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118 lines
3.0 KiB
118 lines
3.0 KiB
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#include "Raster.h"
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namespace CELL
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{
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Raster::Raster( int w,int h,void* buffer )
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{
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_width = w;
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_height = h;
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_buffer = (Rgba*)buffer;
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}
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Raster::~Raster( void )
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{
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}
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void Raster::clear()
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{
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memset(_buffer,0,_width * _height * sizeof(Rgba));
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}
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void Raster::drawPoint( int x,int y, Rgba color,int ptSize )
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{
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switch(ptSize)
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{
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case 1:
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setPixel(x,y,color);
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break;
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case 2:
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setPixel(x + 0, y + 0,color);
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setPixel(x + 1, y + 0,color);
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setPixel(x + 0, y + 1,color);
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setPixel(x + 1, y + 1,color);
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break;
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case 3:
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setPixel(x - 1, y - 1,color);
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setPixel(x + 0, y - 1,color);
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setPixel(x + 1, y - 1,color);
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setPixel(x - 1, y + 0,color);
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setPixel(x + 0, y + 0,color);
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setPixel(x + 1, y + 0,color);
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setPixel(x - 1, y + 1,color);
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setPixel(x + 0, y + 1,color);
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setPixel(x + 1, y + 1,color);
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break;
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}
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}
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void Raster::drawLine( float2 pt1,float2 pt2,Rgba color1,Rgba color2 )
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{
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float xOffset = pt1.x - pt2.x;
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float yOffset = pt1.y - pt2.y;
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if (xOffset == 0 && yOffset == 0)
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{
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setPixel(pt1.x,pt1.y,color1);
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}
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if (fabs(xOffset) > fabs(yOffset))
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{
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float slope = yOffset / xOffset;
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float xMin;
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float xMax;
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if (pt1.x < pt2.x)
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{
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xMin = pt1.x;
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xMax = pt2.x;
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}
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else
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{
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xMin = pt2.x;
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xMax = pt1.x;
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}
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float lenth = xMax - xMin;
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for (float x = xMin; x <= xMax ; x += 1.0f)
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{
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float y = pt1.y + (x - pt1.x) * slope;
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float scaler = (x - xMin)/lenth;
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Rgba color = colorLerp(color1,color2,scaler);
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setPixel(x,y,color);
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}
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}
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else
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{
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float slope = xOffset / yOffset;
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float yMin;
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float yMax;
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if (pt1.y < pt2.y)
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{
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yMin = pt1.y;
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yMax = pt2.y;
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}
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else
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{
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yMin = pt2.y;
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yMax = pt1.y;
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}
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float lenth = yMax - yMin;
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for (float y = pt1.y; y <= pt2.y ; y += 1.0f)
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{
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float x = pt1.x + (y - pt1.y) * slope;
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float scaler = (y - yMin)/lenth;
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Rgba color = colorLerp(color1,color2,scaler);
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setPixel(pt2.x,y,color);
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}
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}
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}
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}
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