项目中要用图形来显示一个闸门的开度,以及控制闸的开度。首先添加一个trackbar,名字是“trackbar1”,一个label,名字是“l_a_shang”,一个groupbox,名字是“gb_right”,,然后添加拉动滚动条时的处理函数
上位机控制 dim m_start as integer dim rcdraw as system.drawing.rectangle
private sub trackbar1_scroll(byval sender as object,byval e as system.eventargs) handles trackbar1.scroll m_start = (100 - trackbar1.value) me.l_a_shang.text = me.trackbar1.value.tostring gb_right.invalidate() 重画gb_right end sub
添加gb_right重画时的处理函数
private sub gb_right_paint(byval sender as object,byval e as system.windows.forms.painteventargs) handles gb_right.paint rcdraw.x = trackbar1.location.x - 40 rcdraw.y = 20 rcdraw.height = 100 rcdraw.width = 20 e.graphics.drawrectangle(new pen(color.blue,5),rcdraw) dim i = trackbar1.location.x - 40 for i = trackbar1.location.x - 40 to trackbar1.location.x - 20 e.graphics.drawline(new pen(color.blue,i,m_start + 20,120) next
me.l_a_shang.text = me.trackbar1.value.tostring + "%" end sub
到此以及可以实现拉动条的时候,图像跟着变化,并显示百分比。 (编辑:李大同)
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