![]() ![]() Users who participate in a 24 hour MAP have only 24 hours to complete their part. Users participating in a silhouette MAP draw silhouettes for their part(s) instead of detailing the entire character. Users participating in a sketch MAP only draw the sketch (or animatic) for their parts, instead of lining and/or coloring it. Users participating in a spoof MAP make fun of an audio or song. Users participating in a vent MAP let out their strong emotions in their part(s). They might animate part of the pictures moving slowly or have very tiny bits of animation (such as lights flashing in the background). Users participating in a PMV (or Picture Music Video) MAP don't 'animate', they draw scenes in pictures. Users participating in a scripted MAP are only allowed to animate scenes that the user hosting the MAP "scripted" for them, or told them what to animate. OC MAPs may or may not allow fandom OCs, depending on the rules the host made. Users participating in an OC MAP are only allowed to user their "OCs", or Original Characters. Users participating in a fandom MAP use fandoms in the animation, or characters from a popular movie, book, TV show, or video game, such as Doctor Who, Warriors, Undertale, Gravity Falls, My Little Pony, etc. Lineart MAPs can also consist of a palette, though this is quite uncommon. Users participating in a lineart MAP only draw the lineart for an animation, instead of filling in the sections where the color is usually put. This MAP type most commonly supports a mood, tone or theme and sometimes even a specified emotion. if the user wishes to shade their animation), but are not allowed to use colors outside of the palette. Scratchers are commonly allowed to use slight variations of the color, if the host allows them to do so (e.g. Users participating in a palette MAP may only use certain colors that have been predetermined by the map host. Please improve it according to Scratch Wiki:Guidelines and Scratch Wiki:Editing Conventions. With the information above, we are good to write up our first object model: Petal.This article or section may not have content matching Scratch Wiki editing standards. You can play with this StackBlitz project about petal shape.Īfter the petal shape is defined, we can fill the shape with a color and get a petal, as shown in Figure 1 (4). And the angle between these two vertices against the center point is named petal angle span. The middle two red vertices represent the petal’s radius. The bottom red vertex is the flower’s center point and the top red vertex is the flower petal tip. ![]() There are 4 red points representing petal vertices and 6 blue points representing control points of curves. (6) A flower shape with shadow.įigure 1 (3) shows a basic petal shape consisting of two quadratic curves (green) and two Bézier curve (blue). (5) A flower shape generated by a centered circle and rotated petals. Blue dots are petal curve control points. (1) Quadratic curve (2) Bézier curve (3) Petal shape formed by two quadratic curved (green) and two Bézier curves (blue). In order to smoothly connect two curves (any two curves, either quadratic or Bézier, or other), we need to make sure that the connection point and the two nearby control points are on the same line, so that these two curves have the same curvature at the connection point. In Figure 1 (2), a Bézier curve has a starting point, an end point, and two control points. And we can draw these curves using the quadraticCurveTo() and bezierCurveTo() methods in the HTML canvas API.Īs shown in Figure 1 (1), a quadratic curve has a starting point, an end point, and one control point which determines the curve’s curvature. Inspired by this tutorial, we know that petal shape can be represented by two quadratic curves and two Bézier curves. Let’s first focus on drawing one petal with some abstractions. We are going to define these models by identifying their properties. Notice that the bold nouns ( flower, petal, center) imply models in the code. The petals grow around the center, and they can be drawn by rotating canvas with a certain degree of symmetry. The flower center can be abstracted as a circle filled with some color. ![]() ![]() We can break the parts of a flower down into petals and center (pistil and stamen). Table of Contentsįirst things first, we need to have a function to draw flowers on canvas. Here I will present a detailed process of how to model objects and how to animate them on canvas. In my recent blog post, I described a high level view of composing canvas animations using TypeScript. “A close-up photo of a bee pollinating flowers” by Lukas Blazek on Unsplash You can follow along by playing StackBlitz projects in this blog post, and you are welcome to check out the source code in this GitHub repo. Today we are going to create a canvas animation with pretty blooming flowers, step by step. By Changhui Xu How to Compose Canvas Animations in TypeScript ![]()
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