Open canvas 6 brushes how to#
Open canvas 6 brushes update#
Open canvas 6 brushes code#

These games do not compensate for different frame rates and were designed for old hardware with a slow clock speed. When running older games, you can see this kind of effects very clearly. You want to move you objects with a constant speed, no matter the frame rate, so your animation will always look the same on any kind of hardware or device. The motion of your animation will be held back or speed up too and you don't want that to happen. Later, when there is less stress on the system, it might speed up again. Your computer or mobile device might not be able to keep up and delays some frames. But what if the animation was a lot more complex, like when running a game with many different animated objects? Right now, the animation is really simple and runs smooth on about every device. See the example below: Effects of dynamic frame rate on the animation When you run the new code, the rectangle is animated correctly. With this new clear method in place, your game loop looks like this: Starting from the upper left corner at 0,0, continuing for canvas.width and canvas.height. In this case, it is set to clear an area covering the entire canvas. The clearRect() function clears a part of the canvas. This will prevent the blur effect.Īdd clearRect() to the draw() function to always clear the canvas before drawing:Ĭontext.clearRect(0, 0, canvas.width, canvas.height) So, every time you draw, you start with a clean slate. To solve this problem, you'll have to clear the canvas before every new drawing operation. You want to animate the rectangle and not create a blur. You can make use of this effect to create some interesting graphics, but that's not what you need right now.

Creating a blur of drawings, like in the example above. Do this quickly enough and you will get the perception of motion.īut when you forget to clear the canvas, you will draw each drawing on top of the previous. You can draw on it, change position of the rectangle, and draw it again. Well, the canvas acts as a drawing board. The rectangle is drawn on the canvas, but the previous rectangle is never removed. What is happening here? It looks like an endless repetition of rectangles, creating a big blur. When executing the code, you should expect to see the rectangle move in a slanted line, from the upper left corner to the lower right. For now, your game loop looks like this: A blur of repeated graphics

Open canvas 6 brushes update#

Always update the state of your game objects first and, as a final action, draw everything to the screen. Remember this when you start to add other tasks to your game loop. It is important to perform the update() before the draw(), so that you'll always draw the latest state of your game to the canvas. Every frame the update() function is called in the gameLoop() and this will make the rectangle move. When to update the position of your game objects?Ī simple update() function slightly changes the coordinates of the rectangle.

Open canvas 6 brushes code#

With the following code you can update the position of the rectangle: If you change the values of rectX and rectY, you should get a moving rectangle. Change the old draw() function to this new one:Ĭontext.fillRect(rectX, rectY, 150, 100) Īs you can see, the draw operation fillRect() is now using variable arguments as input. Let's make things a bit more interesting. It only draws one rectangle at the same position, over and over again. But the used draw() function is very static.

Open canvas 6 brushes how to#

In the previous tutorial you've learned how to draw repeatedly on the canvas. Now, let's continue and learn how to create your first canvas animation. For more complex animations, or games, you can use the canvas techniques explained in this tutorial. CSS or JavaScript can be used to make simple animations by manipulating HTML elements. Now, with the ending Flash Player support by browsers, HTML5 canvas and CSS animations have taken over. You can read more on the use and history of web animations here.

For more decorative purposes, GIFs were used. SWF files would run inside the browser, using the Flash Player plugin.

They were very commonly used for banner ads. The basics of creating an animation you'll learn here in this tutorial are a key component for creating games, but you can also apply the same principles to create web animations.īack in the days, people used to create web animations using Adobe Flash. By the end of this tutorial, you can create a basic animation with the use JavaScript. Learn how to apply time and easing functions. Create an animation on the HTML5 canvas and make it run smooth, no matter the frame rate.