BBjDrawPanel::clearDrawing

Description

In BBj 16.0 and higher, this method erases all drawn objects from the BBjDrawPanel and covers the window (except any visible controls or child windows) with the current background color or the specified background color.

Syntax

Return Value	Method
void	clearDrawing()
void	clearDrawing(BBjColor color)

Parameters

Variable	Description
color	If specified, this is the new background color.

Return Value

None.

Remarks

None.

Example

rem ' BBjDrawPanel::clearDrawing

sysgui = unt
open (sysgui)"X0"
sysgui! = bbjapi().getSysGui()
title$ = "BBjDrawPanel::clearDrawing"
window! = sysgui!.addWindow(25,25,1200,750,title$,$00090003$)
window!.setCallback(window!.ON_CLOSE,"eoj")
window!.setTrack(0)
window!.setFont(sysgui!.makeFont("Arial",8,0))
drawpanel! = window!.getDrawPanel()
drawpanel!.setPenColor(BBjColor.BLUE)
drawpanel!.setFillColor(BBjColor.GREEN)
drawpanel!.setTextColor(BBjColor.BLUE)
drawpanel!.setRound(5,5)
drawpanel!.drawText(10,25,"Shape")
drawpanel!.drawText(10,55,"drawPoint")
drawpanel!.drawText(10,100,"drawRect")
drawpanel!.drawText(10,175,"drawArc")
drawpanel!.drawText(10,225,"drawArc")
drawpanel!.drawText(10,325,"drawEllipse")
drawpanel!.drawText(10,400,"drawArrow")
drawpanel!.drawText(10,450,"drawArrow")
drawpanel!.drawText(10,500,"drawLine")
drawpanel!.drawText(10,575,"drawPolygon")
drawpanel!.drawText(10,675,"drawPolyline")
for i = 0 to 10
    x = i * 100 + 25
    drawpanel!.setFillType(i)
    drawpanel!.setPattern(i)
    drawpanel!.setPenWidth((i+1)*0.25)
    drawpanel!.drawPoint(x+100,50)
    drawpanel!.drawText(x+85,25,"setFillType("+str(i)+")")
    drawpanel!.drawRect(x+75,75,75,50)
    r1 = i * Math.PI / 2
    r2 = r1 + Math.PI / 2
    drawpanel!.drawArc(x+100,175,25,1,r1,r2,1)
    drawpanel!.drawArc(x+100,225,25,1,r1,r2,0)
    drawpanel!.drawEllipse(x+75,275,75,50)
    adj = (i-5) * 5
    drawpanel!.moveTo(x+75,400)
    drawpanel!.drawArrow(x+150,400+adj,0,1)
    drawpanel!.moveTo(x+75,450)
    drawpanel!.drawArrow(x+150,450+adj,1,0)
    drawpanel!.drawLine(x+75,500,x+150,525)
    points = i + 3
    list! = bbjapi().makeVector()
    for point = 0 to points-1
        angle = point * 2 * Math.PI / points
        px = int(40 * cos(angle) + 110 + x)
        py = int(40 * sin(angle) + 600)
        list!.add(px)
        list!.add(py)
    next point
    drawpanel!.drawPolygon(list!)
    list! = bbjapi().makeVector()
    for point = 0 to points-1
        angle = point * 2 * Math.PI / points
        px = int(40 * cos(angle) + 110 + x)
        py = int(40 * sin(angle) + 700)
        list!.add(px)
        list!.add(py)
    next point
    drawpanel!.drawPolyline(list!)
next i
if (msgbox("BBjDrawPanel::clearDrawing?",4,"clearDrawing") = 6) then
    drawpanel!.clearDrawing()
endif
process_events

eoj:
release

See Also

CLEARBG Mnemonic - Clear To Background Color (SYSGUI)

CLEAR Mnemonic - Clear Drawn SYSGUI Objects

See the BBj Object Diagram for an illustration of the relationship between BBj Objects.