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< P class = "Body" style = "margin: 0px" >< span class = "OBOS-Title" > PatternHandler class</ span >< span style = "color: rgb(0,0,0); font-size: 24pt" ></ span ></ P >
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< P class = "Body" style = "margin: 0px" > PatternHandler provides an easy way to integrate pattern support into classes which require it, such as the DisplayDriver class.</ P >
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Member Functions</ P >
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< P class = "Body" style = "margin: 0px" > PatternHandler(void)</ P >
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< P class = "Body" style = "margin: 0px" > ~PatternHandler(void)</ P >
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< P class = "Body" style = "margin: 0px" > void SetTarget(int8 *pattern)</ P >
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< P class = "Body" style = "margin: 0px" > void SetColors(RGBColor c1, RGBColor c2)</ P >
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< P class = "Body" style = "margin: 0px" > RGBColor GetColor(BPoint pt)</ P >
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< P class = "Body" style = "margin: 0px" > RGBColor GetColor(float x, float y)</ P >
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< P class = "Body" style = "margin: 0px" > bool GetValue(float x, float y)</ P >
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< P class = "Body" style = "margin: 0px" > bool GetValue(BPoint pt)</ P >
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Enumerated Types</ P >
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pattern_enum</ P >
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< P class = "Body" style = "margin: 0px" > uint64 type64</ P >
< P class = "Body" style = "margin: 0px" > uint8 type8 [8]</ P >
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< P class = "Body" style = "margin: 0px" >< span class = "OBOS-Function-Def" > PatternHandler()</ span >< span style = "font-size: 16pt" ></ span ></ P >
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1) Initialize internal RGBColor variables to black and white, respectively.</ P >
< P class = "Body" style = "margin: 0px" > 2) Set internal pattern to B_SOLID_HIGH (all 1's)</ P >
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< span class = "OBOS-Function-Def" > ~PatternHandler()</ span >< span style = "font-size: 16pt" ></ span ></ P >
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Empty</ P >
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< span class = "OBOS-Function-Def" > void SetTarget(int8 *pattern)</ span ></ P >
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Updates the pattern handler's pattern. It copies the pattern passed to it, so it does NOT take responsibility for freeing any memory.</ P >
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1) cast the passed pointer in such a way to copy it as a uint64 to the pattern_enum.type64 member</ P >
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< span class = "OBOS-Function-Def" > void SetColors(RGBColor c1, RGBColor c2)</ span ></ P >
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Sets the internal high and low colors for the pattern handler. These will be the colors returned when GetColor() is called.</ P >
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1) Assign c1 to high color and c2 to low color</ P >
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< span class = "OBOS-Function-Def" > RGBColor GetColor(BPoint pt)
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RGBColor GetColor (float x, float y)</ span ></ P >
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< span class = "OBOS-Function-Def" > bool GetValue(BPoint pt)
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bool GetValue (float x, float y)</ span ></ P >
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</ span >< span class = "Default" > GetColor returns the color in the pattern at the specified location. GetValue returns true for the high color and false for the low color.</ span ></ P >
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1) xpos = x % 8, ypos = y % 8
2) value = pointer [ ypos ] & ( 1 << (7 - xpos) )</ span ></ P >
< P class = "Body" style = "margin: 0px" >< span class = "Default" > 3) GetValue: return (value==0)?false:true</ span ></ P >
< P class = "Body" style = "margin: 0px" >< span class = "Default" > GetColor: return (value==0)?lowcolor:highcolor</ span ></ P >
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