I have updated Calculus to version 3.3.1. Now the graphs can be zoomed in.
The zooming isn’t very useful if one doesn’t have “Make y limits equal to x limits” on, what is now by default turned on.
I will try to find time to make the app still better..
The year has started quite slowly for me.. Or has it? I’m again a full time student. That really slices quite a lot of hours of my day. At least I try to find time for my Android app Calculus. Some other projects are also in my mind.
Last summer I started coding a “space game” (I called it Androrace), but I lost my interest in it. Video below:
A try to code an update for Calculus as soon as possible.. Hopefully we’ll see some games too!
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:
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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:
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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:
