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Graphics JavaScript Web development

Magnify images with a draggable loupe

In a previous post we’ve seen how to create a magnifying glass effect with canvas. But the position of the lens was static, and of course in a useful application a user must be able to move the lens to a point of interest. Let’s make aVue component for that!

Categories
Graphics JavaScript Web development

Creating a magnifying glass with html5 canvas

It is surprisingly easy to manipulate images in the browser using the html5 element canvas. For instance, we can cut out part of the image and paste it back at another positon, in the mean time changing the shape or color of it. And it doesn’t have to be rectangles only!

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Geometry Graphics JavaScript Web development

Fun with canvas transforms

Making use of coordinate system transformations can make drawing on the html5 element canvas much easier. But sometimes it is confusing how transforms work. What is it that is actually transformed? Let’s clear that up and see how to use it.

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Animation Graphics JavaScript Web development

Move eased dot along a curve

In the Bezier curve, perceived as a graph, the horizontal axis shows the time passed, on a scale of zero (at the start) to one (at the end point). The vertical axis shows the progress in distance covered, also from zero (no progress) to one (loop completed), although progress can dive below zero or exceed […]

Categories
Geometry Graphics Mathematics

Bouncing in a box

How to intersect a parabola with a line, and other graphics solutions.