private void BuildLegend(
PrimitiveComposer composer,
string[] steps,
colorSpaces::Color[] colors,
SizeF pageSize
)
{
float maxCtmInversionApproximation;
{
float[] ctmInversionApproximations = new float[6];
{
float[] initialCtmValues, finalCtmValues;
{
ContentScanner.GraphicsState state = composer.Scanner.State;
initialCtmValues = state.GetInitialCtm().Elements;
finalCtmValues = state.Ctm.Elements;
}
for(
int index = 0,
length = finalCtmValues.Length;
index < length;
index++
)
{ctmInversionApproximations[index] = Math.Abs(finalCtmValues[index]) - initialCtmValues[index];}
}
maxCtmInversionApproximation = Max(ctmInversionApproximations);
}
BlockComposer blockComposer = new BlockComposer(composer);
blockComposer.LineSpace = new Length(.25, Length.UnitModeEnum.Relative);
composer.BeginLocalState();
composer.SetFillColor(
new colorSpaces::DeviceRGBColor(115 / 255d, 164 / 255d, 232 / 255d)
);
RectangleF frame = new RectangleF(
18,
18,
pageSize.Width * .5f,
pageSize.Height * .5f
);
blockComposer.Begin(frame,XAlignmentEnum.Left,YAlignmentEnum.Top);
composer.SetFont(ResourceName_DefaultFont,24);
blockComposer.ShowText("Page coordinates sample");
SizeF breakSize = new SizeF(0,8);
blockComposer.ShowBreak(breakSize);
composer.SetFont(ResourceName_DefaultFont,8);
blockComposer.ShowText(
"This sample shows the effects of the manipulation of the CTM (Current Transformation Matrix), "
+ "that is the mathematical device which affects the page coordinate system used to place "
+ "graphic contents onto the canvas."
);
blockComposer.ShowBreak(breakSize);
blockComposer.ShowText(
"The following steps represent the operations applied to this page's CTM in order to alter it. "
+ "Each step writes the word \"Step\" at the lower-left corner of the current page frame:"
);
blockComposer.ShowBreak(breakSize);
for(int i = 0; i < steps.Length; i++)
{
composer.SetFillColor(colors[i]);
blockComposer.ShowText("Step " + i + ")");
composer.SetFillColor(
new colorSpaces::DeviceRGBColor(115 / 255d, 164 / 255d, 232 / 255d)
);
blockComposer.ShowText(" " + steps[i]);
blockComposer.ShowBreak(breakSize);
}
blockComposer.ShowText("Note that the approximation (" + maxCtmInversionApproximation + ") of the CTM components at step 4 is due to floating point precision limits; their exact values should be 1.0, 0.0, 0.0, 1.0, 0.0, 0.0.");
blockComposer.End();
composer.End();
}
private void BuildSteps(
PrimitiveComposer composer,
string[] steps,
colorSpaces::Color[] colors,
SizeF pageSize
)
{
composer.SetFont(ResourceName_DefaultFont,32);
RectangleF frame = new RectangleF(
0,
0,
pageSize.Width,
pageSize.Height
);
// Step 0.
{
colors[0] = new colorSpaces::DeviceRGBColor(30 / 255d, 10 / 255d, 0);
composer.SetFillColor(colors[0]);
composer.SetStrokeColor(colors[0]);
// Draw the page frame!
composer.DrawRectangle(frame);
composer.Stroke();
// Draw the lower-left corner mark!
composer.ShowText(
"Step 0",
new PointF(0,pageSize.Height),
XAlignmentEnum.Left,
YAlignmentEnum.Bottom,
0
);
steps[0] = GetStepNote(composer,"default");
}
// Step 1.
{
colors[1] = new colorSpaces::DeviceRGBColor(80 / 255d, 25 / 255d, 0);
composer.SetFillColor(colors[1]);
composer.SetStrokeColor(colors[1]);
// Transform the coordinate space, applying translation!
composer.Translate(72,72);
// Draw the page frame!
composer.DrawRectangle(frame);
composer.Stroke();
// Draw the lower-left corner mark!
composer.ShowText(
"Step 1",
new PointF(0,pageSize.Height),
XAlignmentEnum.Left,
YAlignmentEnum.Bottom,
0
);
steps[1] = GetStepNote(composer,"after translate(72,72)");
}
// Step 2.
{
colors[2] = new colorSpaces::DeviceRGBColor(130 / 255d, 45 / 255d, 0);
composer.SetFillColor(colors[2]);
composer.SetStrokeColor(colors[2]);
// Transform the coordinate space, applying clockwise rotation!
composer.Rotate(-20);
// Draw the page frame!
composer.DrawRectangle(frame);
composer.Stroke();
// Draw the coordinate space origin mark!
composer.ShowText("Origin 2");
// Draw the lower-left corner mark!
composer.ShowText(
"Step 2",
new PointF(0,pageSize.Height),
XAlignmentEnum.Left,
YAlignmentEnum.Bottom,
0
);
steps[2] = GetStepNote(composer,"after rotate(20)");
}
// Step 3.
{
colors[3] = new colorSpaces::DeviceRGBColor(180 / 255d, 60 / 255d, 0);
composer.SetFillColor(colors[3]);
composer.SetStrokeColor(colors[3]);
// Transform the coordinate space, applying translation and scaling!
composer.Translate(0,72);
composer.Scale(.5f,.5f);
// Draw the page frame!
composer.DrawRectangle(frame);
composer.Stroke();
// Draw the lower-left corner mark!
composer.ShowText(
"Step 3",
new PointF(0,pageSize.Height),
XAlignmentEnum.Left,
YAlignmentEnum.Bottom,
0
);
steps[3] = GetStepNote(composer,"after translate(0,72) and scale(.5,.5)");
}
// Step 4.
{
colors[4] = new colorSpaces::DeviceRGBColor(230 / 255d, 75 / 255d, 0);
composer.SetFillColor(colors[4]);
composer.SetStrokeColor(colors[4]);
// Transform the coordinate space, restoring its initial CTM!
composer.Add(
ModifyCTM.GetResetCTM(
composer.Scanner.State
)
);
// Draw the page frame!
composer.DrawRectangle(frame);
composer.Stroke();
// Draw the lower-left corner mark!
composer.ShowText(
"Step 4",
new PointF(0,pageSize.Height),
XAlignmentEnum.Left,
YAlignmentEnum.Bottom,
0
);
steps[4] = GetStepNote(composer,"after resetting CTM");
}
}
