Each has its advantages, which is why they each exist. Many programming languages have been developed to facilitate instructions to the computer.
#CHEMDOODLE IN CANVAS SOFTWARE#
Programmers have even more advantages, as they can directly communicate with the computer to achieve their desired goals, as opposed to relying on software someone else has created for another purpose. Computers can execute the same operations humans can perform, but far more consistently and at rates far beyond human capability, allowing researchers to investigate numerous hypotheses in short order. In the example above, the loadMolecule() function automatically calls the repaint.Computer literacy is an essential skill for scientists. So you will need to manually call the Canvas.repaint() function if you want a canvas to update. It should be noted that setting the drawChildExtras() function does not repaint the canvas. As can be seen, this is only a static image, but combined with input events and animations, you can create much more advanced interfaces. Using the ChemDoodle Web Components library, you can create any desired graphics for your scientific websites. Let diagonal = radius*Math.sin(Math.PI/4) Ĭtx.moveTo(this.width/2-diagonal, this.height/2-diagonal) Ĭtx.lineTo(this.width/2+diagonal, this.height/2+diagonal) Ĭtx.arc(this.width/2, this.height/2, radius, 0, Math.PI * 2, false) Ĭtx.fillText('DDT is toxic!', this.width/2, this.height-5)
Let viewer = new ChemDoodle.ViewerCanvas('viewer', 200, 200) We will load a structure of the toxic pesticide, DDT, into the component and then draw a warning on top of it. In this example, we will implement the drawChildExtras() function for a ViewerCanvas. You can learn all about drawing graphics at the following documentation pages: If you have experience with drawing graphics in other toolkits, such as Java Swing, then you will feel right at home with HTML5 programming. Drawing underneath the molecule or specifically changing how molecules are drawn (without using the Styles object), is much more complex and will require you to alter the ChemDoodle Web Components library. This function is called after the molecule has been drawn, so any graphics added will cover the molecule. The function is sent a drawing context parameter that you will use to draw on top of the canvas. The drawChildExtras() function can be associated with any 2D canvas (so no WebGL yet). We will, however, cover one last abstract Canvas function, drawChildExtras(), which will allow you to draw on top of a canvas. There are more abstract methods in the ChemDoodle Web Components library, and information on them can be found in the API. On the last page, we covered overriding abstract methods to implement Canvas functionality by handling input events.
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