FMXTBitmapManipulationFunctions (C++)

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Description

This example shows how to use the TBitmap manipulation functions and their results.

The TBitmap manipulation functions are the following: ReplaceOpaqueColor, FlipHorizontal, FlipVertical, InvertAlpha, and Rotate.

To build and test this example, create a Multi-Device Application - C++, and add the following on the form:


Code

First of all, add the following code to the OnClick event handlers of the load button so you can open any bitmap you want.

void __fastcall TForm1::Button1Click(TObject *Sender) {
	if (OpenDialog1->Execute()) {
		Image1->Bitmap->LoadFromFile(OpenDialog1->FileName);
	}
}

Add the following code block to the OnClick event handler of the button for ReplaceOpaqueColor.

void __fastcall TForm1::Button2Click(TObject *Sender) {
	Image2->Bitmap->Assign(Image1->Bitmap);
	Image2->Bitmap->ReplaceOpaqueColor(ColorComboBox1->Color);
}

This is a result example for ReplaceOpaqueColor:

FMXGraphicsTBitmapReplaceOpaqueColor.PNG

Add the following code block to the OnClick event handler of the button for FlipHorizontal.

void __fastcall TForm1::Button3Click(TObject *Sender) {
	Image2->Bitmap->Assign(Image1->Bitmap);
	Image2->Bitmap->FlipHorizontal();
}

This is a result example for FlipHorizontal:

FMXGraphicsTBitmapFlipHorizontal.png

Add the following code block to the OnClick event handler of the button for FlipVertical.

void __fastcall TForm1::Button4Click(TObject *Sender) {
	Image2->Bitmap->Assign(Image1->Bitmap);
	Image2->Bitmap->FlipVertical();
}

This is a result example for FlipVertical:

FMXGraphicsTBitmapFlipVertical.png

Add the following code block to the OnClick event handler of the button for InvertAlpha.

void __fastcall TForm1::Button6Click(TObject *Sender) {
	Image2->Bitmap->Assign(Image1->Bitmap);
	// To see any changes, make sure that the image you are manipulating is already transparent.
	// Otherwise, if the image is solid, the result of InvertAlpha is a completely transparent image.
	Image2->Bitmap->InvertAlpha();
}

This is a result example for InvertAlpha:

FMXGraphicsTBitmapInvertAlpha.png

Add the following code block to the OnClick event handler of the button for Rotate.

void __fastcall TForm1::Button5Click(TObject *Sender) {
	Image2->Bitmap->Assign(Image1->Bitmap);
	Image2->Bitmap->Rotate(NumberBox1->Value);
}

This is a result example for Rotate:

FMXGraphicsTBitmapRotate.png

Uses

See Also

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