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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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is supported by Windows Forms on the Graphics object: all the coordinates specified in the drawing primitives are affected by a transformation matrix stored in the device context. Once set, a transformation of the library takes care of the calculations necessary to rotate, translate, and scale all the objects. After clearing the background using the Background color property, you draw the various lines such as the axes and the labels depending on the configuration settings specified by setting the control s properties. This is the typical structure of a paint method, where the model is tested to decide what should be drawn and the style to be used. The drawing of the data samples is controlled by the timePerUnit and pixelsPerUnit variables, and then the inner recursive function drawSamples selects the visible samples and uses the DataSamples object to compute results. You rely on the ability of the DataSamples class to interpolate data and not have to deal with discrete samples. The core business of the paint method is often simple (having paid attention when you defined the model and the controller of the control); it quickly becomes entangled in testing all the configuration properties to determine how the control should be rendered. Listing 11-4. Drawing the Control override x.OnPaint (e:PaintEventArgs) = let g = e.Graphics // A helper function to size up strings let measurestring s = g.MeasureString(s, x.Font) // Work out the size of the box to show the values let valBox = let minbox = measurestring (String.Format(verticalLabelFormat, lastMin)) let maxbox = measurestring (String.Format(verticalLabelFormat, lastMax)) let vbw = max minbox.Width maxbox.Width let vbh = max minbox.Height maxbox.Height SizeF(vbw, vbh) // Work out the size of the box to show the times let timeBox = let lasttime = x.GetTime(initView + int64(visibleSamples)) let timelbl = String.Format(timeFormat, lasttime) measurestring timelbl // Work out let plotBox let ltm let rbm the plot area for the graph = = leftTopMargin = rightBottomMargin
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let ltm,rbm = let ltm = Size(width=max ltm.Width (int(valBox.Width)+5), height=max ltm.Height (int(valBox.Height/2.0f) + 2)) let rbm = Size(width=rightBottomMargin.Width, height=max rbm.Height (int(timeBox.Height) + 5)) ltm,rbm // Since we invert y axis use Top instead of Bottom and vice versa Rectangle(ltm.Width, rbm.Height, x.Width - ltm.Width - rbm.Width, x.Height - ltm.Height - rbm.Height)
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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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// The time interval per visible sample let timePerUnit = let samplew = float32(visibleSamples) / float32(plotBox.Width) max 1.0f samplew // The pixel interval per visible sample let pixelsPerUnit = let pixelspan = float32(plotBox.Width) / float32(visibleSamples) max 1.0f pixelspan // Compute the range we need to plot let (lo, hi) = data.FindMinMax(int64(timePerUnit), initView, initView + int64(visibleSamples), minVisibleValue, maxVisibleValue) // Save the range to help with computing sizes next time around lastMin <- lo; lastMax <- hi // We use these graphical resources during plotting use linePen = new Pen(x.ForeColor) use axisPen = new Pen(axisColor) use beginPen = new Pen(beginColor) use gridPen = new Pen(Color.FromArgb(127, axisColor), DashStyle=DashStyle.Dash) use fontColor = new SolidBrush(axisColor) // Draw the title if (x.Text <> null && x.Text <> string.Empty) then let sz = measurestring x.Text let mw = (float32(plotBox.Width) - sz.Width) / 2.0f let tm = float32(plotBox.Bottom - plotBox.Height) let p = PointF(float32(plotBox.Left) + mw, tm) g.DrawString(x.Text, x.Font, new SolidBrush(x.ForeColor), p) // Draw the labels let nly = int((float32(plotBox.Height) /valBox.Height) / 3.0f) let nlx = int((float32(plotBox.Width) / timeBox.Width) / 3.0f) let pxly = plotBox.Height / max nly 1 let pxlx = plotBox.Width / max nlx 1 let dvy = (hi - lo) / float32(nly) let dvx = float32(visibleSamples) / float32(nlx) let drawString (s:string) (xp:float32) (yp:float32) = g.DrawString(s,x.Font,fontColor,xp,yp) // Draw the value (y) labels for i = 0 to nly do let liney = i * pxly + int(valBox.Height / 2.0f) + 2 let lblfmt = verticalLabelFormat let posy = float32(x.Height - plotBox.Top - i * pxly)
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