void doIndexedColorDrawGraphics(CGContextRef context)
{
CGColorSpaceRef theBaseRGBSpace = getTheCalibratedRGBColorSpace();
CGColorSpaceRef theIndexedSpace = NULL;
unsigned char lookupTable[6];
float opaqueRed[] = { 0, 1 }; // index, alpha
float aBlue[] = { 1, 1 }; // index, alpha
// Set the first 3 values in the lookup table to a red of
// 169/255 = 0.663, no green, and blue = 8/255 = 0.031. This makes
// the first entry in the lookup table a shade of red.
lookupTable[0] = 169; lookupTable[1] = 0; lookupTable[2] = 8;
// Set the second 3 values in the lookup table to a red value
// of 123/255 = 0.482, a green value of 158/255 = 0.62, and
// a blue value of 222/255 = 0.871. This makes the second entry
// in the lookup table a shade of blue.
lookupTable[3] = 123; lookupTable[4] = 158; lookupTable[5] = 222;
// Create the indexed color space with this color lookup table,
// using the RGB color space as the base color space and a 2 element
// color lookup table to characterize the indexed color space.
theIndexedSpace = CGColorSpaceCreateIndexed(theBaseRGBSpace, 1, lookupTable);
if(theIndexedSpace != NULL){
CGContextSetStrokeColorSpace(context, theIndexedSpace);
CGContextSetFillColorSpace(context, theIndexedSpace);
// Release the color space this code created since it is no
// longer needed in this routine.
CGColorSpaceRelease(theIndexedSpace);
// Set the stroke color to an opaque blue.
CGContextSetStrokeColor(context, aBlue);
// Set the fill color to an opaque red.
CGContextSetFillColor(context, opaqueRed);
CGContextSetLineWidth(context, 8.);
// Draw the first rectangle.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(20., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
// Continue to use the stroke colorspace already set
// but change the stroke alpha value to a semitransparent value
// while leaving the index value unchanged.
aBlue[1] = 0.5;
CGContextSetStrokeColor(context, aBlue);
// Draw another rectangle to the right of the first one.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(140., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
}else
fprintf(stderr, "Couldn't make the indexed color space!\n");
}
static CGContextRef createScratchContext()
{
CGDataConsumerCallbacks callbacks = { putBytesNowhere, 0 };
RetainPtr<CGDataConsumerRef> consumer(AdoptCF, CGDataConsumerCreate(0, &callbacks));
CGContextRef context = CGPDFContextCreate(consumer.get(), 0, 0);
CGFloat black[4] = { 0, 0, 0, 1 };
CGContextSetFillColor(context, black);
CGContextSetStrokeColor(context, black);
return context;
}
void doColorSpaceFillAndStroke(CGContextRef context)
{
CGColorSpaceRef theColorSpace = getTheCalibratedRGBColorSpace();
float opaqueRed[] = { 0.663, 0.0, 0.031, 1.0 }; // red,green,blue,alpha
float aBlue[] = { 0.482, 0.62, 0.871, 1.0 }; // red,green,blue,alpha
// Set the fill color space to be the generic calibrated RGB color space.
CGContextSetFillColorSpace(context, theColorSpace);
// Set the fill color to opaque red. The number of elements in the
// array passed to this function must be the number of color
// components in the current fill color space plus 1 for alpha.
CGContextSetFillColor(context, opaqueRed);
// Set the stroke color space to be the generic calibrated RGB color space.
CGContextSetStrokeColorSpace(context, theColorSpace);
// Set the stroke color to opaque blue. The number of elements
// in the array passed to this function must be the number of color
// components in the current stroke color space plus 1 for alpha.
CGContextSetStrokeColor(context, aBlue);
CGContextSetLineWidth(context, 8.);
// Rectangle 1.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(20., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
// Continue to use the stroke colorspace already set
// but change the stroke alpha value to a semitransparent blue.
aBlue[3] = 0.5;
CGContextSetStrokeColor(context, aBlue);
// Rectangle 2.
CGContextBeginPath(context);
CGContextAddRect(context, CGRectMake(140., 20., 100., 100.));
CGContextDrawPath(context, kCGPathFillStroke);
// Don't release the color space since this routine
// didn't create it.
}
CGContextRef scratchContext()
{
static CGContextRef scratch = 0;
if (!scratch) {
CFMutableDataRef empty = CFDataCreateMutable(NULL, 0);
CGDataConsumerRef consumer = CGDataConsumerCreateWithCFData(empty);
scratch = CGPDFContextCreate(consumer, NULL, NULL);
CGDataConsumerRelease(consumer);
CFRelease(empty);
CGFloat black[4] = {0, 0, 0, 1};
CGContextSetFillColor(scratch, black);
CGContextSetStrokeColor(scratch, black);
}
return scratch;
}
void RSTileRendererDrawTile(
CGContextRef c,
CGRect bounds,
uint8_t *data,
uint32_t dataSize,
uint32_t zoom,
RSTileRendererGraphicsSpace graphicsSpace)
{
CGFloat width = (CGFloat)bounds.size.width;
CGFloat height = (CGFloat)bounds.size.height;
const CGFloat backgroundColor[4] = {0.5, 0.5, 0.5, 1};
const CGFloat fillColors[8][4] = {
{0, 0, 0, 0},
{(210 / 255.0), (173 / 255.0), (104 / 255.0), 1}, // Building = 1,
{(66 / 255.0), (66 / 255.0), (255 / 255.0), 1}, // HighwayMotorway = 2,
{(255 / 255.0), (66 / 255.0), (66 / 255.0), 1}, // HighwayPrimary = 3,
{(255 / 255.0), (155 / 255.0), (66 / 255.0), 1}, // HighwaySecondary = 4,
{(255 / 255.0), (255 / 255.0), (66 / 255.0), 1}, // HighwayTertiary = 5,
{(255 / 255.0), (255 / 255.0), (255 / 255.0), 1}, // HighwayResidential = 6,
{(255 / 255.0), (255 / 255.0), (255 / 255.0), 1} // HighwayService = 7,
};
const CGFloat strokeColors[8][4] = {
{0, 0, 0, 0},
{(140 / 255.0), (93 / 255.0), (33 / 255.0), 1}, // Building = 1,
{(44 / 255.0), (44 / 255.0), (200 / 255.0), 1}, // HighwayMotorway = 2,
{(200 / 255.0), (44 / 255.0), (44 / 255.0), 1}, // HighwayPrimary = 3,
{(200 / 255.0), (100 / 255.0), (44 / 255.0), 1}, // HighwaySecondary = 4,
{(200 / 255.0), (200 / 255.0), (44 / 255.0), 1}, // HighwayTertiary = 5,
{(200 / 255.0), (200 / 255.0), (200 / 255.0), 1}, // HighwayResidential = 6,
{(200 / 255.0), (200 / 255.0), (200 / 255.0), 1} // HighwayService = 7,
};
CGContextSetFillColor(c, backgroundColor);
CGContextFillRect(c, bounds);
uint32_t pos = 0;
uint32_t resolutionBits = 8;
double intToFloat = width / (1 << resolutionBits);
int32_t ix, iy;
double x, y, firstX, firstY;
while (pos < dataSize) {
ix = 0;
iy = 0;
RSTiledataThingType thingType = (RSTiledataThingType)RSVarintRead(data, &pos);
uint32_t numNodes = RSVarintRead(data, &pos);
for (uint32_t i = 0; i < numNodes; i++) {
ix += RSVarintSignedRead(data, &pos);
iy += RSVarintSignedRead(data, &pos);
x = intToFloat * ix;
y = intToFloat * iy;
if (graphicsSpace == RSTileRendererGraphicsSpaceQuadrantOne) {
y = height - y;
}
if (i == 0) {
firstX = x;
firstY = y;
CGContextMoveToPoint(c, x, y);
} else {
CGContextAddLineToPoint(c, x, y);
}
}
CGContextSetFillColor(c, fillColors[thingType]);
CGContextSetStrokeColor(c, strokeColors[thingType]);
switch (thingType) {
case RSTiledataBuilding:
CGContextSetLineWidth(c, 4);
break;
case RSTiledataHighwayMotorway:
case RSTiledataHighwayPrimary:
case RSTiledataHighwaySecondary:
case RSTiledataHighwayTertiary:
case RSTiledataHighwayResidential:
case RSTiledataHighwayService:
CGContextSetLineWidth(c, 12);
break;
}
if (RSTiledataThingTypeIsClosedWay(thingType)) {
CGContextAddLineToPoint(c, firstX, firstY);
CGContextDrawPath(c, kCGPathFillStroke);
} else {
CGContextStrokePath(c);
}
}
}
void CGContextSetStrokeColor_wrap(CGContext *con, float c1, float c2, float c3, float alpha) {
float color[4] = {c1, c2, c3, alpha};
CGContextSetStrokeColor(con, color);
}
