You might want to take a look at the game played with PC in the video above.
Like I wrote in “Shorty about computer playing history” post, if I’m ever to create a game, it would always have an ending and so does this game have.
The game is free (no ads) you might want to try it with your Android device, search for “Memorable Melodies” on Google Play. Or get here:
I hope you like it!
I’m living in the past too much, such speaking. This reminds me what Yoda said to Luke Skywalker in episode V: ”Always he has looked into the horizon, never where he was, what he was doing!”. Or something like that.
I started 2015 an Android game project, I haven’t touched for a long time. Much have changed since I started that project. The pro version of Monkey X saw many updated versions with mojo2-module while I was using old mojo-module in my project.
Later I updated the code for mojo2, but how fast the time flies: Monkey X has gone completely open source and I don’t even know when that happened… Today I installed latest open source version of Monkey X from Blitz Research.
But since I seem to live in the past, I’m going to find time to finish my Android game with old Monkey X (with mojo2).
What’s well.. ”special” in this game is, that all the musics will be composed by me. Though, I haven’t been making so called tracker music ”seriously” (if ever) for a long time… Though, for testing this game project I will be working again, I already have made four short tracker music compositions last year – and one short piece of music made with PC’s ProTrekkr.
Though, to pity for the potential players of this game, I probably must compose new tunes… 🙂
When finished, the game will be free.
It’s night when I’m writing this. I came up with a little Monkey X tutorial on how to program the bouncing of the ball, when it touches the bat in the “old school way” — like in the popular C64 game Krakout in the 80s.
In the video for the tutorial you can see, that as the ball touches the bat for the first time, delta y doesn’t change. This is because both the ball and the bat are uneven as height in pixels; now both the ball and the bat have a middle point.
This is just a short piece of code, that doesn’t handle the case, when the ball is at the horizontal top or bottom of the bat. There’s some extra work for anyone who wants to make an 80s style Krakout game. 🙂
The delta y for the ball is calculated simply how the ball’s y-position is related to the middle point to the bat. The “scale” variable is used to adjust the max y-speed of the ball.
Source code below:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 |
Import mojo Function Main() New MyApp End Class MyApp Extends App Field gfxBG:Image, gfxBat:Image, gfxBall:Image Field scaleX:Float, scaleY:Float Field touchX:Float, touchY:Float Field prevTX:Float, prevTY:Float Field batY:Float Field ballX:Float, ballY:Float Field ballDX:Float, ballDY:Float Field scale:Float Method OnCreate() ' Load graphics gfxBG = LoadImage("bg2.png") gfxBat = LoadImage("bat3.png") gfxBall = LoadImage("ball4.png") SetDeviceWindow(640,480,0) scaleX = DeviceWidth() / 640.0 scaleY = DeviceHeight() / 480.0 ballX = 42 batY = 230 ballY = 230 + 36 - 8 ballDX = 2 ballDY = 0 prevTY = 0 touchY = 0 touchX = 0 touchY = 0 scale = 16 End Method OnUpdate() ' The if-sentence prevents the bat to appear at bottom of the screen at the start.. If prevTY <> 0 Then batY = batY - (prevTY - touchY) prevTY = touchY touchY = TouchY() touchY = touchY / scaleY ' Keep the bat in the borders of the screen If batY < 0 Then batY = 0 If batY > 479 - 72 Then batY = 479 - 72 ' Move the ball ballX = ballX + ballDX ballY = ballY + ballDY ' Keep the ball in the borders of the screen If ballY < Abs(ballDY) Then ballDY = -ballDY If ballY > 479 - 17 Then ballDY = -ballDY If ballX < -Abs(ballDX) Then ballDX = -ballDX If ballX > 639 - Abs(ballDX) - 16 Then ballDX = -ballDX ' Calculate the deltaY value for the ball in the "old school way"... If ballX >= 601 - 16 And ballY + 16 > batY And ballY < batY + 72 Then ballDY = -((batY + 36) - (ballY + 8)) / scale ballDX = -ballDX Endif End Method OnRender() PushMatrix() Scale(scaleX,scaleY) DrawImage gfxBG,0,0 DrawImage gfxBall, ballX, ballY DrawImage gfxBat, 601, batY PopMatrix() End End Class |
Feel free to use and improve the source above in your own projects.
Here’s the graphics to download (license: public domain), except the background picture (right click and save as…):
The bat is 32 x 73 pixels as size, the ball is 16 x 17 pixels.
For comparing to the C64’s popular Krakout, see the video below:
Link: Monkey X (from itch.io), it’s free.
Many years ago I started to program Krakout style game in the spirit of the good old Commodore 64, but as usual, something went wrong. Three months work with multiple levels and a level editor programmed in Blitz3D were lost because I hadn’t taken backups of the files, when I, well, “fixed” the Windows installation I had at the time…
A little tutorial on scrolling a picture that is larger than the visible area of the screen in Monkey X.
In this example we will be using a picture of 1280 x 960 pixels in “native” resolution of 640 x 480 pixels. The source is primarily meant to Android target but works for example to desktop target too.
The picture is scrolled by moving a finger on the Android device. In order to avoid the picture to “jump” after not scrolling the picture, variables related to scrolling speed must be set to zero.
Lets have a look at the source code:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 |
Import mojo Function Main() New MyApp End Class MyApp Extends App Field bg:Image Global touchX,touchY:Float Global prevTX,prevTY:Float Global scaleX,scaleY:Float Global scrollX,scrollY:Float Global touchXD,touchYD:Float Global scroll:Bool Method OnCreate() ' Change this to picture, you want to use bg = LoadImage("bg1280x960.png") SetDeviceWindow(640,480,0) scaleX = DeviceWidth() / 640.0 scaleY = DeviceHeight() / 480.0 End Method OnUpdate() touchX = TouchX() touchY = TouchY() touchX = touchX / scaleX touchY = touchY / scaleY If TouchDown(0) > 0 Then If scroll = True Then ' touchXD & touchYD variables prevent the picture ' to "jump", if scrolling is stopped and user then ' touches somewhere on the screen touchXD = touchX touchYD = touchY Else ' if not scrolling, values below are set to zero, ' because when the scrolling starts again, otherwise ' scrollX & scrollY could change too much because of ' values of previous scrolling touchXD = 0 touchYD = 0 prevTX = 0 prevTY = 0 Endif scroll = True scrollX = scrollX - (touchXD - prevTX) scrollY = scrollY - (touchYD - prevTY) prevTX = touchX prevTY = touchY Else scroll = False Endif End Method OnRender() PushMatrix() Scale(scaleX,scaleY) If scrollX > 0 Then scrollX = 0 If scrollX < -(1280 - 640) + 1 Then scrollX = -(1280 - 640) + 1 If scrollY > 0 Then scrollY = 0 If scrollY < -(960 - 480) + 1 Then scrollY = -(960 - 480) + 1 DrawImage bg,scrollX,scrollY PopMatrix() End End Class |
Examine the source code and learn. Source code license: Public Domain.
Below is a video related to this post:
Again, some nostalgia. In older blog post I presented a shortened version of my old implementation of Amiga’s “Missile Attack”. This night I made the game in Monkey X and the source can be directly compiled to Android target.
The game is quite simple one: Just shoot the missiles before they get to the bottom of the screen.
If a missile goes to the left or right side of the screen, you see the colors of the background changing — and also when you fire a shot. This gives the game more life. 🙂
Below is the source code:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 |
Import mojo2 Function Main() New MyApp End Class Missile Field x:Float ' x-coordinate of a missile Field y:Float ' y-coordinate of a missile Field startx:Float Field addx:Float ' the color of the missile Field red:Float Field green:Float Field blue:Float End Class Class MyApp Extends App Field bg:Image Global canvas:Canvas Global nrOfMissiles:Int Global mx:Float, my:Float Global shot:Bool Global gameOver:Bool = False Global px:Float, py:Float, pr:Float Global scalex:Float, scaley:Float Global missileList := New List<Missile> ' build a missile list Method OnCreate() SetDeviceWindow(640,480,0) canvas = New Canvas shot = False nrOfMissiles = 0 bg = Image.Load("bg.png",0,0) scalex = DeviceWidth() / 640.0 scaley = DeviceHeight() / 480.0 SetUpdateRate(60) End Method OnUpdate() If gameOver = False Then If nrOfMissiles < 8 Then Local mssl:Missile = New Missile mssl.x = Rnd(100,539) mssl.startx = mssl.x mssl.y = 0 mssl.addx = Rnd(-2,2) mssl.red = Rnd(0.2,1) mssl.green = Rnd(0.2,1) mssl.blue = Rnd(0.2,1) missileList.AddLast(mssl) nrOfMissiles = nrOfMissiles + 1 Endif If TouchHit(0) > 0 Then mx = TouchX() / scalex my = TouchY() / scaley pr = 4 px = mx py = my shot = True Endif Endif End Method OnRender() canvas.PushMatrix() canvas.Scale(scalex, scaley) canvas.DrawImage bg,0,0 If gameOver = False Then If nrOfMissiles > 0 Then For Local mssl:Missile = Eachin missileList If mssl <> Null Then canvas.SetColor mssl.red,mssl.green,mssl.blue canvas.DrawLine(mssl.startx,0,mssl.x,mssl.y) mssl.y = mssl.y + 1 If mssl.y >= 479 Then gameOver = True mssl.x = mssl.x + mssl.addx If mssl.x < 0 Or mssl.x > 639 Then missileList.Remove(mssl) nrOfMissiles = nrOfMissiles - 1 Endif Endif Next Endif If shot = True Then canvas.SetColor 0,0,1 canvas.DrawCircle(px,py,pr) Endif If shot = True And pr < 50 Then pr = pr + 1 Else shot = False For Local mssl:Missile = Eachin missileList Local removeMissile:Bool = False If mssl <> Null And shot = True Then ' Mathematical way to determine if player's shot has hit the missile... For Local angle:Int = 0 To 360 If Abs((px + Cos(angle) * pr) - mssl.x) <= 1 And Abs((py + Sin(angle) * pr) - mssl.y) <= 1 Then removeMissile = True score = score + 1 Exit Endif Next If removeMissile = True Then missileList.Remove(mssl) nrOfMissiles = nrOfMissiles - 1 Endif Endif Next Else canvas.SetColor 1,1,1 canvas.DrawText "Game Over",(640 - 9 * 8) / 2, (480 - 8) / 2 Endif canvas.Flush() canvas.PopMatrix() End End Class |
Source code license: GNU General Public License 3.0.
Below is the video of the game on Android tablet and on computer screen:
I may make a better version of the game later on this summer…
(Updated 03/05/2017 with improved source code and new video)
A little update to older post. As the title of the post says we’re making a worm game (in Monkey X). In this version the worm is controlled by touching the screen keeping in mind that the game is really aimed to Android.
I’ll explain here how the worm is controlled.
If you move your finger ”up” from the worm’s head, the worm goes to that direction and respectively to other directions.
See the video below:
The direction is determined by comparing two subsequent update rounds’ TouchX() and TouchY() coordinates.
The test can’t be straightforward TouchX() or TouchY() test, because the player probably won’t move his/her finger absolutely to one of the four directions the worm is to be controlled.
This is why there is another test in controlling the worm: The absolute values of difference of the two subsequent update round’s TouchX() and TouchY() coordinates. If the player wants to control the worm ”up”, the player probably has moved his/her finger more vertically than horizontally.
See the source code:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 |
Import mojo Function Main:Int() New MyApp Return 0 End Class MyApp Extends App Const STARTSCREEN = 0 Const PLAY = 1 Field gfxBG:Image Const BG_WIDTH:Int = 640 Const BG_HEIGHT:Int = 480 Field devWidth:Float, devHeight:Float, scaleX:Float, scaleY:Float Global wormLength:Int = 8 Global wormX:Int[wormLength * 17], wormY:Int[wormLength * 17] Field dx, dy:Int Field foodX:Int, foodY:Int Field drawFood:Bool Field gameState:Int Field touchX:Float, touchY:Float Field prevTX:Float, prevTY:Float Field prevHorChange:Float, prevVerChange:Float Method OnCreate() gfxBG = LoadImage("bg.png") devWidth = DeviceWidth() devHeight = DeviceHeight() scaleX = devWidth / BG_WIDTH scaleY = devHeight / BG_HEIGHT ' Init worm For Local w:Int = 0 To 7 * 17 wormX[w] = 200-w wormY[w] = 10*17 Next dx = 1 dy = 0 drawFood = True SetUpdateRate(60) End Method OnUpdate() If TouchHit(0) > 0 Then gameState = PLAY If gameState = STARTSCREEN Then Return If TouchDown() > 0 Then touchX = TouchX() / scaleX touchY = TouchY() / scaleY ' Calculate the differences between current and previous update rounds' touch values If prevTX < touchX Then prevHorChange = Abs(prevTX - touchX) Else prevHorChange = Abs(touchX - prevTX) If prevTY < touchY Then prevVerChange = Abs(prevTY - touchY) Else prevVerChange = Abs(touchY - prevTY) ' Up If touchY - prevTY < 0 And Abs(touchY - prevTY) > prevHorChange Then dx = 0 dy = -1 Endif ' Down If touchY - prevTY > 0 And Abs(prevTY - touchY) > prevHorChange Then dx = 0 dy = 1 Endif ' Left If touchX - prevTX < 0 And Abs(touchX - prevTX) > prevVerChange Then dx = -1 dy = 0 Endif ' Right If touchX - prevTX > 0 And Abs(prevTX - touchX) > prevVerChange Then dx = 1 dy = 0 Endif prevTX = touchX prevTY = touchY Endif If drawFood = True Then foodX = Rnd()*(639-17) foodY = Rnd()*(479-17) drawFood = False Endif If Abs(wormX[0] - foodX) < 17 And Abs(wormY[0] - foodY) < 17 Then wormLength = wormLength + 1 ' Dynamically resize the arrays wormX = wormX.Resize(wormLength * 17) wormY = wormY.Resize(wormLength * 17) wormX[(wormLength-1)*17] = wormX[(wormLength-2)*17] wormY[(wormLength-1)*17] = wormY[(wormLength-2)*17] drawFood = True Endif For Local w:Int = (wormLength - 1) * 17 To 1 Step -1 wormX[w] = wormX[w-1] wormY[w] = wormY[w-1] Next wormX[0] = wormX[0] + dx wormY[0] = wormY[0] + dy End Method OnRender() ' Scale the graphics PushMatrix() Scale (scaleX,scaleY) DrawImage gfxBG,0,0 Select gameState Case STARTSCREEN SetColor 180,120,180 SetBlend AdditiveBlend DrawText "Simple worm game",(640 - TextWidth("Simple worm game")) / 2,10 DrawText "Move your finger on the screen to control the worm",(640 - TextWidth("Move your finger on the screen to control the worm")) / 2,40 DrawText "Touch anywhere to start",(640 - TextWidth("Touch anywhere to start")) / 2,70 Case PLAY SetColor 180,120,180 SetBlend AdditiveBlend DrawText "Worm Length: " + wormLength,0,0 SetColor 0,255,0 SetBlend AlphaBlend SetAlpha 1 SetColor 0,255,0 For Local w:Int = 0 To wormLength - 1 DrawOval wormX[w * 17],wormY[w * 17],17,17 Next SetColor 255,0,0 DrawOval wormX[0],wormY[0],17,17 SetColor 255,255,0 DrawOval foodX,foodY,17,17 End Select PopMatrix() End End Class |
Source code license: Public domain.
Notice, that in this code one part of the worm’s “body” is 17 x 17 pixels, but the worm moves with step of one pixel and can be controlled with accuracy of one pixel. The example code above is simple implementation of this kind of worm game. The down side of the code is, that the sizes of the arrays for x– and y-coordinates depend of the length of the worm in pixels.
I may come back later with some implementation with different concept of moving the worm of which “body” is built with “blocks” of different size than one pixel, but the worm is controlled with accuracy of one pixel, without using arrays of which lengths depend on the size of the worm in pixels.
