Image Movement Help

[^L^]

Code: Select all

	int x=120;
	int y=60;

int main() {
	SceCtrlData pad;
	char buffer[200];
	Image* ourImage;
	pspDebugScreenInit();
	SetupCallbacks();
	initGraphics();

	sprintf(buffer, "ourImage.png");
	ourImage = loadImage(buffer);
	sceDisplayWaitVblankStart();

while(1){
	blitAlphaImageToScreen(0, 0, 32, 32, ourImage, x, y);
	if(pad.Buttons & PSP_CTRL_LEFT) {
		x-=1;
	}
	if(pad.Buttons & PSP_CTRL_RIGHT) {
		x+=1;
	}
	if(pad.Buttons & PSP_CTRL_UP) {
		y-=1;
	}
	if(pad.Buttons & PSP_CTRL_DOWN) {
		y+=1;
	}
}
	


	flipScreen();

	sceKernelSleepThread();
	return 0;
}

Why won't this work?
What can I do to fix it so that my image actually moves around whenever I press the buttons?
I've tried like, 50 different combinations and positions of stuff and I couldn't get it to work.

[Pirata Nervo]

place this after you open your while loop:

Code: Select all

sceCtrlPeekBufferPositive(&pad, 1);

[^L^]

place this after you open your while loop:

Code: Select all

sceCtrlPeekBufferPositive(&pad, 1);

Oh, yeah! I can't believe I forgot that!
I don't think that's all that I need to make this work though.

[hibbyware]

flipScreen(); will never be reached where you have placed it,

Also before your next question comes you need to also clearscreen every loop as without it your image will leave a smudgy trail,

[^L^]

Code: Select all

	int x=120;
	int y=60;

int main() {
	SceCtrlData pad;
	char buffer[200];
	Image* ourImage;
	pspDebugScreenInit();
	SetupCallbacks();
	initGraphics();

	sprintf(buffer, "ourImage.png");
	ourImage = loadImage(buffer);
	sceDisplayWaitVblankStart();

while(1){
	sceCtrlPeekBufferPositive(&pad, 1);
	blitAlphaImageToScreen(0, 0, 32, 32, ourImage, x, y);
	if(pad.Buttons & PSP_CTRL_LEFT) {
		x-=1;
	}
	if(pad.Buttons & PSP_CTRL_RIGHT) {
		x+=1;
	}
	if(pad.Buttons & PSP_CTRL_UP) {
		y-=1;
	}
	if(pad.Buttons & PSP_CTRL_DOWN) {
		y+=1;
	}
	pspDebugScreenClear();
	flipScreen();
}

	sceKernelSleepThread();
	return 0;
}

So, this is what I have now.
It's not working though. how would I fix it?

[Pirata Nervo]

you are clearing the screen with the debug. you can't have debug + GU working at the same time.

[J.F.]

You also need to clear the screen BEFORE you write to it, not before you flip. That simply would erase everything you'd done. :D

[^L^]

So, what would I need to do instead pspDebugScreenClear(); ?

[J.F.]

You seem to be using graphics.c. Look through it - there's lots of stuff in there.

[^L^]

Okay, wow. I love you guys!
Okay, I checked the graphics.c and I saw a function called screenClear(color color); and I tried that and it didn't work. So I was like, oh yeah, I need to have a color in it. So I put 0x00 and it worked!
I'm soooo happy!
I've been trying to get this to work for at least a year and a half! Thanks soo much!
BTW, psp-programming is an awful forum to go onto for questions.

[Pirata Nervo]

a year and a half? o.O

by the way, I recommend you to use unsigned 32 colors.
Remember the PSP little endian so the colors are in a inverted order:
0xAABBGGRR
alpha, blue, green, red

[Dariusc123456]

And be sure to check for warnings in the cygwin or command prompt. it could help lead to a solution.

[^L^]

Yeah, I was just now about to change that to 0xFFFFFFFF
I was just using it as an example.

[^L^]

For the time being, I want the background of the screen to be white.
What's the function for this?
I forgot. Heehee.

[^L^]

Nvm. I got it!



Oh.. um. triple post? Sorry.

[Dariusc123456]

Please read the rules before posting so many times. Its ok to edit the post you made.

[^L^]

Yeah, Sorryz.
And....
Actually, it didn't work.
I used this code I used right after pspDebugScreenInit(); at the beginning of my main loop.

Code: Select all

	pspDebugScreenEnableBackColor(1);
	pspDebugScreenSetBackColor(0x00000000);

[J.F.]

You should be looking at examples more. There's TONS of PSP code floating around, and all of it works. Most emulators come with the source. Most games do as well. I've posted tests, apps, and game conversions here. Do more searching and looking at existing code. You don't seem prepared for this. More homework is needed. :)