[android-developers] Please help in explaining this geometrical concept!!
I know this a stupid question to ask, but I was going through a tutorial
and I just dont seem to understand the below lines of code...Have pulled my
hair understanding the geometrical algorithm behind this, but.Oh!!!
This is very simple but I just dont seem to get it. Please helpI am a
beginner...
private void drawPict(Canvas canvas, int x, int y, int w, int h,
float sx, float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}
@SuppressWarnings(unused)
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(),
getHeight()));
mPicture.endRecording();
int x = getWidth()/2;
int y = getHeight()/2;
if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}
I have looked into this again...and understand that canvas.scale has 4
parameters, being the co-ordinates of the points I assume...but I cannot
still understand the float sx, float sy...
sx=-1 and sy=1...it will scale, agreed...but is not there a better way?
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[android-developers] Explain the goemetrial concept behind this, please!!
I know this a stupid question to ask, but I was going through a tutorial
and I just dont seem to understand the below lines of code...Have pulled my
hair understanding the geometrical algorithm behind this, but.Oh!!!
This is very simple but I just dont seem to get it. Please helpI am a
beginner...
private void drawPict(Canvas canvas, int x, int y, int w, int h,
float sx, float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}
@SuppressWarnings(unused)
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(),
getHeight()));
mPicture.endRecording();
int x = getWidth()/2;
int y = getHeight()/2;
if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}
I have looked into this again...and understand that canvas.scale has 4
parameters, being the co-ordinates of the points I assume...but I cannot
still understand the float sx, float sy...
sx=-1 and sy=1...it will scale, agreed...but is not there a better way?
--
You received this message because you are subscribed to the Google
Groups Android Developers group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Posts not showing up?
Same thing with me... On Thursday, September 13, 2012 2:56:47 PM UTC+5:30, Martijn van Mechelen wrote: Hi, Two days ago I've posted three messages into the Android Developers group. The messages probably have to moderated, but they are still not showing up. Is something going wrong? Regards, Martijn van Mechelen -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Explain the goemetrial concept behind this, please!!
On Thursday, September 13, 2012 3:31:07 PM UTC+5:30, Fred Niggle wrote: Your post if very vague, at a guess i think your trying to ask someone to explain the concepts of matrix's and image manipulation, and that is true that this mailing list is not the place for such a question. Regards, Fred On 13 September 2012 10:54, Andrea Pietroni andrea@gmail.comjavascript: wrote: Negative scale numbers mirror the image. It looks like it's drawing the picture half scaled 4 times: - first time at top left - then at its right, mirroring accordingly - etc -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.comjavascript: To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Ubuntu Speech inputhttps://play.google.com/store/apps/details?id=com.nds.ubuntuspeechinputis now available on Google Play, along with Magnetic Door Alarm apphttps://play.google.com/store/apps/details?id=com.nds.magneticdooralarm . -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Explain the goemetrial concept behind this, please!!
Thank you On Thursday, September 13, 2012 3:24:49 PM UTC+5:30, Andrea Pietroni wrote: Negative scale numbers mirror the image. It looks like it's drawing the picture half scaled 4 times: - first time at top left - then at its right, mirroring accordingly - etc -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Explain the goemetrial concept behind this, please!!
Fred, I understand...But had to learn it somehow though..And SORRY On 13 September 2012 10:54, Andrea Pietroni andrea.pietr...@gmail.comwrote: Negative scale numbers mirror the image. It looks like it's drawing the picture half scaled 4 times: - first time at top left - then at its right, mirroring accordingly - etc -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Ubuntu Speech inputhttps://play.google.com/store/apps/details?id=com.nds.ubuntuspeechinputis now available on Google Play, along with Magnetic Door Alarm apphttps://play.google.com/store/apps/details?id=com.nds.magneticdooralarm . -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Any API's exposed for the English Premier League
Hello, Am developing a widget that would refresh with a data of the current match that is going on and the score...Similar to a free app IPL Live Score Widget by Himashu Shringarpure...I ve the look and feel of the app, ready but am not getting any API's that I can hook into... Do I go by the method http://buildmobile.com/performing-network-updates/#fbid=eCwMXYB__NH and if yes I would need the API s or better still please give me the steps to be followed to complete the task. Will it require a parsing mechanism or what??? -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
