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114 lines
3.6 KiB
114 lines
3.6 KiB
2 years ago
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/***
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This example is intended to demonstrate the use of getPixel() versus
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getRawPixel() and the fast horizontal and vertical drawing routines
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in the GFXcanvas family of classes,
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When using the GFXcanvas* classes as the image buffer for a hardware driver,
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there is a need to get individual pixel color values at given physical
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coordinates. Rather than subclasses or client classes call getBuffer() and
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reinterpret the byte layout of the buffer, two methods are added to each of the
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GFXcanvas* classes that allow fetching of specific pixel values.
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* getPixel(x, y) : Gets the pixel color value at the rotated coordinates in
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the image.
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* getRawPixel(x,y) : Gets the pixel color value at the unrotated coordinates
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in the image. This is useful for getting the pixel value to map to a hardware
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pixel location. This method was made protected as only the hardware driver
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should be accessing it.
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The GFXcanvas*SerialDemo classes in this example will print to Serial the
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contents of the underlying GFXcanvas buffer in both the current rotated layout
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and the underlying physical layout.
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***/
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#include "GFXcanvasSerialDemo.h"
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#include <Arduino.h>
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void setup() {
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Serial.begin(115200);
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// first create a rectangular GFXcanvas8SerialDemo object and draw to it
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GFXcanvas8SerialDemo demo8(21, 11);
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demo8.fillScreen(0x00);
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demo8.setRotation(1); // now canvas is 11x21
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demo8.fillCircle(5, 10, 5, 0xAA);
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demo8.writeFastHLine(0, 0, 11, 0x11);
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demo8.writeFastHLine(10, 10, -11, 0x22);
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demo8.writeFastHLine(0, 20, 11, 0x33);
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demo8.writeFastVLine(0, 0, 21, 0x44);
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demo8.writeFastVLine(10, 20, -21, 0x55);
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Serial.println("Demonstrating GFXcanvas rotated and raw pixels.\n");
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// print it out rotated
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Serial.println("The canvas's content in the rotation of '0':\n");
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demo8.setRotation(0);
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demo8.print(true);
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Serial.println("\n");
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Serial.println("The canvas's content in the rotation of '1' (which is what "
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"it was drawn in):\n");
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demo8.setRotation(1);
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demo8.print(true);
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Serial.println("\n");
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Serial.println("The canvas's content in the rotation of '2':\n");
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demo8.setRotation(2);
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demo8.print(true);
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Serial.println("\n");
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Serial.println("The canvas's content in the rotation of '3':\n");
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demo8.setRotation(3);
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demo8.print(true);
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Serial.println("\n");
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// print it out unrotated
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Serial.println("The canvas's content in it's raw, physical layout:\n");
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demo8.print(false);
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Serial.println("\n");
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// Demonstrate GFXcanvas1SerialDemo
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GFXcanvas1SerialDemo demo1(21, 11);
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demo1.fillScreen(0);
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demo1.setRotation(0);
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demo1.writeFastHLine(0, 0, 9, 1);
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demo1.setRotation(1);
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demo1.writeFastHLine(0, 0, 9, 1);
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demo1.setRotation(2);
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demo1.writeFastHLine(0, 0, 9, 1);
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demo1.setRotation(3);
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demo1.writeFastHLine(0, 0, 9, 1);
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demo1.setRotation(1);
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demo1.fillRect(3, 8, 5, 5, 1);
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Serial.println("\nThe GFXcanvas1 raw content after drawing a fast horizontal "
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"line in each rotation:\n");
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demo1.print(false);
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Serial.println("\n");
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// Demonstrate GFXcanvas16SerialDemo
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GFXcanvas16SerialDemo demo16(21, 11);
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demo16.fillScreen(0);
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demo16.setRotation(0);
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demo16.writeFastHLine(0, 0, 9, 0x1111);
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demo16.setRotation(1);
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demo16.writeFastHLine(0, 0, 9, 0x2222);
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demo16.setRotation(2);
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demo16.writeFastHLine(0, 0, 9, 0x3333);
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demo16.setRotation(3);
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demo16.writeFastHLine(0, 0, 9, 0x4444);
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demo16.setRotation(1);
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demo16.fillRect(3, 8, 5, 5, 0x8888);
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Serial.println("\nThe GFXcanvas16 raw content after drawing a fast "
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"horizontal line in each rotation:\n");
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demo16.print(false);
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Serial.println("\n");
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}
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void loop() {}
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