VI10AddArcBetweenAngles
V = Vector
I = Image
Function that is used to manage the Vector Image feature (object that resides on some Qpaint versions).
The VI10AddArcBetweenAngles function adds, queued instructions to be processed into the Buffer to perform the drawing, a set of instructions to draw an arc whose route goes from point A to point B in a circle whose X-Y coordinates are passed of the center of the radius.
Point A and point B are not expressed with X-Y coordinates but with circumferential corners.
The X and Y coordinates of the B point (calculated within the function) it also set, at end of statement, as current coordinates.
| Buffer |
 |
IMPLEMENTATION
VI10AddArcBetweenAngles (awBuffer, Centre_Xo, Centre_Yo, Angle_A, Angle_B, Radius)
Parameters:
| IN/OUT | VARIABLE TYPE | EXAMPLE NAME | DIM | |
|---|---|---|---|---|
| IN | ARRSYS / ARRGBL | awBuffer | W | Array that serves as a buffer for instructions/data |
| IN | CONST/ GLOBAL | Centre_Xo | W | Variable containing the Xo circumferential Center coordinate value on which the arc is drawn. |
| IN | CONST/ GLOBAL | Centre_Yo | W | Variable containing the Yo circumferential Center coordinate value on which the arc is drawn. |
| IN | CONST/ GLOBAL | Angle_A | W | Variable containing the A angle value of the start arc. (Expressed in tenths of a degree) |
| IN | CONST/ GLOBAL | Angle_B | W | Variable containing the B angle value of the end arc. (Expressed in tenths of a degree) |
| IN | CONST/ GLOBAL | Radius | W | Variable containing the value of the radius of the circle on which you want to draw the arc. |
Example
TASK_00
MAIN: VI10InitBuffer (awBuffer) ;Initializes the Buffer Color = 0 ;Sets black color VI10AddPen (awBuffer, Color) ;Adds the PEN command Coord_X = 0 ;Sets the coordinates for the MOVE Coord_Y = 70 VI10AddMove (awBuffer, Coord_X, Coord_Y) ;Adds the MOVE command Centre_Xo = 0 ;Sets the coordinates of the center circumference Centre_Yo = 50 Angle_A = 200 ;Sets the angle of the A point (20°) Angle_B = 900 ;Sets the angle of the B point (90°) Radius = 20 ;Sets the Radius of the circumference VI10AddArcBetweenAngles (awBuffer, Centre_Xo, Centre_Yo, Angle_A, Angle_B, Radius) ;Adds Construction arch with corners .... WAIT 1 JUMP MAIN END
Note
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Considered the pictures below:
the function trace an arc from point A to point B (expressed as angles) of the unit identified by the X-Y coordinates of the center and the radius is passed to the function.