another neophyte having animation issues

[Steak]

greetings, LOVE community. i have just started to use this framework about 4 days ago and i must say it's absolutely splendid so far. now, i hate to be asking for things right off the bat without contributing through one way or another but i have been rewriting the drawing code for this particular project a lot and none of the methods i've tried so far seems to work. i do have the current system that i will explain below the following code block, though.

Code: Select all

function love.load()

	screen = {};
		screen.width = 640;
		screen.height = 480;

	love.graphics.setMode(screen.width, screen.height, false, false, 0);
	
	music = {};
		--music.source = love.audio.newSource("14Confrontation.mp3");
	
	--love.audio.play(music.source);
	
	objects = {};
	
		objects.mario = {};
			objects.mario.graphics = love.graphics.newImage("mario.png");
			objects.mario.graphicsWidth = objects.mario.graphics:getWidth(objects.mario.graphics);
			objects.mario.graphicsHeight = objects.mario.graphics:getHeight(objects.mario.graphics);
			objects.mario.quadStartX = 0;
			objects.mario.quadStartY = 0;
			objects.mario.quadWidth = 32;
			objects.mario.quadHeight = 64;
			objects.mario.originX = objects.mario.quadWidth / 2;
			objects.mario.originY = objects.mario.quadHeight / 2;
			objects.mario.quad = love.graphics.newQuad(objects.mario.quadStartX, objects.mario.quadStartY,
														objects.mario.quadWidth, objects.mario.graphicsHeight, 96, 64);

end

function love.update(dt)
	
	--PLACE HOLDER

end

function love.keypressed(key)

	if key == "right" then
		if not (objects.mario.quadStartX > (objects.mario.graphicsWidth - objects.mario.quadWidth * 2)) then
			objects.mario.quadStartX = objects.mario.quadStartX + objects.mario.quadWidth;
		else
			objects.mario.quadStartX = 0;
		end
	end

end

function love.draw()

	love.graphics.drawq(objects.mario.graphics, objects.mario.quad, (screen.width / 2), (screen.height / 2), 
						0, 1, 1, objects.mario.originX, objects.mario.originY, 0, 0);
	
	love.graphics.print(objects.mario.graphicsWidth,0,0);
	love.graphics.print(objects.mario.quadStartX,0,14);

end

mario's image file located in the root of the program:

jlwaD.png (967 Bytes) Viewed 171 times

so i just stored all of mario's graphics information in a table and made the program draw the first frame which is located on the far left of the sheet. in the keypress function, i tried to make it so that the quad's drawing coordinates would switch to his second image by pressing on the right arrow key, however, it doesn't seem to cycle through any of the images at all even though the program is telling me that "objects.mario.quadStartX" is in fact being manipulated. the line "if not (objects.mario.quadStartX > (objects.mario.graphicsWidth - objects.mario.quadWidth * 2)) then" tells the program to switch to the first frame again after the quad's top-right coordinates is larger than a certain point (64,0).

can anyone tell me what i'm doing wrong? i would also prefer to use my own animation system rather than using a library such as AnAL simply because i think it'll help me get more familiar with the language.

thanks everyone.

[bartbes]

Your check looks overly complicated, try this instead:

Code: Select all

function love.keypressed(key)
	if key == "right" then
                            objects.mario.quadStartX = (objects.mario.quadStartX + objects.mario.quadWidth) % objects.mario.graphicsWidth
	end
end

Anyway, the real problem is that you never actually change the Quad. Add this line to that if and you should be fine:

Code: Select all

objects.mario.quad:setViewport(objects.mario.quadStartX, objects.mario.quadStartY, objects.mario.quadWidth, objects.mario.quadHeight, objects.mario.graphicsWidth, objects.mario.graphicsHeight)

I'm not quite sure why you don't use all the variables (and correctly) when initially creating the quad, either.

[Steak]

thanks, it worked perfectly. i didn't actually know there was a function to modify the quad and that the quad's coordinates update automatically without having to call said function. i was also completely unaware of the modulus operator's existence.

again, thanks so much. this helped a lot.