J2me Gradient colors

[omarhassan123]

Hi all,

I want to ask how we can fill j2me primitive shapes (arc, rect, triangle, round rect) with gradient color?

is this possible?

if so how?

Regards,

[ektasrv]

Hi all,

I want to ask how we can fill j2me primitive shapes (arc, rect, triangle, round rect) with gradient color?

is this possible?

if so how?

Regards,

yes, it is possible ref to FN Wiki example - http://wiki.forum.nokia.com/index.ph...ent_in_Java_ME

and also - http://www.j2meforums.com/forum/inde...prev_next=next

[omarhassan123]

yes, it is possible ref to FN Wiki example - http://wiki.forum.nokia.com/index.ph...ent_in_Java_ME

and also - http://www.j2meforums.com/forum/inde...prev_next=next

i tried the example on FN but the color change on it is not smooth like the gradient made by GradientPaint in jse,

and also it only draw lines, how i can draw an arc using those lines?

Thanks,
Omar

[ektasrv]

i tried the example on FN but the color change on it is not smooth like the gradient made by GradientPaint in jse,

and also it only draw lines, how i can draw an arc using those lines?

Thanks,
Omar

Arc is already a problem are of j2me it differs in look on various devices & emulators, so better you go gradient filled objects jpg or svg images.

[omarhassan123]

Arc is already a problem are of j2me it differs in look on various devices & emulators, so better you go gradient filled objects jpg or svg images.

can't we draw these arcs as a successive line which can finally make the arc shape?

[ektasrv]

can't we draw these arcs as a successive line which can finally make the arc shape?

You can try this, successive line in different colors...for some people it worked well on emulator but had shown some empty pixels on some device.

[omarhassan123]

You can try this, successive line in different colors...for some people it worked well on emulator but had shown some empty pixels on some device.

do you know an algorithm for drawing those lines?

[ektasrv]

refer to Fn Wiki - http://wiki.forum.nokia.com/index.ph...vas_in_Java_ME

Useing drawArc, changing color by 1 of RGB value by +1 everytime and changing height,width of Arc below you can try get it.


public void drawArc(int x,
int y,
int width,
int height,
int startAngle,
int arcAngle)
Draws the outline of a circular or elliptical arc covering the specified rectangle, using the current color and stroke style.
The resulting arc begins at startAngle and extends for arcAngle degrees, using the current color. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (x, y) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall. If either width or height is less than zero, nothing is drawn.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.

Parameters:
x - the x coordinate of the upper-left corner of the arc to be drawn
y - the y coordinate of the upper-left corner of the arc to be drawn
width - the width of the arc to be drawn
height - the height of the arc to be drawn
startAngle - the beginning angle
arcAngle - the angular extent of the arc, relative to the start angle
See Also:
fillArc(int, int, int, int, int, int)

[omarhassan123]

refer to Fn Wiki - http://wiki.forum.nokia.com/index.ph...vas_in_Java_ME

Useing drawArc, changing color by 1 of RGB value by +1 everytime and changing height,width of Arc below you can try get it.


public void drawArc(int x,
int y,
int width,
int height,
int startAngle,
int arcAngle)
Draws the outline of a circular or elliptical arc covering the specified rectangle, using the current color and stroke style.
The resulting arc begins at startAngle and extends for arcAngle degrees, using the current color. Angles are interpreted such that 0 degrees is at the 3 o'clock position. A positive value indicates a counter-clockwise rotation while a negative value indicates a clockwise rotation.

The center of the arc is the center of the rectangle whose origin is (x, y) and whose size is specified by the width and height arguments.

The resulting arc covers an area width + 1 pixels wide by height + 1 pixels tall. If either width or height is less than zero, nothing is drawn.

The angles are specified relative to the non-square extents of the bounding rectangle such that 45 degrees always falls on the line from the center of the ellipse to the upper right corner of the bounding rectangle. As a result, if the bounding rectangle is noticeably longer in one axis than the other, the angles to the start and end of the arc segment will be skewed farther along the longer axis of the bounds.

Parameters:
x - the x coordinate of the upper-left corner of the arc to be drawn
y - the y coordinate of the upper-left corner of the arc to be drawn
width - the width of the arc to be drawn
height - the height of the arc to be drawn
startAngle - the beginning angle
arcAngle - the angular extent of the arc, relative to the start angle
See Also:
fillArc(int, int, int, int, int, int)

Thanks a lot Ektasrv for your help

Omar,