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Task/Mandelbrot-set/Ring/mandelbrot-set.ring

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+load "guilib.ring"
+
+new qapp
+        {
+        win1 = new qwidget() {
+               setwindowtitle("drawing using qpainter")
+               setgeometry(100,100,500,500)
+               label1 = new qlabel(win1) {
+                        setgeometry(10,10,400,400)
+                        settext("")
+               }
+               new qpushbutton(win1) {
+                   setgeometry(200,400,100,30)
+                   settext("draw")
+                   setclickevent("draw()")
+               }
+               show()
+         }
+         exec()
+         }
+
+func draw
+        p1 = new qpicture()
+             color = new qcolor() {
+             setrgb(0,0,255,255)
+        }
+        pen = new qpen() {
+              setcolor(color)
+              setwidth(1)
+        }
+        new qpainter() {
+            begin(p1)
+            setpen(pen)
+
+        x1=300 y1=250
+        i1=-1 i2=1 r1=-2 r2=1
+        s1=(r2-r1)/x1 s2=(i2-i1)/y1
+        for y=0 to y1
+            i3=i1+s2*y
+            for x=0 to x1
+                r3=r1+s1*x z1=r3 z2=i3
+                for n=0 to 30
+                    a=z1*z1 b=z2*z2
+                    if a+b>4 exit ok
+                       z2=2*z1*z2+i3 z1=a-b+r3
+                next
+                if n != 31 drawpoint(x,y) ok
+            next
+        next
+
+        endpaint()
+        }
+        label1 { setpicture(p1) show() }