Winform圆形环绕的Loading动画实现代码

之前写了一个wpf的圆形环绕的loading动画，现在写一个winform的圆形环绕的loading动画。

1.新建winform项目，添加一个picturebox控件，命名为：picturebox；

2.引用中添加using system.drawing.drawing2d;

3.form窗体命名为：loading，cs全部代码如下：

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.collections;
using system.drawing.drawing2d;

namespace circle_processbar
{
    public partial class loading : form
    {
        private int count = -1;
        private arraylist images = new arraylist();
        public bitmap[] bitmap = new bitmap[8];
        private int _value = 1;
        private color _circlecolor = color.red;
        private float _circlesize = 0.8f;

        public loading()
        {
            initializecomponent();      
        }

        public color circlecolor
        {
            get { return _circlecolor; }
            set
            {
                _circlecolor = value;
                invalidate();
            }
        }

        public float circlesize
        {
            get { return _circlesize; }
            set
            {
                if (value <= 0.0f)
                    _circlesize = 0.05f;
                else
                    _circlesize = value > 4.0f ? 4.0f : value;
                invalidate();
            }
        }

        public bitmap drawcircle(int j)
        {
            const float angle = 360.0f / 8; bitmap map = new bitmap(150, 150);
            graphics g = graphics.fromimage(map);

            g.translatetransform(width / 2.0f, height / 2.0f);
            g.rotatetransform(angle * _value);
            g.interpolationmode = interpolationmode.highqualitybicubic;
            g.smoothingmode = smoothingmode.antialias;
            int[] a = new int[8] { 25, 50, 75, 100, 125, 150, 175, 200 };
            for (int i = 1; i <= 8; i++)
            {
                int alpha = a[(i + j - 1) % 8];
                color drawcolor = color.fromargb(alpha, _circlecolor);
                using (solidbrush brush = new solidbrush(drawcolor))
                {
                    float sizerate = 3.5f / _circlesize;
                    float size = width / (6 * sizerate);

                    float diff = (width / 10.0f) - size;

                    float x = (width / 80.0f) + diff;
                    float y = (height / 80.0f) + diff;
                    g.fillellipse(brush, x, y, size, size);
                    g.rotatetransform(angle);
                }
            }
            return map;
        }

        public void draw()
        {
            for (int j = 0; j < 8; j++)
            {
                bitmap[7-j] = drawcircle(j);
            }
        }
        protected override void onresize(eventargs e)
        {
            setnewsize();
            base.onresize(e);
        }

        protected override void onsizechanged(eventargs e)
        {
            setnewsize();
            base.onsizechanged(e);
        }

        private void setnewsize()
        {
            int size = math.max(width, height);
            size = new size(size, size);
        }

        public void set()
        {
            for (int i = 0; i < 8; i++)
            {
                draw();

                bitmap map = new bitmap((bitmap[i]), new size(120, 110));

                images.add(map);
            }
            picturebox.image = (image)images[0];
           picturebox.size = picturebox.image.size;

        }
        private void picturebox_click(object sender, eventargs e)
        {
            this.visible = false;
            base.dispose();
        }

        private void timer_tick(object sender, eventargs e)
        {
            set();
            count = (count + 1) % 8;
            picturebox.image = (image)images[count];

        }

        private void button1_click(object sender, eventargs e)
        {
            this.visible = false;
            base.dispose();
        }
    }
}

4.效果如图：