The last four ( dx, dy, dWidth, and dHeight) relate to the destination - the canvas. The next four ( sx, sy, sWidth, and sHeight) relate to the source image - the sprite sheet. Don't worry, it's not as bad as it seems. Whoa, there are a lot of parameters in that method! Especially the third form, which is the one we'll be using. □īefore we get to animating our image, let's look at the drawImage context method, as that's what we'll use for automatically slicing up the sprite sheet and applying it to our canvas. I think we can use all three for a smoother walking animation, though. Technically, the left column is a standing (no animation) while the middle and right columns are animation frames. The first (top) row is the character walking in a downward direction, the second row is walking up, the third row is walking left, and the fourth (bottom) row is walking right. Now that we're set up, let's take a look at the image.Įach row represents and animation cycle. If we were dealing with multiple images, we'd probably want to use Promises to wait for all of them to load before doing anything with them. For the sake of this tutorial, this will work. All of animation code will go in the init function. This is to ensure the image is loaded before we try working with it. The init function is called after the image is loaded, via img.onload. And finally, you can also add extra padding around the sprite sheet.Enter fullscreen mode Exit fullscreen mode If you increase the percentage, more shades and tones will be matched and if you decrease the percentage, then only the given color or just a few tones will be replaced. Also, with the color tone threshold option, you can control how many similar shades of the given color will be replaced. If the given GIF is transparent and has no background, then simply enter "transparent" in the GIF background color. For example, if the background color of a GIF is red and you want to change it to blue, then you need to enter "red" in the GIF background color field and "blue" in the new sprite background field. You can also change the background color of sprites or add a new background if there is none. When playing a GIF, frames are counted above the input box and you can easily delete frames that you don't need by entering their numbers in the skip frames option. The playback order of GIF frames can be either forward (from the first frame to the last) or backward (from the last frame to the first). By default, it's 250 milliseconds for each frame, which equals 4 frames per second. GIF's framerate is determined by how long a single frame is displayed before moving to the next frame. When you open a GIF, you can use the GIF animator options to enable or disable its playback, control the frame rate, and reverse the order of sprites in it. If only the columns number is specified, for example, 3, then the program will distribute all frames into three equal vertical columns. For example, if you enter only the rows value equal to 2 and leave the columns value empty, the program will fit all frames in 2 equal horizontal lines. You can also specify only one of the dimension parameters. For example, by specifying the number of rows equal to 2 and the number of columns equal to 5, you will get a sprite rectangle with a width of five frames and a height of two frames. By default, the frames are drawn in a horizontal animation strip as it's the most popular type but you can change the dimensions and the layout of the sprite sheet to any of the three possible types by adjusting the rows and columns options. The vertical and horizontal sprite sheets are called sprite strips but the rectangular sprite sheet is called a sprite grid. There are three types of sprite sheets – vertical, horizontal, and rectangular. It extracts all frames from the loaded GIF animation and lays them out in an image sequence called a sprite sheet. This is a browser-based GIF to sprite sheet converter.
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