mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
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141 lines
5 KiB
Plaintext
141 lines
5 KiB
Plaintext
{{DISPLAYTITLE:_BLEND}}
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The [[_BLEND]] statement turns on 32 bit alpha blending for an image or screen mode and is on by default.
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{{PageSyntax}}
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: [[_BLEND]] [{{Parameter|imageHandle&}}]
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===Parameters===
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* {{Parameter|imageHandle&}} refers to an image in memory. If not specified, the current destination page (See [[_DEST]]) is affected.
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{{PageDescription}}
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* Alpha blending is on by default when loading a .PNG image to a 32-bit surface.
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* Normally it is used to turn blending on after a previous [[_DONTBLEND]] call.
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* [[_BLEND]] can only be used on 32-bit surfaces, otherwise it will produce the error [[ERROR Codes|Illegal Function Call]].
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* '''Note: [[_DONTBLEND]] is faster than the default [[_BLEND]] unless you really need to use it in 32 bit.'''
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* '''32 bit screen surface backgrounds (black) have zero [[_ALPHA]] so that they are transparent when placed over other surfaces.'''
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{{PageExamples}}
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''Example:''
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{{CodeStart}}
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{{Cl|SCREEN (statement)|SCREEN}} {{Cl|_NEWIMAGE}}(640, 480, 32)
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'{{Cl|CLS}} , {{Cl|_RGB}}(128, 128, 128) 'change background color for other results
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{{Cl|_DONTBLEND}}
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bg& = {{Cl|POINT}}(0, 0)
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{{Cl|PRINT}} {{Cl|_RED}}(bg&), {{Cl|_GREEN}}(bg&), {{Cl|_BLUE}}(bg&), {{Cl|_ALPHA}}(bg&)
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{{Cl|LINE}} (100, 100)-(200, 200), {{Cl|_RGBA32}}(255, 128, 0, 128), BF
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{{Cl|LINE}} (440, 100)-(540, 200), {{Cl|_RGBA32}}(0, 0, 255, 64), BF
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K$ = {{Cl|INPUT$}}(1)
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{{Cl|_BLEND}}
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{{Cl|LINE}} (270, 300)-(370, 400), {{Cl|_RGBA32}}(255, 128, 0, 128), BF
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m& = {{Cl|POINT}}(303, 302)
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{{Cl|PRINT}} {{Cl|_RED}}(m&), {{Cl|_GREEN}}(m&), {{Cl|_BLUE}}(m&), {{Cl|_ALPHA}}(m&)
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K$ = {{Cl|INPUT$}}(1)
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{{Cl|LINE}} (270, 300)-(370, 400), {{Cl|_RGBA32}}(0, 0, 255, 64), BF
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m& = {{Cl|POINT}}(303, 302)
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{{Cl|PRINT}} {{Cl|_RED}}(m&), {{Cl|_GREEN}}(m&), {{Cl|_BLUE}}(m&), {{Cl|_ALPHA}}(m&)
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{{CodeEnd}}
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<table class=MsoTableGrid border=1 cellspacing=0 cellpadding=0
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style='border-collapse:collapse;border:none;mso-border-alt:solid windowtext .5pt;
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mso-yfti-tbllook:480;mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-border-insideh:
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.5pt solid windowtext;mso-border-insidev:.5pt solid windowtext'>
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<tr style='mso-yfti-irow:0;mso-yfti-lastrow:yes'>
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<td width=118 valign=top style='width:88.55pt;border:solid windowtext 1.0pt;
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mso-border-alt:solid windowtext .5pt;background:#FF8000;padding:0cm 5.4pt 0cm 5.4pt'>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'>&nbsp;</span></p>
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</td>
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<td width=181 valign=top style='width:136.05pt;border:solid windowtext 1.0pt;
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border-left:none;mso-border-left-alt:solid windowtext .5pt;mso-border-alt:
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solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'>_RGBA(255,128,0,128)</span></p>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'> onto</span></p>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'> _RGBA(0,0,255,64)</span></p>
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</td>
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<td width=120 valign=top style='width:90.0pt;border:solid windowtext 1.0pt;
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border-left:none;mso-border-left-alt:solid windowtext .5pt;mso-border-alt:
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solid windowtext .5pt;background:blue;padding:0cm 5.4pt 0cm 5.4pt'>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'>&nbsp;</span></p>
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</td>
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<td width=180 valign=top style='width:135.0pt;border:solid windowtext 1.0pt;
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border-left:none;mso-border-left-alt:solid windowtext .5pt;mso-border-alt:
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solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'>results in</span></p>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'> _RGBA(95,48,64,128)</span></p>
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</td>
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<td width=120 valign=top style='width:90.0pt;border:solid windowtext 1.0pt;
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border-left:none;mso-border-left-alt:solid windowtext .5pt;mso-border-alt:
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solid windowtext .5pt;background:#603080;padding:0cm 5.4pt 0cm 5.4pt'>
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<p class=MsoNormal><span lang=EN-AU style='font-size:10.0pt;font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman"'>&nbsp;</span></p>
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</td>
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</tr>
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</table>
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{{PageSeeAlso}}
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* [[_DONTBLEND]], [[_BLEND (function)]]
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* [[Images]]
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{{PageNavigation}} |