Small Talks/2013/May/ZK Graphics Component

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Author
Jumper Chen, Engineer, Potix Corporation

Date
May 07, 2013

Version
ZK 6.5.2 and later

Overview

The ZK Graphics component is based on HTML5 canvas to draw a set of shapes for developer to use and the usage of the ZK Graphics is just like SVG syntax for developer to lay out their own graphics products. The main feature of this component is that we utilize CSS3 transition and transform effects for user to customize the animation more easy without any Javascript code, only Java programing. In this smalltalk, I will guide you how to use ZK Graphics Component to draw your own charting component (Bar chart)

Main Features

Here lists the few key features for you to glance through them.

Shapes Component

The built-in component set are:

Circle

<stage id="stage" hflex="1" vflex="1">
	<layer>
		<circle cx="50" cy="50" r="40" stroke="black"
			strokeWidth="2" fill="red" />
	</layer>
</stage>

Ellipse

<stage id="stage" hflex="1" vflex="1">
	<layer>
		<ellipse x="240" y="100" radiusX="220" radiusY="30" fill="purple"/>
	</layer>
</stage>

Path

<stage id="stage" hflex="1" vflex="1">
	<layer x="300">
		<path id="lineAB" data="M 100 350 l 150 -300" stroke="red"
			strokeWidth="3" fill="none" />
		<path id="lineBC" data="M 250 50 l 150 300" stroke="red"
			strokeWidth="3" fill="none" />
		<path data="M 175 200 l 150 0" stroke="green" strokeWidth="3"
			fill="none" />
		<path data="M 100 350 q 150 -300 300 0" stroke="blue"
			strokeWidth="5" fill="none" />
	</layer>
</stage>

Polygon

<stage id="stage" hflex="1" vflex="1">
	<layer>
		<polygon id="polygon" fill="#00d2ff" stroke="black" strokeWidth="5"
			 points="73,192 73,160 340,23 500,109 499,139 342,93" draggable="true"/>
	</layer>
</stage>

Polyline

<stage id="stage" hflex="1" vflex="1">
	<layer>
		<polyline points="0,40 40,40 40,80 80,80 80,120 120,120 120,160"
				style="fill:white;stroke:red;stroke-width:4" />
	</layer>
</stage>

Rect

<stage id="stage" hflex="1" vflex="1">
	<layer>
		<group draggable="true" x="100" y="50">
			<text y="-20"  textContent="Normal Rectangle" fill="#555"/>
			<rect width="100" height="50" fill="green" stroke="black" strokeWidth="4"/>
		</group>
		<group draggable="true" x="300" y="50">
		<text y="-20" textContent="Radial-Gradient Rectangle" fill="#555"/>
		<rect width="100" height="50" stroke="black" strokeWidth="4"
			fillStyle="radial-gradient" fillStartPoint="0" fillEndPoint="0"
			fillStartRadius="0" fillEndRadius="70" fillColorStops="0, red, 1, yellow"
			/>
		</group>
		<group draggable="true" x="500" y="50">
		<text y="-20" textContent="Linear-Gradient Rectangle" fill="#555"/>
		<rect width="100" height="50" stroke="black" strokeWidth="4"
			fillStyle="linear-gradient" fillStartPoint="-50,-50" fillEndPoint="50,50"
			fillColorStops="0, red, 1, yellow"
			/>
		</group>
	</layer>
</stage>

Text

<stage id="stage" hflex="1" vflex="1">
	<layer x="10" y="10">
		<text fontSize="25" textAnchor="middle" textContent="Radial-Gradient Rectangle"
			 fill="#555" shadowColor="red" shadowBlur="3"/>
	</layer>
</stage>

Bar Chart Demo

Suppose you define a component for eg. window as shown below in your zul Image

<window title="ZK Rocks" border="normal">
</window>

Downloads

You can get complete source for the example described in this smalltalk from its github

Comments

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