|
C#用户控件之仪表盘
如何让温度、湿度、压力等有量程的监控值如仪表盘(DashBoard)一样显示?
思路(GDI绘图):
定义属性:(仪表盘的半径、颜色、间隙;刻度圆的半径、颜色、字体;指针的颜色、占比;文本的字体、占比;)
绘制图形:(半圆、刻度、指针、中心、文本)
定义属性(将以上属性挨个敲完)- //量程属性(Font、Color、Float、Int、String、Bool)
- private float range = 180.0f;
- [Browsable(true)]
- [Category("布局_G")]
- [Description("量程")]
- public float Range
- {
- get { return range; }
- set
- {
- if (value < 0.0f) return;
- range = value; this.Invalidate();
- }
- }
复制代码 定义字段- private Graphics g; //画布
- private Pen p; //笔-绘制线条、曲线
- private SolidBrush sb; //笔(填充)-填充矩形、路径
- private int width;
- private int height;
复制代码 仪表盘外环- //画外环的三个圆弧(DrawArc)
- float angle = (180.0f - gapAngle * 2) / 3; //定义角度
- RectangleF rec = new RectangleF(10, 10, this.width - 20, this.width - 20); //定义坐标、宽、高
- p = new Pen(colorCircle1, outThickness);
- g.DrawArc(p, rec, -180.0f, angle); //第一个弧
- p = new Pen(colorCircle2, outThickness);
- g.DrawArc(p, rec, -180.0f + angle + gapAngle, angle); //第二个弧
- p = new Pen(colorCircle3, outThickness);
- g.DrawArc(p, rec, -180.0f + angle * 2.0f + gapAngle + 2.0f, angle); //第三个弧
复制代码 仪表盘刻度- g.TranslateTransform(this.width * 0.5f, this.width * 0.5f);
复制代码 点击查看代码- for (int i = 0; i < 4; i++)
- {
- float actualAngle = -180.0f + 60.0f * i;
- double x1 = Math.Cos(actualAngle * Math.PI / 180);
- double y1 = Math.Sin(actualAngle * Math.PI / 180);
- float x = Convert.ToSingle(this.width * scaleProportion * 0.5f * x1);
- float y = Convert.ToSingle(this.width * scaleProportion * 0.5f * y1);
- StringFormat sf = new StringFormat();
- if (i > 1)
- {
- x = x - 60;
- sf.Alignment = StringAlignment.Far;
- }
- else
- {
- sf.Alignment = StringAlignment.Near;
- }
- //刻度的坐标,宽,高
- rec = new RectangleF(x, y, 60, 20);
- sb = new SolidBrush(scaleColor);
- if (range % 6 == 0)
- {
- g.DrawString((range / 3 * i).ToString(), scaleFont, sb, rec, sf);
- }
- else
- {
- g.DrawString((range / 3 * i).ToString("f1"), scaleFont, sb, rec, sf);
- }
- }
复制代码 仪表盘中心点- //画中心(FillEllipse)
- g.FillEllipse(new SolidBrush(pointColor), new RectangleF(-centerRadius, -centerRadius, centerRadius * 2.0f, centerRadius * 2.0f));
复制代码 仪表盘指针- //画指针(DrawLine)
- p = new Pen(pointColor, 3.0f); //定义指针颜色、宽度
- float sweepAngle = currentValue / range * 180.0f; //划过的角度
- float z = this.width * 0.5f * scaleProportion - outThickness * 0.5f - 20.0f; //指针长度
- g.RotateTransform(90.0f); //默认开始角度
- g.RotateTransform(sweepAngle);
- g.DrawLine(p, new PointF(0, 0), new PointF(0, z)); //画一条线
复制代码 下标文本标签- //写文本(DrawString)
- g.RotateTransform(-sweepAngle);
- g.RotateTransform(-90.0f); //指定初始角度
- StringFormat sf = new StringFormat();
- sf.Alignment = StringAlignment.Center;
- rec = new RectangleF(this.width * (-0.5f), this.height * textProportion - 0.5f * this.width, this.width, this.height * (1.0f - this.scaleProportion));
- string val = TextPrefix + currentValue.ToString() + "" + textUnit ; //指定字符串
- g.DrawString(val, textFont, new SolidBrush(textColor), rec, sf);
复制代码 最后生成(自定义各种监控值显示)
End
来源:https://www.cnblogs.com/guoenshuo/p/18395549
免责声明:由于采集信息均来自互联网,如果侵犯了您的权益,请联系我们【E-Mail:cb@itdo.tech】 我们会及时删除侵权内容,谢谢合作! |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有账号?立即注册
x
|