jBitmap rotation
lazarus / 43-Android

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neuro · 2025-10-30 14:31

File
C:\fpcupdeluxe\ccr\lamw\android_bridges\Laz_And_Controls.pas
contains functions
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i function
jBitmap.ClockWise(_bmp: jObject): jObject;function
jBitmap.AntiClockWise(_bmp: jObject): jObject;
There are no examples showing how to use these functions.
I have tried many variants but none of them work, jBitmap does not
rotate.
Please write sample program code which shows how to use these
functions.

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Ally · 2025-10-30 16:06

https://forum.lazarus.freepascal.org/index.php/topic,70654.msg550977.h
tml#msg550977

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neuro · 2025-10-30 16:41

Quote from: Ally on October 30, 2025, 05:06:40 pmhttps://forum.lazarus
.freepascal.org/index.php/topic,70654.msg550977.html#msg550977

This code is not suitable for Android.
Unfortunately Android uses jBitmap instead of TCustomBitmap.
We need sample program code for jBitmap rotation.

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neuro · 2025-10-31 00:05

I have found out how to use function “AntiClockWise” (which rotates
jBitmap by 90 degrees), the sample program code is the following:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i jBitmapRota
ted.SetImage(jBitmap1.AntiClockWise(jBitmapOriginal.GetImage()));
I have updated LAMW by writing 3 new functions for jBitmap: Rotate,
FlipHorizontal, FlipVertical.
“Rotate” function rotates jBitmap by any angle.

The sample program code us usage is the following:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
jBitmapRotated.SetImage(jBitmap1.Rotate(jBitmapOriginal.GetImage(), Si
ngle(rotation_angle)));jBitmapFlipped.SetImage(jBitmap1.FlipHorizontal
(jBitmapRotated.GetImage()));jBitmapFlipped.SetImage(jBitmap1.FlipVert
ical(jBitmapRotated.GetImage()));
In github I have created pull requests for “lazandroidmodulewizard”
project of jmpessoa.
jmpessoa, please confirm pull requests for github updates.

Newly added jBitmap rotation functions are located in updated LAMW
files:
QuoteC:\fpcupdeluxe\ccr\lamw\android_wizard\smartdesigner\java\jBitmap
.java
C:\fpcupdeluxe\ccr\lamw\android_bridges\Laz_And_Controls.pas
C:\fpcupdeluxe\ccr\lamw\android_bridges\androidwidget.pas

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neuro · 2025-11-11 21:01

I have used jBitmap rotation in free open-source game “Kwazy Quilt
Puzzle No. 7114”.

It is available at Google Play at the address:
https://play.google.com/store/apps/details?id=com.cognaxon.KwazyQuiltP
uzzleNo7114

Source code is available at the address:
https://games.cognaxon.com/?page=kwazy_quilt_puzzle_no_7114