Hi All,
Below is the example of drawing a box and circle. Can anyone please help me
find out why the circle drawing does not match with the co-ordinate system ?
1) I draw a box with width 30
2) I draw some circles and the last circle was at 30th pixel but its drawn on
60th pixel
Can anyone help me understand any wrong i did ?
<?xml version="1.0" encoding="UTF-8" ?>
<canvas width="800" height="800" debug="true" >
<class name="circle" extends="drawview" >
<attribute name="circlecolor" value="white"/>
<attribute name="r" value="100"/>
<handler name="oninit">
this.redraw();
</handler>
<handler name="onr">
this.redraw();
</handler>
<method name="redraw" ><![CDATA[
this.clear();
this.beginPath();
this.moveTo(x+r, y);
var a = Math.tan(22.5 * Math.PI/180);
for (var angle = 45; angle<=360; angle += 45) {
// endpoint:
var endx = r*Math.cos(angle*Math.PI/180);
var endy = r*Math.sin(angle*Math.PI/180);
// control:
// (angle-90 is used to give the correct sign)
var cx =endx + r*a*Math.cos((angle-90)*Math.PI/180);
var cy =endy + r*a*Math.sin((angle-90)*Math.PI/180);
this.quadraticCurveTo(cx+x, cy+y, endx+x, endy+y);
}
var g = this.createLinearGradient(0, 0, 8, x+r, y+r, 0)
this.globalAlpha = 1;
g.addColorStop(0, 0xffffff);
this.globalAlpha = 0;
g.addColorStop(1, this.circlecolor);
this.fillStyle = g;
this.fill()
this.globalAlpha = 1;
this.linewidth= 5;
this.stroke();
]]>
</method>
</class>
<class name="box" extends="drawview">
<animator name="myAnimator" attribute="opacity" to="1" duration="1000"
start="true"/>
<handler name="oninit">
</handler>
<method name="setNewHeight" ><![CDATA[
]]>
</method>
</class>
<box x="0" y="0" width="30" height="10" bgcolor="blue" opacity=".5"
name="b1"/>
<circle r="1" x="0" y="0" circlecolor="blue"/>
<circle r="1" x="10" y="0" circlecolor="blue"/>
<circle r="1" x="20" y="0" circlecolor="blue"/>
<circle r="1" x="30" y="0" circlecolor="blue"/>
</canvas>
-----------------
thanks & regards,
muthu veerappan
