how do I get my sprite to move up and down once

phil67rpg · 2019-10-11T04:10:53

I have worked on this problem for several days. I have almost solved my problem. I have got my sprite to move up and down continuously using the mouse. this done by using the glutTimerFunc function. I want the mouse to get the sprite to move up and down once. I have googled and debugged my code. I have also taken some JavaScript code and ported it over into opengl. let me know if you need my question to be more specific. here is my code so far. bool onGround = false; void StartJump() { if (onGround) { velocityY = -12.0f; onGround = false; } } void EndJump() { if (velocityY < -6.0f) { velocityY = -6.0f; } } void Update() { velocityY += gravity; positionY += velocityY; positionX += velocityX; if (positionY > 25.0f) { positionY = 0.0f; velocityY = 0.0f; onGround = false; } } void Loop(int val) { Update(); drawSprite(); glutPostRedisplay(); glutTimerFunc(33, Loop, 0); } void mouseClicks(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) { StartJump(); } if (button == GLUT_LEFT_BUTTON && state == GLUT_UP) { EndJump(); } } void handleKeypress(unsigned char key, int x, int y) { switch (key) { case 27: exit(0); break; case 32: Loop(0); break;

For Beginners C++ 2D OpenGL

Started by phil67rpg October 02, 2019 04:52 PM

75 comments, last by Tom Sloper 5 years, 1 month ago

JoeJ

4,350

October 10, 2019 07:30 PM

1 hour ago, phil67rpg said:

I am getting no help on my code just a lot of negative feedback

Here is Prototypes solution (page 2):

Here is mine (page 3 - not using GLUT but easy for you to do so):

Both should work, but it was you who gave no feedback on this. Did you try? Did it work?

(I had to zoom out a lot to see the jump working - you may need to tweak velocity and gravity until it behaves like you want.)

phil67rpg

Author

458

October 11, 2019 12:56 AM

well besides jumping is there anything else I can add to my game?

JoeJ

4,350

October 11, 2019 01:19 AM

8 hours ago, AtomicWinter said:

Phil should get the 2019 troll award.

This.

Still no feedback - ist your jump working now or not?

And... well, you have a hard time learning programming, but you don't give up. Because you really want to create the game of your dreams. Fine.

And now you ask others what to add to this game?

phil67rpg

Author

458

October 11, 2019 01:22 AM

sorry for being so tenacious but I really want to a simple little indie rpg game.

NubDevice

2,539

October 11, 2019 01:46 AM

That's the way this goes...

I think you should have a circle(sprite?) that bounces off the left and right edges of the screen and what you define as ground. After that, wire together a relationship between your sprite character and the circle thing.

You know, throw a little Pong at it... it could be a side quest. PongRPG..could be a thing.

Throwing stuff at my 'Hobby Game"