David Smart
Demo touching the perimeter of a circle
Diff: main.cpp
- Revision:
- 2:3077639f94fa
- Parent:
- 1:e4f92c21e329
- Child:
- 3:d259be26795b
--- a/main.cpp Sun Apr 04 17:17:02 2021 +0000
+++ b/main.cpp Sun Apr 04 20:15:47 2021 +0000
@@ -64,6 +64,95 @@
const dim_t radius = 125;
const dim_t touch_tolerance = 30;
+
+//
+// Checkbox to turn on/off the touch-point
+//
+const rect_t check_tonoff = {400, 150, LCD_W-1, 182}; // Height based on double-size font
+const char * check_tonoff_msg = "[%c] Visible touchpoints";
+bool touchVisible = false; // default hidden
+
+
+//
+// Radio buttons to select between pie pieces
+// and a dial-indent
+//
+const rect_t radio_pie = {400, 250, LCD_W-1, 282};
+const char * radio_pie_msg = "(%c) Pie-slice rendering";
+const rect_t radio_dial = {400, 300, LCD_W-1, 332};
+const char * radio_dial_msg = "(%c) Dial rendering";
+int renderOption = 0; // pie-slice
+
+color_t edgeColor = BrightBlue;
+color_t fillColor = Black;
+
+void DrawCircle() {
+ // Draw a thickened circle
+ lcd.fillellipse(center.x, center.y, radius, radius, fillColor);
+ for (int r = 0; r <= 3; r++) {
+ lcd.ellipse(center.x, center.y, radius + r, radius + r, edgeColor);
+ }
+}
+
+void ShowUserControls() {
+ lcd.SetTextFontSize(2); // Bigger font; easier to touch
+ //
+ // [X] Enable visible touch-points
+ //
+ lcd.foreground(White);
+ lcd.SetTextCursor(check_tonoff.p1);
+ lcd.printf(check_tonoff_msg, (touchVisible) ? 'X' : ' ');
+ lcd.rect(check_tonoff, Gray);
+ //
+ // (*) Pie-slice rendering
+ // ( ) Dial rendering
+ //
+ lcd.foreground(White);
+ lcd.SetTextCursor(radio_pie.p1);
+ lcd.printf(radio_pie_msg, (renderOption == 0) ? '*' : ' ');
+ lcd.rect(radio_pie, Gray);
+ lcd.foreground(White);
+ lcd.SetTextCursor(radio_dial.p1);
+ lcd.printf(radio_dial_msg, (renderOption == 1) ? '*' : ' ');
+ lcd.rect(radio_dial, Gray);
+ lcd.SetTextFontSize();
+}
+
+void DrawInitialScreen() {
+ lcd.cls();
+ lcd.foreground(White); // Change to white
+ lcd.printf("RA8875 Touch Dial Example - Build " __DATE__ " " __TIME__ "\r\n");
+ lcd.printf("MBED v%d.%d.%d\r\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
+ ShowUserControls();
+ DrawCircle();
+}
+
+void TestToggleHit(point_t t) {
+ if (lcd.Intersect(check_tonoff, t)) {
+ touchVisible = !touchVisible;
+ DrawInitialScreen();
+ }
+}
+
+void TestRenderHit(point_t t) {
+ bool update = false;
+ if (lcd.Intersect(radio_pie, t)) {
+ renderOption = 0;
+ edgeColor = BrightBlue;
+ fillColor = Black;
+ update = true;
+ } else if (lcd.Intersect(radio_dial, t)) {
+ renderOption = 1;
+ edgeColor = BrightBlue;
+ fillColor = Gray;
+ update = true;
+ }
+ if (update) {
+ DrawInitialScreen();
+ }
+}
+
+
#define PI 3.14159265359f
// ---------------
@@ -123,22 +212,24 @@
lcd.init(LCD_W,LCD_H,LCD_C,BL_NORM);
lcd.TouchPanelInit();
- lcd.foreground(White); // Change to white
- lcd.printf("RA8875 Touch Dial Example - Build " __DATE__ " " __TIME__ "\r\n");
- lcd.printf("MBED v%d.%d.%d\r\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
-
- // Draw a thickened circle
- for (int r = 0; r <= 3; r++) {
- lcd.ellipse(center.x, center.y, radius + r, radius + r, BrightBlue);
- }
+ DrawInitialScreen();
while (1) {
TouchCode_t touched;
-
+ static point_t lastTouch = {LCD_W, LCD_H}; // Init off-screen for easy detection
touched = lcd.TouchPanelReadable();
if (touched) {
point_t Touch = lcd.TouchCoordinates();
+ if (touched == touch) { // Only "on-touch"
+ TestToggleHit(Touch);
+ TestRenderHit(Touch);
+ }
+
+ lcd.foreground(White);
+ lcd.SetTextCursor(LCD_W - 8 * 9, 0);
+ lcd.printf("(%3d,%3d)", Touch.x,Touch.y);
+
// If the touch is near the drawn circle (+/- 30 pixels),
// compute the angle to the touch from the center of the circle
if (abs(GetRadius(Touch, center) - radius) <= touch_tolerance) {
@@ -146,20 +237,37 @@
printf("Touch at (%4d,%4d) is %3d degrees from (%4d,%4d)\r\n",
Touch.x, Touch.y, angle, center.x, center.y);
- // Fill the circle using 6° pie slices up to the angle of the touch
- point_t lastP = ProjectPoint(center, 90, radius); // seed it at angle 0
- for (int a=6; a<=360; a+=6) {
- point_t p = ProjectPoint(center, 90 - a, radius);
- color_t fillColor = (a <= angle) ? Blue : Black;
- //if ((a <= angle)) { // show the triangle coordinates (only the fill)
- // printf(" (%3d,%3d), (%3d,%3d), (%3d,%3d)\r\n",
- // lastP.x,lastP.y, p.x,p.y, center.x,center.y);
- //}
- lcd.filltriangle(center, p, lastP, fillColor);
- lastP = p;
+ point_t lastP;
+ switch (renderOption) {
+ default:
+ case 0:
+ // Fill the circle using 6° pie slices up to the angle of the touch
+ lastP = ProjectPoint(center, 90, radius); // seed it at angle 0
+ for (int a=6; a<=360; a+=6) {
+ point_t p = ProjectPoint(center, 90 - a, radius);
+ color_t fillColor = (a <= angle) ? Blue : Black;
+ //if ((a <= angle)) { // show the triangle coordinates (only the fill)
+ // printf(" (%3d,%3d), (%3d,%3d), (%3d,%3d)\r\n",
+ // lastP.x,lastP.y, p.x,p.y, center.x,center.y);
+ //}
+ lcd.filltriangle(center, p, lastP, fillColor);
+ lastP = p;
+ }
+ lastTouch.x = LCD_W; // reset to untouched for a change to the dial
+ break;
+ case 1:
+ lastP = ProjectPoint(center, 90 - angle, 0.75 * radius);
+ if (lastTouch.x != LCD_W) {
+ lcd.fillellipse(lastTouch, radius/5,radius/5, fillColor);
+ }
+ lcd.fillellipse(lastP, radius/5,radius/5, Black);
+ lastTouch = lastP;
+ break;
}
// Show the touch point (note we're not erasing the old one)
- lcd.fillellipse(Touch.x, Touch.y, 5, 5, BrightRed);
+ if (touchVisible) {
+ lcd.fillellipse(Touch.x, Touch.y, 5, 5, BrightRed);
+ }
}
}
}