Web and Mobile Development articles
Sometimes the clearRect(x, y, width, height) method on the canvas context might not erase the previous graphics drawn. This usually happens when we’re drawing paths using methods like lineTo(), arc(), rect(), etc. and then stroking them with stroke() or filling their content area using fill(). Here’s an example of what I’m trying to convey.
Continue reading “Why clearRect Might Not be Clearing the Canvas Pixels”
Few days ago, I wrote a post about why time based animations are better than frame based animations. However, in animations done as a function of time, some serious problems could arise. One of them is that your regular collision detection techniques might fail if the frame rate is lower than acceptable. Your object might pass through the walls or even fall through the floor!
I am going to share a neat little trick that was learnt while working on an HTML5 game recently. The game is pretty much like our HTML5 Doodle Jump. We had to make sure that the game scales down very well on smaller devices like mobiles, ipads, tablets, etc. and in the process learnt a neat trick to scale the entire canvas across all devices consistently.
Continue reading “Scaling Your HTML5 Canvas to Fit Different ViewPorts (or Resolutions)”
So you got into Web Based Animations or Games (using that HTML5 thingie) and chances are high that you’re relying on setInterval, setTimeout or even better – requestAnimationFrame to reflow and repaint your frames (fancy terms for rendering each animation frame). Precisely, you’re basing your animations or game mechanics on the frame rate. There’s nothing wrong with that, but let me show you a more sophisticated approach which can actually enhance all sorts of user experience – time based animations.
Continue reading “Time Based Animations in HTML5 Games: Why and How to Implement them”
Transforming objects in your HTML5 Game or Experiment requires a bit of understanding regarding how they work. The behaviour and end result is not as intuitive as CSS3 transform functions like rotate() or scale(). I could quickly show you how to rotate or scale an image with its center as the origin, but it’s going to be super useful to take an indepth look at how the entire system works.
Continue reading “Canvas Rotating and Scaling Images Around a Particular Point”
Moving objects on HTML5 Canvas is really easy. I should have written on this topic before writing on gravity but it’s never too late! Let’s get started with the basics.
Continue reading “Rendering Animations with Moving Objects on Canvas”
It is important for our painting application to have different tools like:
We have already built our pencil tool in previous parts. In this part, we’ll focus on creating the aforementioned tools.
Continue reading “Different Tools for Our Sketching Application”